Multichannel signal acquisition circuit and method capable of increasing response speed

Abstract

The invention discloses a multichannel signal acquisition circuit and method capable of increasing a response speed. The multichannel signal acquisition circuit comprises a processor and at least a signal source Ri, one end of the signal source Ri is grounded, the other end of the signal source Ri is connected with a pull-up resistor R4 and a filter capacitor C1 by virtue of a switch Ki and then is connected with an ADC port of the processor, on-off of the switch Ki is controlled by the processor, the ADC port is connected with triodes Q1 and Q2 which are of a push-pull structure by virtue ofa resistor R3, the triode Q1 is of a PNP type, the triode Q2 is of an NPN type, a resistor R5 is connected between a collector and a base of the triode Q1 in parallel, the base of the triode Q1 is connected with IO1 of the processor by virtue of a resistor R7, a resistor R6 is connected between a collector and a base of the triode Q2 in parallel, the base of the triode Q2 is connected with IO2 ofthe processor by virtue of a resistor R8, a fast signal acquisition method is set in the processor, and a pre-sampling process, a pre-charging and pre-discharging process and a resampling process areset in the fast signal acquisition method.

Description

technical field [0001] The invention relates to a multi-channel signal acquisition circuit and method for accelerating response speed, belonging to the field of signal detection. Background technique [0002] In the field of sensor detection, it is often necessary to collect multiple signals. In order to save costs and reduce the size of the circuit board, it is necessary to share the signal amplification circuit and the sample and hold circuit. But this leads to a disadvantage: the signal establishment time may be relatively long, which is longer than the signal acquisition time of the processor, which affects the accuracy of signal detection; at the same time, in order to filter out external interference, the signal amplification circuit and the sample and hold circuit will set filter capacitors, This further exacerbates the inaccuracy of signal detection. Contents of the invention [0003] In order to solve the above problems, the present invention provides a multi-cha...

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Problems solved by technology

But this leads to a disadvantage: the signal establishment time may be relatively long, which is longer than the signal acquisition time of the processor, which affects the accuracy of signal detection; at the same time, in order to filter out external interference, the signal amplification circuit and the sample and hold circuit will set filter capacitors, This further exacerbates the inaccuracy of signal detection

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