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A Ripple Cancellation Loop for Capacitively Coupled Chopper Amplifiers

A chopper amplifier, ripple elimination technology, applied to amplifiers, amplifiers with semiconductor devices/discharge tubes, improved amplifiers to reduce noise effects, etc., can solve problems such as inability to accurately compensate chopper amplifiers

Active Publication Date: 2019-09-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the existence of the offset voltage of the integrator, the compensation current formed by the transconductance often cannot accurately compensate the offset of the chopper amplifier, and cannot form a good suppression effect on the output voltage ripple of the chopper amplifier

Method used

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  • A Ripple Cancellation Loop for Capacitively Coupled Chopper Amplifiers
  • A Ripple Cancellation Loop for Capacitively Coupled Chopper Amplifiers
  • A Ripple Cancellation Loop for Capacitively Coupled Chopper Amplifiers

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Embodiment Construction

[0032] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] like figure 1 As shown, the present invention is used for the ripple elimination loop of the capacitively coupled chopper amplifier, including: differential capacitance C s1 ~C s2 , Low frequency chopper CH l , Integrating capacitance C int1 ~C int2 , High frequency chopper CH h1 , Ping-Pong self-adjusting amplifier structure, filter capacitor C r , transconductance module Gm 5 ;in:

[0034] The ripple cancellation loop is first composed of a differential capacitor C s1 ~C s2 The output ripple voltage (output ripple voltage generated by the main amplifier offset output current is low-frequency chopper CH m After modulation to 20kHz, the Miller capacitor C m1 ~C m2 formed by the upper integral) into a square wave current, such as figur...

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Abstract

The invention discloses a ripple elimination loop for a capacitance coupled chopper amplifier. An output voltage ripple of a chopper amplifier is converted to an AC signal, the AC signal is modulated to a DC signal, the DC signal is integrated by an integral module to obtain an integral voltage, and the integral voltage is converted to a compensating current through a transconductance module to compensate the offset voltage of the chopper amplifier and suppress the output voltage ripple of the chopper amplifier. In addition, according to the ripple elimination loop disclosed by the invention, the offset voltage of the integral module can be greatly suppressed by using the combination of a high-frequency chopping technology and a Ping-Pong self-zeroing technology in the ripple elimination loop, and thus the accurate integral voltage can be obtained, the accurate compensating current can be formed to suppress the offset current of a main amplifier in the chopper amplifier, and a good effect of suppressing the output voltage ripple of the chopper amplifier can be achieved.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, and in particular relates to a ripple elimination loop for a capacitively coupled chopper amplifier. Background technique [0002] Amplification is a basic function in both analog and digital circuits. Signals often need to be amplified to drive post-stage loads, overcome post-stage noise or provide logic levels for digital circuits. Therefore, an analog amplifier is an essential building block in both analog and digital circuits. Amplifiers are also widely used in feedback systems. [0003] At present, chopping technology is widely used in analog amplifiers. Its function is to modulate the flicker noise and offset voltage of the amplifier to a higher frequency and filter it to reduce the noise and offset of the amplifier; the capacitor is due to its matching It has high precision and does not need to occupy additional quiescent current, so it is widely used in the feedback ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/26H03F3/393
Inventor 董阳涛赵梦恋吴晓波杨小林汤立汉
Owner ZHEJIANG UNIV
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