A Micropower Chopper - CDS Operational Amplifier

A micropower chopper-correlated double-sampling amplifier with 2µV standard deviation offset and 37nV/√Hz input noise density

A current noise reduction technique in chopper instrumentation amplifier for high-impedance sensors

A current noise reduction technique in chopper instrumentation amplifier (CIA) for high-impedance sensor is presented. The proposed technique is based on a time gating method to reduce time varying shot noise which is induced by channel charge injection of chopper switch transistors. An implemented CIA with the proposed time gating technique achieves more than 80-% noise reduction capability.

A 1 V Low-Noise CMOS Amplifier Using Autozeroing and Chopper Stabilization Technique

A low-noise CMOS amplifier operating at a low supply voltage is developed using the two noise reduction techniques of autozeroing and chopper stabilization. The proposed amplifier utilizes a feedback with virtual grounded input-switches and a multiple-output switched opamp. The low-noise amplifier fabricated in a 0.18-μm CMOS technology achieved 50-nV/ √ Hz input noise at 1-MHz chopping and 0.5...

Dynamic Offset Cancellation Techniques for Operational Amplifiers

At low frequencies, offset, 1/f noise and drift are the dominant error sources of operational amplifiers. This is especially true in CMOS technology. This chapter reviews precision techniques that can be used to achieve low 1/f noise and low offset in operational amplifiers. There are three types of CMOS offset cancellation techniques: trimming, chopping, and auto-zeroing. Trimming is usually p...

A 1V Supply Low Noise CMOS Amplifier Using Noise Reduction Technique of Autozeroing and Chopper Stabilization

A low-noise CMOS amplifier operating at a 1-V supply voltage is developed using the two noise reduction techniques of autozeroing and chopper stabilization. The proposed amplifier utilizes a feedback with virtual grounded input-switches and a multiple-output switched op-amp. The low-noise amplifier fabricated by a 0.18-μm CMOS technology was measured at a 1-V power supply, and achieved low nois...