Title:
TRIMMING CIRCUIT OF DIFFERENTIAL AMPLIFIER
Document Type and Number:
WIPO Patent Application WO/2020/258396
Kind Code:
A1
Abstract:
Disclosed is a trimming circuit of a differential amplifier (10), wherein an output end of the differential amplifier (10) is coupled to a first input end of the differential amplifier (10) by means of a first voltage-dividing resistor (11); a shift voltage is coupled to a second input end of the differential amplifier (10) by means of a second voltage-dividing resistor (12); the first voltage-dividing resistor (11) and the second voltage-dividing resistor (12) respectively form a T-shaped resistor network structure; and the T-shaped resistor network structure comprises: a k-bit resistive network connected to a T-shaped node and a reference power supply end, wherein n lower bits of the k-bit resistive network are an R-2R resistive network, some branches are each connected in series to at least one trimming resistor, and each trimming resistor is connected in parallel to a switch.
Inventors:
ZHANG JUN (CN)
ZHANG ZHIAN (CN)
ZHANG ZHIAN (CN)
Application Number:
PCT/CN2019/095863
Publication Date:
December 30, 2020
Filing Date:
July 12, 2019
Export Citation:
Assignee:
SHANGHAI ANALOGY SEMICONDUCTOR TECH LTD (CN)
International Classes:
H03F1/56; H03F1/08; H03F3/45
Foreign References:
| CN208351358U | 2019-01-08 | |||
| CN108551343A | 2018-09-18 | |||
| CN107786203A | 2018-03-09 | |||
| CN109586725A | 2019-04-05 | |||
| CN101330291A | 2008-12-24 | |||
| US20110163807A1 | 2011-07-07 |
Attorney, Agent or Firm:
XU & PARTNERS, LLC. (CN)
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