OUTPUT POWER CONTROL CIRCUIT OF POWER AMPLIFIER

WIPO Patent Application WO/2015/101146

A1

An output power control circuit of a power amplifier connected to the power amplifier comprises a first operational amplifier (AMP0), a first PMOS transistor, and a current sampling module (102). A negative input end of the first operational amplifier (AMP0) receives a power control signal. A gate of the first PMOS transistor is connected to an output end of the first operational amplifier (AMP0), a source is connected to an external power supply, and a drain is grounded by means of a first voltage offloading network (104). A power supply end of the power amplifier is connected to the drain of the first PMOS transistor, an input end accesses a signal to be amplified and an output end amplifies a signal. The current sampling module (102) samples a current of the first PMOS transistor to form a sampled current, and provides a negative feedback signal to a positive input end of the first operational amplifier (AMP0) according to the sampled current, so that a total power of the power amplifier is unchanged. The technical solutions can maintain a total power of a power amplifier unchanged, so that a correspondence between a load impedance change and an output power is weakened and power control is more accurate.

ZHAO QIAN (CN)
ZHANG LIYANG (CN)
LONG HUA (CN)
CHENG ZHENJUAN (CN)
TANG DONGJIE (CN)

PCT/CN2014/093425

July 09, 2015

December 10, 2014

Click for automatic bibliography generation  

NATIONZ TECHNOLOGIES INC (CN)

G05F1/66

CN102243504A	2011-11-16
CN1677299A	2005-10-05
CN101661301A	2010-03-03
US7622902B1	2009-11-24
US7453244B1	2008-11-18

SHENZHEN REFINED INTELLECTUAL PROPERTY OFFICE (GENERAL PARTNERSHIP) (CN)
深圳市瑞方达知识产权事务所（普通合伙） (CN)

View/Download PDF      PDF Help

Previous Patent: POWER AMPLIFIER AND GAIN REDUCTION CIRCUIT THEREOF

Next Patent: MULTI-MODE MULTI-FREQUENCY POWER AMPLIFIER