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Design of a 0.5 V Chopper-Stabilized Differential Difference Amplifier for Analog Signal Processing Applications.

Xinlan Fan1, Feifan Gao1, Pak Kwong Chan1

  • 1School of Electrical and Electronic Engineering (EEE), Nanyang Technological University, Singapore 639798, Singapore.

Sensors (Basel, Switzerland)
|December 23, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a low-voltage, low-power chopper-stabilized differential difference amplifier (DDA) ideal for analog signal processing. It achieves high gain and low noise using minimal power, making it suitable for portable devices.

Keywords:
analog signal processingchopper stabilizeddamping factordifferential difference amplifierfrequency compensationlow voltagesensor amplifier

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Area of Science:

  • Integrated Circuit Design
  • Analog Electronics
  • Low-Power Electronics

Background:

  • Differential Difference Amplifiers (DDAs) are crucial for analog signal processing.
  • Low-voltage and low-power operation is essential for modern portable and embedded systems.
  • Chopper stabilization is a key technique for mitigating low-frequency noise and offset in amplifiers.

Purpose of the Study:

  • To present a novel low-voltage, low-power chopper-stabilized DDA.
  • To demonstrate effective frequency compensation techniques for stability.
  • To highlight the DDA's suitability for analog signal processing applications.

Main Methods:

  • Design and fabrication of a three-stage DDA using 40 nm CMOS technology.
  • Implementation of feed-forward frequency compensation and a Type II compensator.
  • Utilization of chopper stabilization technique with a 5 kHz chopping frequency.

Main Results:

  • Achieved an open-loop gain of 89 dB at a 0.5 V supply voltage.
  • Consumed only 0.74 μW of power.
  • Exhibited a unity-gain bandwidth (UGB) of 170 kHz, phase margin (PM) of 63.98°, and common-mode rejection ratio (CMRR) of 100 dB.
  • Demonstrated low input noise (245 nV/√Hz at 1 kHz) and input-referred offset (0.26 mV).

Conclusions:

  • The proposed chopper-stabilized DDA offers excellent performance at ultra-low voltage and power.
  • The circuit effectively suppresses offset and 1/f noise.
  • This DDA provides a valuable trade-off between power, noise, and bandwidth for analog signal processing.