Signal reading circuit

Abstract

The invention discloses a signal reading circuit, which comprises an amplifying circuit and a filtering circuit. The amplifying circuit comprises a single-carrier integrating circuit and a dual-carrier integrating circuit, the single-carrier integrating circuit and the dual-carrier integrating circuit are arranged in parallel, the input end of the single-carrier integrating circuit or the dual-carrier integrating circuit is connected with an input signal, and the output end of the same is connected with the input end of the filter circuit; the filter circuit comprises a low-pass filter, a high-pass filter, a band elimination filter and a band-pass filter, which are arranged in parallel, wherein the input ends of the low-pass filter, the high-pass filter, the band elimination filter and the band-pass filter are respectively connected with the output end of the single-carrier integrating circuit or the dual-carrier integrating circuit. According to the invention, the amplification circuit and the filter circuit are connected in series, and a plurality of signal adjusting ranges are realized by adjusting different circuit structures; wherein different circuit structures can be connected by rotating different switches to be closed; in addition, the flexibility is good and the parameter variable range is large.

Description

technical field [0001] The invention belongs to the technical field of detection circuits, in particular to a signal readout circuit. Background technique [0002] The capacitive acceleration sensor has a very small capacitance change. It is difficult to achieve the amplification effect of the general amplifier circuit, and it is easily affected by device performance, parasitic capacitance, or noise. There are defects in the function of a single circuit. In terms of filtering, there are digital filtering and switched capacitor filtering. Among them, digital filtering takes up too many software resources, while switched capacitor filtering circuits are noisy, have limited cut-off frequencies, and are expensive. The traditional signal readout circuit has the technical problems of low flexibility, low variable range of parameters and small change of output amplitude. Contents of the invention [0003] Aiming at the technical problems existing in the prior art, the present in...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the technical problems existing in the prior art, the present invention provides a signal readout circuit to solve the technical problems of the traditional signal readout circuit, such as low flexibility, low variable range of parameters, and small change in output amplitude

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