Title:
DIGITAL AUDIO POWER AMPLIFIER AND POWER AMPLIFIER LOOP
Document Type and Number:
WIPO Patent Application WO/2021/104119
Kind Code:
A1
Abstract:
Disclosed are a digital audio power amplifier and a power amplifier loop. The power amplifier loop comprises an operational amplifier U1, a capacitor C1, a power amplifier output stage, a resistor R1, a resistor R2 and a noise control unit, wherein an inverting input end of the operational amplifier U1 is respectively connected to one end of the capacitor C1, one end of the noise control unit and an output end of a preceding DAC current source; an output end of the operational amplifier U1 is respectively connected to a control end of the power amplifier output stage and the other end of the capacitor C1; an output end of the power amplifier output stage is successively grounded by means of the resistors R1, R2; the other end of the noise control unit is connected to a connection point between the resistors R1, R2; the resistance values of the resistors R1, R2 are set to satisfy R1/R2 = (N - 2)/2, where N > 2; the reference voltage of the operational amplifier U1 is equal to PVDD/N, with PVDD being a power supply voltage of the power amplifier output stage; and the noise control unit is a resistor module. The present application ensures the normal operation of the digital audio power amplifier.
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Inventors:
ZHOU JIANING (CN)
ZHANG HAIJUN (CN)
YAO WEI (CN)
DU LIMING (CN)
CHENG JIANTAO (CN)
SUN HONGJUN (CN)
ZHANG HAIJUN (CN)
YAO WEI (CN)
DU LIMING (CN)
CHENG JIANTAO (CN)
SUN HONGJUN (CN)
Application Number:
PCT/CN2020/129674
Publication Date:
June 03, 2021
Filing Date:
November 18, 2020
Export Citation:
Assignee:
SHANGHAI AWINIC TECHNOLOGY CO LTD (CN)
International Classes:
H03F3/20
Domestic Patent References:
| WO2019030518A1 | 2019-02-14 |
Foreign References:
| CN110868162A | 2020-03-06 | |||
| CN109068237A | 2018-12-21 | |||
| CN208754539U | 2019-04-16 | |||
| CN106255005A | 2016-12-21 | |||
| US20130099857A1 | 2013-04-25 |
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (CN)
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