Class d power amplifier circuit with pop noise suppression
A noise suppression, power amplifier circuit technology, applied in amplifiers with semiconductor devices/discharge tubes, DC-coupled DC amplifiers, improved amplifiers to reduce noise effects, etc., to achieve the effect of suppressing POP noise
Active Publication Date: 2018-03-30
SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD +1
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Problems solved by technology
[0003] Since the audio input of the class D power amplifier circuit must work at the bias point to transmit the audio input, the two differential input terminals of the class D power amplifier circuit are connected with capacitors. The capacitors at the two differential input terminals of the Class D power amplifier circuit are charged to the bias point, but because the charging speeds of the capacitors at the two differential input terminals are different, the two differential input terminals will form a differential input and amplify the output to form POP noise. Similarly, consumer electronics In the early stage of power failure, the capacitors at the two differential input terminals have different discharge speeds, and the two differential input terminals will also form a differential input to form POP noise.
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[0020] The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific examples, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention .
[0021] see figure 1 , which discloses a preferred embodiment of the class D power amplifier circuit with POP noise suppression in the present invention, in this embodiment, the class D power amplifier circuit with POP noise suppression includes a class D switching amplifier circuit 100 and a POP noise suppression circuit 200 . The class D switching amplifying circuit 100 is used to process the input audio signal and send it to the speaker 300 for audio output. The POP noise suppression circuit 200 suppresses the POP noise generated by the class D switching amplifying circuit 100 during switching.
[0022] The class D switch amplifier circuit 100 h...
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The invention discloses a class D power amplifier circuit with POP noise suppression, comprising a first signal input circuit with a capacitor C1, a second signal input circuit with a capacitor C2, an amplification circuit, a PWM circuit, a drive circuit and a filter circuit. The delay circuit controls the drive circuit to turn off within a predetermined delay time to turn off the output of the drive circuit, and controls the first switch circuit and the second switch circuit to be turned on to charge the capacitor C1 and the capacitor C2 to the bias voltage; the delay circuit When the predetermined delay time is reached, the drive circuit is controlled to be turned on and the first switch circuit and the second switch circuit are controlled to be turned off; when the power is off, the delay circuit is reset to control the drive circuit to be turned off. Therefore, the Class D power amplifier circuit with POP noise suppression in the present invention can suppress the POP noise generated by the charging and discharging of the capacitor C1 and the capacitor C2 when the power is turned on or off.
Description
technical field [0001] The invention relates to the technical field of circuits, in particular to a Class D power amplifier circuit with POP noise suppression. Background technique [0002] The Class D power amplifier circuit is a switch-type power amplifier circuit. Its working principle is based on the PWM mode. The audio signal is compared with the sampling triangle wave, and the output is a PWM waveform whose pulse width is proportional to the amplitude of the audio signal. Then, the amplitude of the PWM waveform Amplify, and then restore the amplified PWM waveform to an amplified audio signal after filtering. Compared with linear power amplifier circuits, Class D power amplifier circuits have the characteristics of high efficiency and less heat generation, so Class D power amplifier circuits are widely used in consumer electronics such as smart TVs and smart phones. [0003] Since the audio input of the class D power amplifier circuit must work at the bias point to tra...
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IPC IPC(8): H03F1/26H03F3/217H03F3/45
Inventor 左事君杨孝骏滕谋艳
Owner SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD