Fast recovery circuit and fast recovery method

Abstract

The invention belongs to the technical field of electronic circuits, and provides a fast recovery circuit and a fast recovery method. The fast recovery circuit comprises an input circuit, a comparisoncircuit, a switching circuit and a control circuit, level signals are output to a capacitance feedback pre-amplifier through a first input electrode and a second input electrode in the input circuit;the comparison circuit performs logic processing on the level signal received in real time; a feedback signal is output to the control circuit; when the control circuit judges that the first input electrode or the second input electrode is converted into a connection state from a lead falling state according to the feedback signal; the switching circuit is controlled to be switched off after being switched on for a preset time, and the capacitance feedback pre-amplifier is short-circuited when the switching circuit is switched on, so that the output end of the capacitance feedback pre-amplifier recovers the state of the response level signal after a short time interval. Therefore, after the input electrode lead is disconnected and connected back, the whole circuit can rapidly recover to the normal working state, and the circuit structure is simple.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a fast recovery circuit and a fast recovery method. Background technique [0002] Electrophysiological signal detection generally uses electrodes to detect the potential difference between two different parts of the body surface, such as Electrocardiograph (ECG), Electroencephalogram (Electroencephalogram, EEG), Electromyography (Electro-MiGration, EMG), etc. However, during the detection process of this type of electrophysiological signal, the state of lead-off often occurs, so in many applications, the input terminal of the pre-amplifier is equipped with a lead-off detection circuit, but when the lead-off occurs, the input terminal of the pre-amplifier It is in a high level or low level state, so that the output of the preamplifier is also in a high level or low level instantaneously. In the same way, when the lead wires are reconnected, the voltage tra...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a fast recovery circuit and a fast recovery method, aiming at solving the problem that the output takes a very long time when the input voltage of the current stage amplifier changes instantaneously. In order to return to the normal voltage, resulting in the problem that the signal cannot be detected in time

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