Transconductance operational amplifier circuit and filter circuit

A technology of transconductance operational amplification and operational amplifier, applied in amplifiers, amplifiers with semiconductor devices/discharge tubes, differential amplifiers, etc., can solve problems such as large resistance and capacitance values, incompatibility with CMOS technology, etc., and achieve low power consumption , Improve linearity and reduce power consumption

Active Publication Date: 2020-08-14
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional passive RC low-pass filter circuits require large resistor and capacitor values ​​and are not compatible with CMOS processes

Method used

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  • Transconductance operational amplifier circuit and filter circuit
  • Transconductance operational amplifier circuit and filter circuit
  • Transconductance operational amplifier circuit and filter circuit

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Embodiment Construction

[0039] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings, but it is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be covered by the present invention. within the scope of protection.

[0040] The invention provides a circuit structure in which OTA is a double-ended input and a single-ended output, such as figure 1 As shown, the circuit structure includes an input stage, an upper bias circuit, a lower bias circuit, a source degeneration structure, and an improved Wilson current mirror structure, wherein:

[0041] The input stage includes a fourth PMOS transistor M p4 , the fifth PMOS transistor M p5 , the sixth PMOS transistor M p6 , the seventh PMOS transistor M p7 , the eighth PMOS transistor M p8 , the ninth PMOS transistor M ...

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PUM

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Abstract

The invention discloses a transconductance operational amplifier circuit and a filter circuit, the transconductance operational amplifier circuit comprises an input stage, an upper bias circuit, a lower bias circuit, a source electrode degradation structure and an improved Wilson current mirror structure, and a low-pass filter circuit comprises five identical transconductance operational amplifiers and five identical capacitors. The low-pass filter circuit structure based on the transconductance operational amplifier structure provided by the invention has the characteristics of low power consumption, low noise and low harmonic distortion, and has a very wide application prospect. Due to the fact that the OTA structure with the small transconductance value is used for achieving the function of the resistor, the capacitance value of the filter circuit under the cut-off frequency of 250 Hz is compatible with the CMOS technology. The OTA structure provided by the invention combines the technologies of current segmentation, current cancellation and source degradation, reduces the transconductance of OTA, and improves the linearity of OTA. The OTA provided by the invention works in a weak inversion working area, so that the power consumption of the circuit is reduced.

Description

technical field [0001] The invention belongs to the field of circuit design, and relates to a transconductance operational amplifier circuit and a filter circuit. Background technique [0002] As the demand for portable biological signal detection devices becomes more prominent, the demand for SoC circuit structures with low power consumption is increasing day by day. At the same time, the analog front-end filter circuit used for biological signal detection plays an important role in filtering out-of-band signals and noise of the front-end amplifier circuit. [0003] Traditional passive RC low-pass filter circuits require large resistor and capacitor values ​​and are not compatible with CMOS processes. Therefore, a low-pass filter circuit with a low cut-off frequency can be realized with a small capacitance value by using an OTA with a small transconductance instead of a resistor. At the same time, compared with the circuit structure working in the saturation region, the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45H03F1/26H03F1/02
CPCH03F1/0205H03F1/26H03F3/45179
Inventor 高志强林博
Owner HARBIN INST OF TECH
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