The Experts below are selected from a list of 7911 Experts worldwide ranked by ideXlab platform
S P Voinigescu - One of the best experts on this subject based on the ideXlab platform.
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a 2 4 hbox v _ rm pp 60 gb s cmos driver with digitally variable amplitude and pre emphasis control at multiple peaking frequencies
IEEE Journal of Solid-state Circuits, 2011Co-Authors: R A Aroca, Peter Schvan, S P VoinigescuAbstract:The design of a 60-Gb/s CMOS driver with input Signal retiming is analyzed theoretically and validated experimentally. The output stage employs a modified distributed amplifier (DA) architecture with summation of both low-pass and reactively coupled Bandpass Signal paths along a 50-Ω output transmission line. The DA features digital variable gain amplifier (DVGA) cells to achieve broadband waveshape control with adjustable pre-emphasis at three different peaking frequencies. Binary-weighted MOSFET gate-finger groupings are employed in a Gilbert-cell based DVGA topology to minimize bit-dependent output impedance and group delay variations. S -parameter measurements of the retimed driver show 54-dB gain, while the standalone DA exhibits approximately 10 dB of peaking control in each of the three frequency bands. Input and output return loss is better than -10 dB up to 60 GHz. The circuit operates from 1.2- and 2-V supplies and achieves a throughput efficiency of 12.2 mW/Gb/s. Equalization experiments at 40 Gb/s demonstrate compensation of various channel characteristics, including over 12 feet of cascaded coaxial cables with 21 dB loss at 20 GHz.
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a 2 4 vpp 60 gb s mm wave dac based cmos driver with adjustable amplitude and peaking frequency
Compound Semiconductor Integrated Circuit Symposium, 2010Co-Authors: R A Aroca, Peter Schvan, S P VoinigescuAbstract:A 60-Gb/s CMOS driver employing mm-wave DACs to achieve broadband waveshape control and pre-emphasis at different peaking frequencies is presented. It features a modified distributed amplifier (DA) architecture that achieves low-voltage and high- speed summation of both low-pass and reactively- coupled Bandpass Signal paths along an output transmission line. Using binary-weighted MOSFET gate fingers in Gilbert-cell based DACs, the circuit can supply variable output swing up to 1.2V peak-to-peak per side in a 50Ω load and independent digital pre- emphasis control at 25 GHz, 35 GHz and 45 GHz, respectively. S-parameter measurements of the entire retimed transmitter show 60dB of differential gain, while the standalone DA exhibits approximately 10 dB of peaking control in each of the three frequency bands. Input and output return loss is better than - 10 dB up to 60 GHz. The entire circuit, including the transimpedance-limiting-amplifier-retimer, operates from 1.2V and 2V supplies and achieves a throughput efficiency of 12.2 mW/Gb/s.
Jing Wen - One of the best experts on this subject based on the ideXlab platform.
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on sampling a subband of a Bandpass Signal by periodically nonuniform sampling
International Conference on Acoustics Speech and Signal Processing, 2005Co-Authors: Yumei Wen, Jing WenAbstract:Periodically nonuniform sampling (PNS) is employed to sample an interesting component over a subband in a bandlimited Signal exclusive of using a physical filter. By controlling the sampling clock and the interpolation algorithm with respected to the interesting component, the sampling and frequency selection can be implemented simultaneously. The sampling rate and order are considered to merely allow the successful reconstruction of the interesting component and the average sampling rate is desirable to be lower than that to sample the entire Signal. By analyzing the possible spectral aliasing cases in the selected band, it is found that the number of spectral replicas is at most 2 less than the maximum number in any subband of the Signal. In addition, through the analysis, it is found that whatever the support of the selected band is, the average sampling rate has a lower bound. The limitation is primarily determined by the bandwidth of the complete Signal.
J O Coleman - One of the best experts on this subject based on the ideXlab platform.
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nonuniformly offset polyphase synthesis of a Bandpass Signal from complex envelope samples
International Symposium on Circuits and Systems, 1999Co-Authors: D P Scholnik, J O ColemanAbstract:In this paper we consider the synthesis of a Bandpass Signal from complex-envelope samples using a polyphase conversion structure based on periodically nonuniform output samples. This approach provides the flexibility to independently choose the sampling rate and carrier frequency, overcoming the restrictions of reconstruction from uniformly spaced output samples. Key to the design of such a system is a particular equivalent filter with a piecewise-constant impulse response that determines both the actual implementation filters and system performance. The transition times of this impulse response are found to be periodically nonuniform, leading to a characterization of the corresponding frequency response. An example design using a previously unavailable carrier frequency is presented which requires fewer filter taps than the alternative, a higher-rate uniform system.
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periodically nonuniform Bandpass sampling as a tapped delay line filtering problem
International Conference on Acoustics Speech and Signal Processing, 1999Co-Authors: D P Scholnik, J O ColemanAbstract:We consider systems for demodulation/modulation which use periodically nonuniform sampling (of arbitrary order) of the Bandpass Signal to circumvent the carrier-frequency restrictions of uniform sampling. The design of a particular tapped-delay-line (demodulation) or piecewise-constant-impulse-response (modulation) equivalent filter determines both the actual implementation filters and system performance. The tap spacing of the former and the transition times of the latter are periodically nonuniform. Following a characterization of the equivalent filter response, the special case of second-order sampling is examined for insight into the choice of sampling offset. A set of example designs demonstrates that, while nonuniform sampling permits carrier frequencies not allowed with uniform sampling, the resulting system performance is limited by the choice of carrier frequency.
R A Aroca - One of the best experts on this subject based on the ideXlab platform.
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a 2 4 hbox v _ rm pp 60 gb s cmos driver with digitally variable amplitude and pre emphasis control at multiple peaking frequencies
IEEE Journal of Solid-state Circuits, 2011Co-Authors: R A Aroca, Peter Schvan, S P VoinigescuAbstract:The design of a 60-Gb/s CMOS driver with input Signal retiming is analyzed theoretically and validated experimentally. The output stage employs a modified distributed amplifier (DA) architecture with summation of both low-pass and reactively coupled Bandpass Signal paths along a 50-Ω output transmission line. The DA features digital variable gain amplifier (DVGA) cells to achieve broadband waveshape control with adjustable pre-emphasis at three different peaking frequencies. Binary-weighted MOSFET gate-finger groupings are employed in a Gilbert-cell based DVGA topology to minimize bit-dependent output impedance and group delay variations. S -parameter measurements of the retimed driver show 54-dB gain, while the standalone DA exhibits approximately 10 dB of peaking control in each of the three frequency bands. Input and output return loss is better than -10 dB up to 60 GHz. The circuit operates from 1.2- and 2-V supplies and achieves a throughput efficiency of 12.2 mW/Gb/s. Equalization experiments at 40 Gb/s demonstrate compensation of various channel characteristics, including over 12 feet of cascaded coaxial cables with 21 dB loss at 20 GHz.
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a 2 4 vpp 60 gb s mm wave dac based cmos driver with adjustable amplitude and peaking frequency
Compound Semiconductor Integrated Circuit Symposium, 2010Co-Authors: R A Aroca, Peter Schvan, S P VoinigescuAbstract:A 60-Gb/s CMOS driver employing mm-wave DACs to achieve broadband waveshape control and pre-emphasis at different peaking frequencies is presented. It features a modified distributed amplifier (DA) architecture that achieves low-voltage and high- speed summation of both low-pass and reactively- coupled Bandpass Signal paths along an output transmission line. Using binary-weighted MOSFET gate fingers in Gilbert-cell based DACs, the circuit can supply variable output swing up to 1.2V peak-to-peak per side in a 50Ω load and independent digital pre- emphasis control at 25 GHz, 35 GHz and 45 GHz, respectively. S-parameter measurements of the entire retimed transmitter show 60dB of differential gain, while the standalone DA exhibits approximately 10 dB of peaking control in each of the three frequency bands. Input and output return loss is better than - 10 dB up to 60 GHz. The entire circuit, including the transimpedance-limiting-amplifier-retimer, operates from 1.2V and 2V supplies and achieves a throughput efficiency of 12.2 mW/Gb/s.
Bernard Lacaze - One of the best experts on this subject based on the ideXlab platform.
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lowpass Bandpass Signal reconstruction and digital filtering from nonuniform samples
International Conference on Acoustics Speech and Signal Processing, 2015Co-Authors: David Bonacci, Bernard LacazeAbstract:This paper considers the problem of non uniform sampling in the case of finite energy functions and random processes, not necessarily approaching to zero as time goes to infinity. The proposed method allows to perform exact Signal reconstruction, spectral estimation or linear filtering directly from the non-uniform samples. The method can be applied to either lowpass, or Bandpass Signals.
