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Patent Searching and Data


Title:
OPERATIONAL AMPLIFIER AND CONTROL METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2019/196065
Kind Code:
A1
Abstract:
The present application provides an operational amplifier, characterized by comprising a first amplification stage, configured to generate a plurality of first output voltages according to a plurality of input voltages; a second amplification stage, configured to generate a plurality of second output voltages according to the plurality of first output voltages; a second output stage circuit, configured to copy a circuit identical or reduced at equal proportion to a first output stage circuit; a common-mode feedback circuit, configured to maintain an output common-mode voltage of the second output stage circuit at a preset value; a logic loop circuit, configured to adjust a difference value of the plurality of first output voltages of the first amplification stage when the operational amplifier is in direct current correction; and a bias circuit, configured to generate a voltage similar to a common-mode voltage of the plurality of first output voltages of the first amplification stage after the operational amplifier is turned on so as to serve as a reference voltage of a second common-mode feedback circuit. The operational amplifier provided by the present application has the advantages of reducing voltage surge and avoiding pop noise.

Inventors:
WANG WEN-CHI (CN)
NG SI HERNG (CN)
Application Number:
CN2018/082868
Publication Date:
October 17, 2019
Filing Date:
April 12, 2018
Export Citation:
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Assignee:
SHENZHEN GOODIX TECH CO LTD (CN)
International Classes:
H03F3/45
Foreign References:
CN101588157A2009-11-25
CN101933224A2010-12-29
CN104467704A2015-03-25
TW201044889A2010-12-16
Other References:
See also references of EP 3605840A4
Attorney, Agent or Firm:
SHANGHAI CHENHAO INTELLECTUAL PROPERTY LAW FIRM GENERAL PARTNERSHIP (CN)
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