Multi-Point Chopper Amplifier Offset Correction Without Ripple
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Solution Overview
Problem
Conventional chopper amplifiers face challenges in effectively reducing input offset voltage and low-frequency noise, which can result in output chopping ripple and require complex compensation paths, increasing power consumption and component count, while also being inefficient in low-power applications.
Innovation Solution
A chopper amplifier with multiple sensing points and a multi-point sensed offset correction circuit that generates an input offset compensation signal based on signal levels at various points along the signal path, injecting this signal to compensate for input offset voltage and suppress output chopping ripple, thereby avoiding the need for high-frequency feedforward compensation paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional chopper amplifiers use complex compensation paths to reduce input offset voltage and low-frequency noise, then the input offset voltage is reduced, but the device complexity and power consumption increase
Solution Approach 1:
The patent segments the signal path into multiple sensing points (first sensing point before the amplification circuit, second sensing point after the amplification circuit) to independently measure and compensate for offset voltage at different stages. This segmentation allows targeted compensation without requiring complex overall compensation paths, thereby reducing device complexity while maintaining input offset voltage reduction effectiveness.
2Measurement precision
If conventional chopper amplifiers use complex compensation paths to reduce low-frequency noise, then the low-frequency noise is reduced, but the power consumption increases
Solution Approach 1:
The multi-point sensed offset correction circuit automatically generates compensation signals by sensing the signal path at multiple points and injecting correction signals to reduce low-frequency noise. This self-service mechanism eliminates the need for external complex compensation paths and high-power consumption components, achieving low-frequency noise reduction while maintaining low power consumption.
3Measurement precision
If conventional chopper amplifiers use complex compensation paths, then input offset voltage compensation is achieved, but the component count increases
Solution Approach 1:
The multi-point sensed offset correction circuit performs multiple functions: it senses the signal path at multiple points, generates compensation signals, and injects correction signals all within a single integrated circuit block. This multi-functionality eliminates the need for separate compensation components and complex compensation paths, achieving input offset voltage compensation with minimal component count.
4Object-generated harmful factors
If conventional chopper amplifiers use high-frequency feedforward compensation paths, then output chopping ripple is reduced, but the device complexity and power consumption increase
Solution Approach 1:
The multi-point sensed offset correction circuit acts as an intermediary between the signal path and the compensation mechanism. It senses intermediate points in the signal path and generates compensation signals that are injected back into the system, effectively suppressing output chopping ripple without requiring complex high-frequency feedforward compensation paths.
Data Source
AI summary
Chopper amplifiers with multiple sensing points for correcting input offset are disclosed herein. In certain embodiments, a chopper amplifier includes chopper amplifier circuitry including an input chopping circuit, an amplification circuit, and an output chopping circuit electrically connected in a cascade along a signal path. The chopper amplifier further incudes a multi-point sensed offset correction circuit that generates an input offset compensation signal based on sensing a signal level of the signal path at multiple signal points. Furthermore, the multi-point sensed offset correction circuit injects the input offset compensation signal into the signal path to thereby compensate for input offset voltage of the amplification circuit while suppressing output chopping ripple from arising.