Voice coil motor driving circuit and method thereof

Abstract

The invention discloses a voice coil motor driving circuit. According to the circuit, a digital logic circuit is connected with a first signal end and a second signal end respectively; an adjustable digital-to-analog converter is connected with the output end of the digital logic circuit and a first current source; the anode input end of an operational amplifier is connected with the output end ofthe adjustable digital-to-analog converter; the cathode input end of the operational amplifier is connected with the first output end of a voltage regulation and control circuit; the gate of a driving tube is connected with the output end of the operational amplifier; the drain of the driving tube is connected with the input end of an output signal end; the source of the driving tube is connectedwith the first end of a first resistor; the second output end of the voltage regulation and control circuit is connected with the second end of the first resistor; the first output end of the outputsignal end is connected with the input end of the second signal end; the second output end of the output signal end is connected with an external voice coil motor. According to the voice coil motor driving circuit and method thereof of the invention, the problem that a traditional amplifier has offset voltage is solved, and the offset voltage of an amplifier and the mismatch of a current source are adjusted and compensated through a digital circuit, so that the accuracy of driving current is effectively improved.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a voice coil motor driving circuit and a method thereof. Background technique [0002] The amplifier in the existing voice coil motor drive circuit has a phenomenon of voltage imbalance, which cannot accurately eliminate the offset voltage; the generated offset voltage has a great impact on the amplifier, and will affect the accuracy of each current source, and ultimately affect the accuracy of the driving current. Spend. Contents of the invention [0003] The object of the present invention is to provide a voice coil motor driving circuit and its method. The drive circuit and its method aim to solve the phenomenon of offset voltage in traditional amplifiers, and adjust and compensate the offset voltage and current source mismatch of the amplifier through a digital circuit to effectively improve the accuracy of drive current. [0004] To achieve the above object, ...

AI Technical Summary

Problems solved by technology

[0002] The amplifier in the existing voice coil motor drive circuit has a phenomenon of voltage imbalance, which cannot accurately eliminate the offset voltage; the generated offset voltage has a great impact on the amplifier, and will affect the accuracy of each current source, and ultimately affect the accuracy of the driving current. Spend

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