Weak pulse signal amplification circuit and tiny dust detector

Abstract

The invention relates to the technical field of amplifying circuits. The invention provides a weak pulse signal amplification circuit and a tiny dust detector. The circuit comprises an input capacitor, an impact sensor, a charge-sensitive pre-amplification sub-circuit and a charge-sensitive post-amplification sub-circuit. The input capacitor and the impact sensor are electrically connected with the input end of the charge-sensitive pre-amplification sub-circuit; the charge-sensitive post-amplification sub-circuit and the charge-sensitive pre-amplification sub-circuit are cascaded to form a charge-sensitive amplification sub-circuit; the amplification factor of the charge-sensitive amplification sub-circuit is multiplied; the signal amplification capability of the charge-sensitive amplification sub-circuit is improved; when the impact sensor is in an idle state, the input capacitor is utilized to test the adaptation of the charge-sensitive amplification sub-circuit and the impact sensor, and when the impact sensor is in a detection state, the input capacitor prevents the performance of outputting a weak charge pulse signal to the charge-sensitive amplification sub-circuit so as to prevent the input capacitor from generating signal interference on the impact sensor.

Description

technical field [0001] The invention relates to the technical field of amplifying circuits, in particular to a weak pulse signal amplifying circuit and a dust detector. Background technique [0002] Existing dust detectors usually include a weak pulse signal discharge circuit, see figure 1 , shows a weak pulse signal discharge circuit, including a shock sensor and a charge-sensitive preamplifier sub-circuit, the charge-sensitive preamplifier sub-circuit is directly electrically connected to the shock sensor, and the shock sensor is impacted by micron-sized solid particles at high speed (for brief Description, the micron-sized solid particles are called dust), generate a weak charge pulse signal, and output the weak charge pulse signal to the charge-sensitive preamplifier sub-circuit (for a brief description, the weak charge pulse signal output from the shock sensor is called is the first charge signal), the charge-sensitive preamplifier sub-circuit amplifies the first charg...

AI Technical Summary

Problems solved by technology

[0004] The invention aims at the problem that the weak pulse signal discharge circuit in the prior art limits the signal amplification ability due

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