Title:
DIFFERENTIAL AMPLIFIER
Document Type and Number:
Japanese Patent JP2017046216
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a differential amplifier capable of reducing influences of input resistance mismatching of a CMRR property.SOLUTION: The present invention relates to a differential amplifier configured to differentially amplify a first input signal and a second input signal into a first output signal and a second output signal. The differential amplifier comprises: an in-phase signal detection part (block 5) for detecting an in-phase signal of the first input signal and the second input signal or an in-phase signal of the first output signal and the second output signal; a reference voltage generation part (block 6) for generating a reference voltage (signal 6) that becomes a reference of the in-phase signal; a first amplification part (block 3) which amplifies the first input signal into the first output signal with the in-phase signal defined as a reference; and a second amplification part (block 4) which amplifies the second input signal into the second output signal with the in-phase signal defined as a reference. The in-phase signal detection part includes: a first voltage dividing element R5 and a second voltage dividing element R6 that are connected between the first amplification part and the second amplification part; and a first output resistor R7 of which one end is connected to a connection node between the first voltage dividing element and the second voltage dividing element and the other end is connected to the reference voltage generation part.SELECTED DRAWING: Figure 2
Inventors:
FUJINO MICHIKO
MATSUOKA DAISUKE
MATSUOKA DAISUKE
Application Number:
JP2015167941A
Publication Date:
March 02, 2017
Filing Date:
August 27, 2015
Export Citation:
Assignee:
ASAHI KASEI DENSHI KK
International Classes:
H03F3/45
Domestic Patent References:
| JPH1051247A | 1998-02-20 | |||
| JP2005184221A | 2005-07-07 |
Attorney, Agent or Firm:
Longhua International Patent Service Corporation
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