一种应用于TEC控制器的零漂运算放大器
By combining an alternating coupling structure of self-stabilizing zero and chopping techniques, the noise and offset problems of the TEC controller operational amplifier are eliminated, realizing a high-precision operational amplifier with low noise and low offset. This solves the shortcomings of traditional designs and has high bandwidth and high loop gain.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- DIOO MICROCIRCUITS CO LTD
- Filing Date
- 2025-11-14
- Publication Date
- 2026-07-17
AI Technical Summary
The operational amplifiers of existing TEC controllers have noise and offset problems, making it difficult to meet the requirements of high precision and low noise. Traditional designs cannot effectively eliminate low-frequency noise aliasing and residual offset.
By combining self-stabilizing zero technology and chopping technology, and through offset cancellation circuit and main amplifier circuit, an alternating coupling structure composed of fully differential operational amplifier, common-mode feedback operational amplifier and transmission gate is used to periodically alternate self-stabilizing zero and common-mode feedback. Combined with nested Miller compensation and fully differential Miller compensation, low noise and low offset are achieved.
It achieves an operational amplifier offset voltage as low as 1uV, a temperature drift as low as 10nV/℃, eliminates 1/f flicker noise in the low-frequency band, reduces noise in the high-frequency band, has extremely low output ripple, high bandwidth and high loop gain, and provides a phase margin of nearly 90°.
Smart Images
Figure CN121485608B_ABST