The Experts below are selected from a list of 198 Experts worldwide ranked by ideXlab platform

L. Richard Carley - One of the best experts on this subject based on the ideXlab platform.

  • a low noise low offset capacitive sensing Amplifier for a 50 spl mu g spl radic hz monolithic cmos mems accelerometer
    IEEE Journal of Solid-state Circuits, 2004
    Co-Authors: Jiangfeng Wu, Gary K Fedder, L. Richard Carley
    Abstract:

    This paper describes a CMOS capacitive sensing Amplifier for a monolithic MEMS accelerometer fabricated by post-CMOS surface micromachining. This chopper Stabilized Amplifier employs capacitance matching with optimal transistor sizing to minimize sensor noise floor. Offsets due to sensor and circuit are reduced by ac offset calibration and dc offset cancellation based on a differential difference Amplifier (DDA). Low-duty-cycle periodic reset is used to establish robust dc bias at the sensing electrodes with low noise. This work shows that continuous-time voltage sensing can achieve lower noise than switched-capacitor charge integration for sensing ultra-small capacitance changes. A prototype accelerometer integrated with this circuit achieves 50-/spl mu/g//spl radic/Hz acceleration noise floor and 0.02-aF//spl radic/Hz capacitance noise floor while chopped at 1 MHz.

  • A low-noise low-offset capacitive sensing Amplifier for a 50-/spl mu/g//spl radic/Hz monolithic CMOS MEMS accelerometer
    IEEE Journal of Solid-State Circuits, 2004
    Co-Authors: Gary K Fedder, L. Richard Carley
    Abstract:

    This paper describes a CMOS capacitive sensing Amplifier for a monolithic MEMS accelerometer fabricated by post-CMOS surface micromachining. This chopper Stabilized Amplifier employs capacitance matching with optimal transistor sizing to minimize sensor noise floor. Offsets due to sensor and circuit are reduced by ac offset calibration and dc offset cancellation based on a differential difference Amplifier (DDA). Low-duty-cycle periodic reset is used to establish robust dc bias at the sensing electrodes with low noise. This work shows that continuous-time voltage sensing can achieve lower noise than switched-capacitor charge integration for sensing ultra-small capacitance changes. A prototype accelerometer integrated with this circuit achieves 50-/spl mu/g//spl radic/Hz acceleration noise floor and 0.02-aF//spl radic/Hz capacitance noise floor while chopped at 1 MHz.

  • a low noise low offset chopper Stabilized capacitive readout Amplifier for cmos mems accelerometers
    International Solid-State Circuits Conference, 2002
    Co-Authors: Gary K Fedder, L. Richard Carley
    Abstract:

    A CMOS chopper-Stabilized Amplifier with both DC and AC offset cancellation, for capacitive readout of motion in MEMS structures, achieves 40 nV//spl radic/HZ noise floor, 10 mV DC offset, and 40 dB sensor offset reduction. The Amplifier, integrated into a CMOS-MEMS accelerometer, achieves 50 /spl mu/g//spl radic/Hz noise floor.

Gary K Fedder - One of the best experts on this subject based on the ideXlab platform.

  • a low noise low offset capacitive sensing Amplifier for a 50 spl mu g spl radic hz monolithic cmos mems accelerometer
    IEEE Journal of Solid-state Circuits, 2004
    Co-Authors: Jiangfeng Wu, Gary K Fedder, L. Richard Carley
    Abstract:

    This paper describes a CMOS capacitive sensing Amplifier for a monolithic MEMS accelerometer fabricated by post-CMOS surface micromachining. This chopper Stabilized Amplifier employs capacitance matching with optimal transistor sizing to minimize sensor noise floor. Offsets due to sensor and circuit are reduced by ac offset calibration and dc offset cancellation based on a differential difference Amplifier (DDA). Low-duty-cycle periodic reset is used to establish robust dc bias at the sensing electrodes with low noise. This work shows that continuous-time voltage sensing can achieve lower noise than switched-capacitor charge integration for sensing ultra-small capacitance changes. A prototype accelerometer integrated with this circuit achieves 50-/spl mu/g//spl radic/Hz acceleration noise floor and 0.02-aF//spl radic/Hz capacitance noise floor while chopped at 1 MHz.

  • A low-noise low-offset capacitive sensing Amplifier for a 50-/spl mu/g//spl radic/Hz monolithic CMOS MEMS accelerometer
    IEEE Journal of Solid-State Circuits, 2004
    Co-Authors: Gary K Fedder, L. Richard Carley
    Abstract:

    This paper describes a CMOS capacitive sensing Amplifier for a monolithic MEMS accelerometer fabricated by post-CMOS surface micromachining. This chopper Stabilized Amplifier employs capacitance matching with optimal transistor sizing to minimize sensor noise floor. Offsets due to sensor and circuit are reduced by ac offset calibration and dc offset cancellation based on a differential difference Amplifier (DDA). Low-duty-cycle periodic reset is used to establish robust dc bias at the sensing electrodes with low noise. This work shows that continuous-time voltage sensing can achieve lower noise than switched-capacitor charge integration for sensing ultra-small capacitance changes. A prototype accelerometer integrated with this circuit achieves 50-/spl mu/g//spl radic/Hz acceleration noise floor and 0.02-aF//spl radic/Hz capacitance noise floor while chopped at 1 MHz.

  • a low noise low offset chopper Stabilized capacitive readout Amplifier for cmos mems accelerometers
    International Solid-State Circuits Conference, 2002
    Co-Authors: Gary K Fedder, L. Richard Carley
    Abstract:

    A CMOS chopper-Stabilized Amplifier with both DC and AC offset cancellation, for capacitive readout of motion in MEMS structures, achieves 40 nV//spl radic/HZ noise floor, 10 mV DC offset, and 40 dB sensor offset reduction. The Amplifier, integrated into a CMOS-MEMS accelerometer, achieves 50 /spl mu/g//spl radic/Hz noise floor.

Theodor W. Hänsch - One of the best experts on this subject based on the ideXlab platform.

  • Carrier‐envelope phase‐Stabilized Amplifier system
    Laser Physics Letters, 2006
    Co-Authors: Jens Rauschenberger, Takao Fuji, M. Hentschel, Aart-j. Verhoef, Thomas Udem, Christoph Gohle, Theodor W. Hänsch, Ferenc Krausz
    Abstract:

    We demonstrate a novel scheme for carrier-envelope (CE) phase stabilization of few-cycle laser pulses from a mode-locked oscillator. Our scheme utilizes a monolithic, collinear geometry which obviates the need for splitting the laser output, where a fraction is used for CE-phase control and the remainder used for experiment. Rather than using a microstructured fiber and frequency-doubling crystal to generate the beating signal needed for CE-phase locking, in our scheme self-phase modulation and difference-frequency generation occur simultaneously in a single periodically poled lithium niobate (PPLN) crystal and are used to generate equivalent signals. Direct phase-locking and recompression of the output is enabled because the PPLN crystal transmits the majority of the incident fundamental relatively unaffected. As a result, the output provides few-cycle pulses with an unprecedented degree of short- and long-term reproducibility of the electric field waveform. These unique features, along with the simplicity of the scheme make it perfectly suitable for use in seeding CE-phase Stabilized amplified laser systems. Results from a 3 kHz amplified Ti:sapphire system will be presented that validate our assertions.

  • carrier envelope phase Stabilized Amplifier system
    Laser Physics Letters, 2006
    Co-Authors: Jens Rauschenberger, Takao Fuji, M. Hentschel, Aart-j. Verhoef, Thomas Udem, Christoph Gohle, Theodor W. Hänsch, Ferenc Krausz
    Abstract:

    We demonstrate a novel scheme for carrier-envelope (CE) phase stabilization of few-cycle laser pulses from a mode-locked oscillator. Our scheme utilizes a monolithic, collinear geometry which obviates the need for splitting the laser output, where a fraction is used for CE-phase control and the remainder used for experiment. Rather than using a microstructured fiber and frequency-doubling crystal to generate the beating signal needed for CE-phase locking, in our scheme self-phase modulation and difference-frequency generation occur simultaneously in a single periodically poled lithium niobate (PPLN) crystal and are used to generate equivalent signals. Direct phase-locking and recompression of the output is enabled because the PPLN crystal transmits the majority of the incident fundamental relatively unaffected. As a result, the output provides few-cycle pulses with an unprecedented degree of short- and long-term reproducibility of the electric field waveform. These unique features, along with the simplicity of the scheme make it perfectly suitable for use in seeding CE-phase Stabilized amplified laser systems. Results from a 3 kHz amplified Ti:sapphire system will be presented that validate our assertions.

  • Carrier envelope phase noise in Stabilized Amplifier systems
    Optics letters, 2005
    Co-Authors: Christoph Gohle, Jens Rauschenberger, Takao Fuji, Thomas Udem, Ferenc Krausz, Alexander Apolonski, Theodor W. Hänsch
    Abstract:

    At present most laser systems for generating phase-Stabilized high-energy pulses are chirped pulse Amplifier systems that involve the selection and subsequent amplification of pulses from a phase-Stabilized seed oscillator. We investigate the effect of the picking process on the carrier envelope phase stability and how the phase noise of the picked pulse sequence can be estimated from the phase noise properties of the seed oscillator. All noise components from the original pulse train above the picking frequency are aliased into the picked pulse train and therefore cannot be neglected.

  • Carrier envelope phase noise in Stabilized Amplifier systems
    CLEO Europe. 2005 Conference on Lasers and Electro-Optics Europe 2005., 1
    Co-Authors: Christoph Gohle, Jens Rauschenberger, Takao Fuji, Ferenc Krausz, Th. Udem, Alexander Apolonski, Theodor W. Hänsch
    Abstract:

    Carrier envelope phase noise in femtosecond oscillators is analyzed with respect to the impact of high frequency phase fluctuations in such systems on chirped pulse Amplifier phase stability.

Ferenc Krausz - One of the best experts on this subject based on the ideXlab platform.

  • Carrier‐envelope phase‐Stabilized Amplifier system
    Laser Physics Letters, 2006
    Co-Authors: Jens Rauschenberger, Takao Fuji, M. Hentschel, Aart-j. Verhoef, Thomas Udem, Christoph Gohle, Theodor W. Hänsch, Ferenc Krausz
    Abstract:

    We demonstrate a novel scheme for carrier-envelope (CE) phase stabilization of few-cycle laser pulses from a mode-locked oscillator. Our scheme utilizes a monolithic, collinear geometry which obviates the need for splitting the laser output, where a fraction is used for CE-phase control and the remainder used for experiment. Rather than using a microstructured fiber and frequency-doubling crystal to generate the beating signal needed for CE-phase locking, in our scheme self-phase modulation and difference-frequency generation occur simultaneously in a single periodically poled lithium niobate (PPLN) crystal and are used to generate equivalent signals. Direct phase-locking and recompression of the output is enabled because the PPLN crystal transmits the majority of the incident fundamental relatively unaffected. As a result, the output provides few-cycle pulses with an unprecedented degree of short- and long-term reproducibility of the electric field waveform. These unique features, along with the simplicity of the scheme make it perfectly suitable for use in seeding CE-phase Stabilized amplified laser systems. Results from a 3 kHz amplified Ti:sapphire system will be presented that validate our assertions.

  • carrier envelope phase Stabilized Amplifier system
    Laser Physics Letters, 2006
    Co-Authors: Jens Rauschenberger, Takao Fuji, M. Hentschel, Aart-j. Verhoef, Thomas Udem, Christoph Gohle, Theodor W. Hänsch, Ferenc Krausz
    Abstract:

    We demonstrate a novel scheme for carrier-envelope (CE) phase stabilization of few-cycle laser pulses from a mode-locked oscillator. Our scheme utilizes a monolithic, collinear geometry which obviates the need for splitting the laser output, where a fraction is used for CE-phase control and the remainder used for experiment. Rather than using a microstructured fiber and frequency-doubling crystal to generate the beating signal needed for CE-phase locking, in our scheme self-phase modulation and difference-frequency generation occur simultaneously in a single periodically poled lithium niobate (PPLN) crystal and are used to generate equivalent signals. Direct phase-locking and recompression of the output is enabled because the PPLN crystal transmits the majority of the incident fundamental relatively unaffected. As a result, the output provides few-cycle pulses with an unprecedented degree of short- and long-term reproducibility of the electric field waveform. These unique features, along with the simplicity of the scheme make it perfectly suitable for use in seeding CE-phase Stabilized amplified laser systems. Results from a 3 kHz amplified Ti:sapphire system will be presented that validate our assertions.

  • Carrier envelope phase noise in Stabilized Amplifier systems
    Optics letters, 2005
    Co-Authors: Christoph Gohle, Jens Rauschenberger, Takao Fuji, Thomas Udem, Ferenc Krausz, Alexander Apolonski, Theodor W. Hänsch
    Abstract:

    At present most laser systems for generating phase-Stabilized high-energy pulses are chirped pulse Amplifier systems that involve the selection and subsequent amplification of pulses from a phase-Stabilized seed oscillator. We investigate the effect of the picking process on the carrier envelope phase stability and how the phase noise of the picked pulse sequence can be estimated from the phase noise properties of the seed oscillator. All noise components from the original pulse train above the picking frequency are aliased into the picked pulse train and therefore cannot be neglected.

  • Carrier envelope phase noise in Stabilized Amplifier systems
    CLEO Europe. 2005 Conference on Lasers and Electro-Optics Europe 2005., 1
    Co-Authors: Christoph Gohle, Jens Rauschenberger, Takao Fuji, Ferenc Krausz, Th. Udem, Alexander Apolonski, Theodor W. Hänsch
    Abstract:

    Carrier envelope phase noise in femtosecond oscillators is analyzed with respect to the impact of high frequency phase fluctuations in such systems on chirped pulse Amplifier phase stability.

Christoph Gohle - One of the best experts on this subject based on the ideXlab platform.

  • Carrier‐envelope phase‐Stabilized Amplifier system
    Laser Physics Letters, 2006
    Co-Authors: Jens Rauschenberger, Takao Fuji, M. Hentschel, Aart-j. Verhoef, Thomas Udem, Christoph Gohle, Theodor W. Hänsch, Ferenc Krausz
    Abstract:

    We demonstrate a novel scheme for carrier-envelope (CE) phase stabilization of few-cycle laser pulses from a mode-locked oscillator. Our scheme utilizes a monolithic, collinear geometry which obviates the need for splitting the laser output, where a fraction is used for CE-phase control and the remainder used for experiment. Rather than using a microstructured fiber and frequency-doubling crystal to generate the beating signal needed for CE-phase locking, in our scheme self-phase modulation and difference-frequency generation occur simultaneously in a single periodically poled lithium niobate (PPLN) crystal and are used to generate equivalent signals. Direct phase-locking and recompression of the output is enabled because the PPLN crystal transmits the majority of the incident fundamental relatively unaffected. As a result, the output provides few-cycle pulses with an unprecedented degree of short- and long-term reproducibility of the electric field waveform. These unique features, along with the simplicity of the scheme make it perfectly suitable for use in seeding CE-phase Stabilized amplified laser systems. Results from a 3 kHz amplified Ti:sapphire system will be presented that validate our assertions.

  • carrier envelope phase Stabilized Amplifier system
    Laser Physics Letters, 2006
    Co-Authors: Jens Rauschenberger, Takao Fuji, M. Hentschel, Aart-j. Verhoef, Thomas Udem, Christoph Gohle, Theodor W. Hänsch, Ferenc Krausz
    Abstract:

    We demonstrate a novel scheme for carrier-envelope (CE) phase stabilization of few-cycle laser pulses from a mode-locked oscillator. Our scheme utilizes a monolithic, collinear geometry which obviates the need for splitting the laser output, where a fraction is used for CE-phase control and the remainder used for experiment. Rather than using a microstructured fiber and frequency-doubling crystal to generate the beating signal needed for CE-phase locking, in our scheme self-phase modulation and difference-frequency generation occur simultaneously in a single periodically poled lithium niobate (PPLN) crystal and are used to generate equivalent signals. Direct phase-locking and recompression of the output is enabled because the PPLN crystal transmits the majority of the incident fundamental relatively unaffected. As a result, the output provides few-cycle pulses with an unprecedented degree of short- and long-term reproducibility of the electric field waveform. These unique features, along with the simplicity of the scheme make it perfectly suitable for use in seeding CE-phase Stabilized amplified laser systems. Results from a 3 kHz amplified Ti:sapphire system will be presented that validate our assertions.

  • Carrier envelope phase noise in Stabilized Amplifier systems
    Optics letters, 2005
    Co-Authors: Christoph Gohle, Jens Rauschenberger, Takao Fuji, Thomas Udem, Ferenc Krausz, Alexander Apolonski, Theodor W. Hänsch
    Abstract:

    At present most laser systems for generating phase-Stabilized high-energy pulses are chirped pulse Amplifier systems that involve the selection and subsequent amplification of pulses from a phase-Stabilized seed oscillator. We investigate the effect of the picking process on the carrier envelope phase stability and how the phase noise of the picked pulse sequence can be estimated from the phase noise properties of the seed oscillator. All noise components from the original pulse train above the picking frequency are aliased into the picked pulse train and therefore cannot be neglected.

  • Carrier envelope phase noise in Stabilized Amplifier systems
    CLEO Europe. 2005 Conference on Lasers and Electro-Optics Europe 2005., 1
    Co-Authors: Christoph Gohle, Jens Rauschenberger, Takao Fuji, Ferenc Krausz, Th. Udem, Alexander Apolonski, Theodor W. Hänsch
    Abstract:

    Carrier envelope phase noise in femtosecond oscillators is analyzed with respect to the impact of high frequency phase fluctuations in such systems on chirped pulse Amplifier phase stability.