The Experts below are selected from a list of 19923 Experts worldwide ranked by ideXlab platform
Shigeya Tanaka - One of the best experts on this subject based on the ideXlab platform.
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$\Delta \Sigma $ PLL Transmitter With a Loop-Bandwidth Calibration System
IEEE Journal of Solid-state Circuits, 2008Co-Authors: Yukinori Akamine, Manabu Kawabe, Takao Okazaki, Masumi Kasahara, Kazuaki Hori, Shigeya TanakaAbstract:We developed a DeltaSigma PLL transmitter with a linear charge pump and a new Loop-Bandwidth calibration system that can calibrate Loop Bandwidth accurately in a very short time. The calibration system uses a double integration technique that integrates the transient signal at the voltage-controlled oscillator output during the response to a step wave input to the divider. In our DeltaSigma PLL transmitter for GSM phones, the calibration system keeps the Loop Bandwidth within 2% and the calibration time is about 25 mus. To improve the GSM spectrum, we developed a charge pump that reduces a spike noise and the asymmetry of the charge and discharge characteristics. The phase error of modulation in the DeltaSigma PLL transmitter with the charge pump and calibration system was kept within 2 degrees rms, and after calibration the 400-kHz offset noise level of the spectrum mask was -64 dBc.
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delta sigma pll transmitter with a Loop Bandwidth calibration system
IEEE Journal of Solid-state Circuits, 2008Co-Authors: Yukinori Akamine, Manabu Kawabe, Takao Okazaki, Masumi Kasahara, Kazuaki Hori, Shigeya TanakaAbstract:We developed a DeltaSigma PLL transmitter with a linear charge pump and a new Loop-Bandwidth calibration system that can calibrate Loop Bandwidth accurately in a very short time. The calibration system uses a double integration technique that integrates the transient signal at the voltage-controlled oscillator output during the response to a step wave input to the divider. In our DeltaSigma PLL transmitter for GSM phones, the calibration system keeps the Loop Bandwidth within 2% and the calibration time is about 25 mus. To improve the GSM spectrum, we developed a charge pump that reduces a spike noise and the asymmetry of the charge and discharge characteristics. The phase error of modulation in the DeltaSigma PLL transmitter with the charge pump and calibration system was kept within 2 degrees rms, and after calibration the 400-kHz offset noise level of the spectrum mask was -64 dBc.
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a polar Loop transmitter with digital interface including a Loop Bandwidth calibration system
International Solid-State Circuits Conference, 2007Co-Authors: Yukinori Akamine, Shigeya Tanaka, M Kawabe, T Okazaki, Y Shima, Y Masahiko, M Yamamoto, R Takano, Y KimuraAbstract:An RFIC with digital interface for GSM/EDGE is presented. The architecture is a polar Loop transmitter and a direct conversion receiver. The transmitter draws 100mA in GSM and 130mA in EDGE modes. A Loop-Bandwidth calibration system that can keep the variation of the Loop Bandwidth to less than plusmn10% after a few microseconds calibration period is applied. The RFIC also contains a timing-control circuit to avoid having a zero PA output amplitude during the switching between GSM and EDGE
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ISSCC - A Polar Loop Transmitter with Digital Interface including a Loop-Bandwidth Calibration System
2007 IEEE International Solid-State Circuits Conference. Digest of Technical Papers, 2007Co-Authors: Yukinori Akamine, Shigeya Tanaka, M Kawabe, T Okazaki, Y Shima, Y Masahiko, M Yamamoto, R Takano, Y KimuraAbstract:An RFIC with digital interface for GSM/EDGE is presented. The architecture is a polar Loop transmitter and a direct conversion receiver. The transmitter draws 100mA in GSM and 130mA in EDGE modes. A Loop-Bandwidth calibration system that can keep the variation of the Loop Bandwidth to less than plusmn10% after a few microseconds calibration period is applied. The RFIC also contains a timing-control circuit to avoid having a zero PA output amplitude during the switching between GSM and EDGE
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A Loop-Bandwidth calibration system for fractional-N synthesizer and /spl Delta//spl Sigma/-PLL transmitter
ISSCC. 2005 IEEE International Digest of Technical Papers. Solid-State Circuits Conference 2005., 1Co-Authors: Yukinori Akamine, Kazuaki Hori, M Kawabe, T Okazaki, N. Tolson, M. Kasahara, Shigeya TanakaAbstract:A 0.25 /spl mu/m BiCMOS fractional-N PLL with Loop-Bandwidth calibration is implemented in 3.3/spl times/3.3mm/sup 2/. Using double-integration that integrates VCO output signal over the transient step response, the calibrated PLL achieves tuning accuracy of 2% with less than 2/spl deg/ rms phase error when used as a /spl Delta//spl Sigma/-PLL transmitter for GSM.
Yukinori Akamine - One of the best experts on this subject based on the ideXlab platform.
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$\Delta \Sigma $ PLL Transmitter With a Loop-Bandwidth Calibration System
IEEE Journal of Solid-state Circuits, 2008Co-Authors: Yukinori Akamine, Manabu Kawabe, Takao Okazaki, Masumi Kasahara, Kazuaki Hori, Shigeya TanakaAbstract:We developed a DeltaSigma PLL transmitter with a linear charge pump and a new Loop-Bandwidth calibration system that can calibrate Loop Bandwidth accurately in a very short time. The calibration system uses a double integration technique that integrates the transient signal at the voltage-controlled oscillator output during the response to a step wave input to the divider. In our DeltaSigma PLL transmitter for GSM phones, the calibration system keeps the Loop Bandwidth within 2% and the calibration time is about 25 mus. To improve the GSM spectrum, we developed a charge pump that reduces a spike noise and the asymmetry of the charge and discharge characteristics. The phase error of modulation in the DeltaSigma PLL transmitter with the charge pump and calibration system was kept within 2 degrees rms, and after calibration the 400-kHz offset noise level of the spectrum mask was -64 dBc.
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delta sigma pll transmitter with a Loop Bandwidth calibration system
IEEE Journal of Solid-state Circuits, 2008Co-Authors: Yukinori Akamine, Manabu Kawabe, Takao Okazaki, Masumi Kasahara, Kazuaki Hori, Shigeya TanakaAbstract:We developed a DeltaSigma PLL transmitter with a linear charge pump and a new Loop-Bandwidth calibration system that can calibrate Loop Bandwidth accurately in a very short time. The calibration system uses a double integration technique that integrates the transient signal at the voltage-controlled oscillator output during the response to a step wave input to the divider. In our DeltaSigma PLL transmitter for GSM phones, the calibration system keeps the Loop Bandwidth within 2% and the calibration time is about 25 mus. To improve the GSM spectrum, we developed a charge pump that reduces a spike noise and the asymmetry of the charge and discharge characteristics. The phase error of modulation in the DeltaSigma PLL transmitter with the charge pump and calibration system was kept within 2 degrees rms, and after calibration the 400-kHz offset noise level of the spectrum mask was -64 dBc.
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ΔΣ PLL Transmitter With a Loop-Bandwidth Calibration System.
IEEE Journal of Solid-state Circuits, 2008Co-Authors: Yukinori Akamine, Manabu Kawabe, Kazuyuki Hori, Takao Okazaki, Masumi Kasahara, Satoshi TanakaAbstract:We developed a PLL transmitter with a linear charge pump and a new Loop-Bandwidth calibration system that can calibrate Loop Bandwidth accurately in a very short time. The calibration system uses a double integration technique that integrates the transient signal at the voltage-controlled oscillator output during the response to a step wave input to the divider. In our PLL transmitter for GSM phones, the calibration system keeps the Loop Bandwidth within 2% and the calibration time is about 25 s. To improve the GSM spectrum, we developed a charge pump that reduces a spike noise and the asymmetry of the charge and discharge characteristics. The phase error of modulation in the PLL transmitter with the charge pump and calibration system was kept within 2 degrees rms, and after calibration the 400-kHz offset noise level of the spectrum mask was 64 dBc.
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AS PLL Transmitter With a Loop-Bandwidth Calibration System
IEEE Journal of Solid-state Circuits, 2008Co-Authors: Yukinori Akamine, Manabu Kawabe, Kazuyuki Hori, Takao Okazaki, Masumi Kasahara, Satoshi TanakaAbstract:We developed a AS PLL transmitter with a linear charge pump and a new Loop-Bandwidth calibration system that can calibrate Loop Bandwidth accurately in a very short time. The calibration system uses a double integration technique that integrates the transient signal at the voltage-controlled oscillator output during the response to a step wave input to the divider. In our ∇Σ PLL transmitter for GSM phones, the calibration system keeps the Loop Bandwidth within 2% and the calibration time is about 25 μs. To improve the GSM spectrum, we developed a charge pump that reduces a spike noise and the asymmetry of the charge and discharge characteristics. The phase error of modulation in the dE PLL transmitter with the charge pump and calibration system was kept within 2 degrees rms, and after calibration the 400-kHz offset noise level of the spectrum mask was -64 dBc.
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a polar Loop transmitter with digital interface including a Loop Bandwidth calibration system
International Solid-State Circuits Conference, 2007Co-Authors: Yukinori Akamine, Shigeya Tanaka, M Kawabe, T Okazaki, Y Shima, Y Masahiko, M Yamamoto, R Takano, Y KimuraAbstract:An RFIC with digital interface for GSM/EDGE is presented. The architecture is a polar Loop transmitter and a direct conversion receiver. The transmitter draws 100mA in GSM and 130mA in EDGE modes. A Loop-Bandwidth calibration system that can keep the variation of the Loop Bandwidth to less than plusmn10% after a few microseconds calibration period is applied. The RFIC also contains a timing-control circuit to avoid having a zero PA output amplitude during the switching between GSM and EDGE
Kazuaki Hori - One of the best experts on this subject based on the ideXlab platform.
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$\Delta \Sigma $ PLL Transmitter With a Loop-Bandwidth Calibration System
IEEE Journal of Solid-state Circuits, 2008Co-Authors: Yukinori Akamine, Manabu Kawabe, Takao Okazaki, Masumi Kasahara, Kazuaki Hori, Shigeya TanakaAbstract:We developed a DeltaSigma PLL transmitter with a linear charge pump and a new Loop-Bandwidth calibration system that can calibrate Loop Bandwidth accurately in a very short time. The calibration system uses a double integration technique that integrates the transient signal at the voltage-controlled oscillator output during the response to a step wave input to the divider. In our DeltaSigma PLL transmitter for GSM phones, the calibration system keeps the Loop Bandwidth within 2% and the calibration time is about 25 mus. To improve the GSM spectrum, we developed a charge pump that reduces a spike noise and the asymmetry of the charge and discharge characteristics. The phase error of modulation in the DeltaSigma PLL transmitter with the charge pump and calibration system was kept within 2 degrees rms, and after calibration the 400-kHz offset noise level of the spectrum mask was -64 dBc.
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delta sigma pll transmitter with a Loop Bandwidth calibration system
IEEE Journal of Solid-state Circuits, 2008Co-Authors: Yukinori Akamine, Manabu Kawabe, Takao Okazaki, Masumi Kasahara, Kazuaki Hori, Shigeya TanakaAbstract:We developed a DeltaSigma PLL transmitter with a linear charge pump and a new Loop-Bandwidth calibration system that can calibrate Loop Bandwidth accurately in a very short time. The calibration system uses a double integration technique that integrates the transient signal at the voltage-controlled oscillator output during the response to a step wave input to the divider. In our DeltaSigma PLL transmitter for GSM phones, the calibration system keeps the Loop Bandwidth within 2% and the calibration time is about 25 mus. To improve the GSM spectrum, we developed a charge pump that reduces a spike noise and the asymmetry of the charge and discharge characteristics. The phase error of modulation in the DeltaSigma PLL transmitter with the charge pump and calibration system was kept within 2 degrees rms, and after calibration the 400-kHz offset noise level of the spectrum mask was -64 dBc.
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A Loop-Bandwidth calibration system for fractional-N synthesizer and /spl Delta//spl Sigma/-PLL transmitter
ISSCC. 2005 IEEE International Digest of Technical Papers. Solid-State Circuits Conference 2005., 1Co-Authors: Yukinori Akamine, Kazuaki Hori, M Kawabe, T Okazaki, N. Tolson, M. Kasahara, Shigeya TanakaAbstract:A 0.25 /spl mu/m BiCMOS fractional-N PLL with Loop-Bandwidth calibration is implemented in 3.3/spl times/3.3mm/sup 2/. Using double-integration that integrates VCO output signal over the transient step response, the calibrated PLL achieves tuning accuracy of 2% with less than 2/spl deg/ rms phase error when used as a /spl Delta//spl Sigma/-PLL transmitter for GSM.
Hyunchol Shin - One of the best experts on this subject based on the ideXlab platform.
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a 1 9 3 8 ghz delta sigma fractional n pll frequency synthesizer with fast auto calibration of Loop Bandwidth and vco frequency
IEEE Journal of Solid-state Circuits, 2012Co-Authors: Jaewook Shin, Hyunchol ShinAbstract:A fast and high-precision all-digital automatic calibration circuit that is highly suited for ΔΣ fractional-N synthesizers is designed to achieve a constant Loop Bandwidth and fast lock time over an octave tuning range. A high-speed frequency-to-digital converter (FDC) measures VCO frequency on-chip with a sub-fREF frequency resolution of fREF/k in a time period of k·TREF. The on-chip detected VCO frequency is then used for calibrating the Loop Bandwidth and the VCO frequency. The Loop Bandwidth calibration circuit measures the VCO gain KVCO and uses it to precisely control the charge pump current, hence making the Loop Bandwidth constant. For the VCO frequency calibration, a minimum error code finding block significantly enhances the calibration accuracy by finding the truly closest code to the target frequency. Moreover, this method does not need to activate ΔΣ modulator to achieve sub- fREF calibration resolution, which makes this technique much accurate and faster than the conventional ones. A 1.9-3.8 GHz ΔΣ fractional-N synthesizer is implemented in 0.13 μm CMOS, demonstrating that the Loop Bandwidth calibration is completed in 1.1-6.0 μs with ±2% accuracy and the VCO frequency calibration is completed in 1.225-4.025 μs, all across the entire octave tuning range.
Masumi Kasahara - One of the best experts on this subject based on the ideXlab platform.
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$\Delta \Sigma $ PLL Transmitter With a Loop-Bandwidth Calibration System
IEEE Journal of Solid-state Circuits, 2008Co-Authors: Yukinori Akamine, Manabu Kawabe, Takao Okazaki, Masumi Kasahara, Kazuaki Hori, Shigeya TanakaAbstract:We developed a DeltaSigma PLL transmitter with a linear charge pump and a new Loop-Bandwidth calibration system that can calibrate Loop Bandwidth accurately in a very short time. The calibration system uses a double integration technique that integrates the transient signal at the voltage-controlled oscillator output during the response to a step wave input to the divider. In our DeltaSigma PLL transmitter for GSM phones, the calibration system keeps the Loop Bandwidth within 2% and the calibration time is about 25 mus. To improve the GSM spectrum, we developed a charge pump that reduces a spike noise and the asymmetry of the charge and discharge characteristics. The phase error of modulation in the DeltaSigma PLL transmitter with the charge pump and calibration system was kept within 2 degrees rms, and after calibration the 400-kHz offset noise level of the spectrum mask was -64 dBc.
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delta sigma pll transmitter with a Loop Bandwidth calibration system
IEEE Journal of Solid-state Circuits, 2008Co-Authors: Yukinori Akamine, Manabu Kawabe, Takao Okazaki, Masumi Kasahara, Kazuaki Hori, Shigeya TanakaAbstract:We developed a DeltaSigma PLL transmitter with a linear charge pump and a new Loop-Bandwidth calibration system that can calibrate Loop Bandwidth accurately in a very short time. The calibration system uses a double integration technique that integrates the transient signal at the voltage-controlled oscillator output during the response to a step wave input to the divider. In our DeltaSigma PLL transmitter for GSM phones, the calibration system keeps the Loop Bandwidth within 2% and the calibration time is about 25 mus. To improve the GSM spectrum, we developed a charge pump that reduces a spike noise and the asymmetry of the charge and discharge characteristics. The phase error of modulation in the DeltaSigma PLL transmitter with the charge pump and calibration system was kept within 2 degrees rms, and after calibration the 400-kHz offset noise level of the spectrum mask was -64 dBc.
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ΔΣ PLL Transmitter With a Loop-Bandwidth Calibration System.
IEEE Journal of Solid-state Circuits, 2008Co-Authors: Yukinori Akamine, Manabu Kawabe, Kazuyuki Hori, Takao Okazaki, Masumi Kasahara, Satoshi TanakaAbstract:We developed a PLL transmitter with a linear charge pump and a new Loop-Bandwidth calibration system that can calibrate Loop Bandwidth accurately in a very short time. The calibration system uses a double integration technique that integrates the transient signal at the voltage-controlled oscillator output during the response to a step wave input to the divider. In our PLL transmitter for GSM phones, the calibration system keeps the Loop Bandwidth within 2% and the calibration time is about 25 s. To improve the GSM spectrum, we developed a charge pump that reduces a spike noise and the asymmetry of the charge and discharge characteristics. The phase error of modulation in the PLL transmitter with the charge pump and calibration system was kept within 2 degrees rms, and after calibration the 400-kHz offset noise level of the spectrum mask was 64 dBc.
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AS PLL Transmitter With a Loop-Bandwidth Calibration System
IEEE Journal of Solid-state Circuits, 2008Co-Authors: Yukinori Akamine, Manabu Kawabe, Kazuyuki Hori, Takao Okazaki, Masumi Kasahara, Satoshi TanakaAbstract:We developed a AS PLL transmitter with a linear charge pump and a new Loop-Bandwidth calibration system that can calibrate Loop Bandwidth accurately in a very short time. The calibration system uses a double integration technique that integrates the transient signal at the voltage-controlled oscillator output during the response to a step wave input to the divider. In our ∇Σ PLL transmitter for GSM phones, the calibration system keeps the Loop Bandwidth within 2% and the calibration time is about 25 μs. To improve the GSM spectrum, we developed a charge pump that reduces a spike noise and the asymmetry of the charge and discharge characteristics. The phase error of modulation in the dE PLL transmitter with the charge pump and calibration system was kept within 2 degrees rms, and after calibration the 400-kHz offset noise level of the spectrum mask was -64 dBc.
