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Signal processing circuit

A signal processing circuit and circuit technology, applied in circuits, analog signal digital control, multiple input and output pulse circuits, etc., can solve problems such as discontinuous voltage and unstable signal processing

Pending Publication Date: 2022-03-29
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, by passing through the isolator, the reference voltages on the input side and output side of the isolator become discontinuous, and signal processing instability may occur.

Method used

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no. 1 approach

[0012] figure 1 It is a figure which shows the structure of the signal processing circuit of 1st Embodiment. This embodiment has an isolator 20 . The isolator 20 electrically insulates the input side from the output side. For example, with capacitive or inductive structures. A voltage setting circuit 5 is provided on the input side of the isolator 20 .

[0013] The voltage setting circuit 5 has a constant current source 100 . The constant current source 100 has constant current sources 101 and 102 . Constant current source 101 is connected to input terminal 1 via switch 110 . The constant current source 102 is connected to the input terminal 2 via the switch 111 . Constant current sources 101, 102 supply constant current I ref1 , I ref2 . The constant current source 101 outputs a constant current I to the ground side ref1 , the constant current source 102 will be the constant current I ref2 Output from the power supply Vd side to the input terminal 2 side. For exam...

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Abstract

According to one embodiment, a signal processing circuit includes: a first voltage setting circuit that sets a reference voltage on an input side of an isolator; the variable gain amplification circuit is used for amplifying an output signal of the isolator; a DC bias adjustment circuit for adjusting the bias of the variable gain amplification circuit; a second voltage setting circuit that sets a reference voltage on the output side of the isolator; and a control circuit that controls the DC bias adjustment circuit in response to a comparison result of an output voltage of the second voltage setting circuit and an output voltage of the variable gain amplification circuit.

Description

[0001] related application [0002] This application enjoys the benefit of the priority of Japanese patent application 2020-159321 filed on September 24, 2020, and the entire content of this Japanese patent application is incorporated in this application. technical field [0003] Embodiments generally relate to signal processing circuits. Background technique [0004] Conventionally, a signal processing circuit including an isolator has been disclosed. The isolator electrically insulates the input side from the output side. Therefore, for example, it is suitable for a signal processing circuit that performs signal processing by electrically insulating the high-voltage side and the low-voltage side. However, by passing through the isolator, the reference voltages on the input side and output side of the isolator become discontinuous, and signal processing may become unstable. A signal processing circuit that can perform stable signal processing while taking advantage of th...

Claims

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Application Information

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IPC IPC(8): G05F1/56
CPCG05F1/561H03K5/24H03F3/45475H03F2200/375H03F2203/45524H03G2201/103H03G3/30H03G3/001H03G1/0023H03G2201/40H01P1/36
Inventor 间岛秀明
Owner KK TOSHIBA
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