Bias voltage output circuit and drive circuit

Abstract

The invention provides a bias voltage output circuit and a driving circuit. The bias voltage output circuit comprises a bias voltage output module used for outputting bias voltage under the action ofa logic control module, and the bias voltage is used for driving an audio output device; a filter capacitor which is used for filtering noise generated by the bias voltage output module in the bias voltage output process and storing electric quantity in the bias voltage output process of the bias voltage output module; a discharging module which is used for discharging the electric quantity storedby the filter capacitor under the action of the logic control module; a logic control module which is used for outputting audio signals to an audio output device when determining that the audio output device accesses audio playing equipment, triggering the bias voltage output module to output the bias voltage, controlling the discharge module to forbid discharging the electric quantity stored bythe filter capacitor, triggering the bias voltage output module to stop outputting the bias voltage when determining that the audio output device is disconnected with the audio playing equipment, andcontrolling the discharge module to discharge the electric quantity stored by the filter capacitor.

Description

[0001] This application claims the priority of the Chinese patent application with the application number 201711329076.9 and the application name "A method and device for interface display" submitted to the China Patent Office on December 13, 2017, the entire contents of which are incorporated in this application by reference . technical field [0002] The present application relates to the field of communication technology, and in particular to a bias voltage output circuit and a driving circuit. Background technique [0003] In the process of rapid development, terminal equipment presents more and more functions. It has become a part of daily life for a user to use a terminal device to play an audio file or a video file. For example, a user can play an audio file and listen to it by plugging a headset into the headset jack of the terminal device. [0004] When the earphone is plugged and unplugged, the DC level of the terminal device will jump, thereby generating pop noi...

AI Technical Summary

Problems solved by technology

However, since the switch S1 directly contacts the headphone jack, the ESD can be directly hit on the switch S1 through the MICP, which will cause ESD and EOS problems of the MICBIAS chip

[0007] It can be seen that the problems of plosive sound, ESD and EOS during the plugging and unplugging process of the external audio output device cannot be solved simultaneously in the prior art

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