High-precision automatic power control circuit with temperature compensation

Abstract

The invention discloses a high-precision automatic power control circuit with temperature compensation. An input end of a voltage controlled attenuator is used as the input end of the automatic power control circuit, an output end of the voltage controlled attenuator is connected with the input end of a power amplifier, the output end of the power amplifier is connected with the input end of a coupler, one output end of the coupler is used as the output end of the automatic power control circuit, the other output end of the coupler is connected with the input end of a high-precision root-mean-square detector, the output end of the high-precision root-mean-square detector is connected with one input end of a low noise operational amplifier, the other input end of the low noise operational amplifier is connected with one end of a thermistor, the other end of the thermistor is connected with a reference voltage, and the output end of the low noise operational amplifier is connected with a control end of the voltage controlled attenuator to control the voltage controlled attenuator. The high-precision automatic power control circuit can automatically adjust the output power of the power amplifier and meanwhile automatically compensate the fluctuation of the output power at different temperatures so as to keep the stability of the output power.

Description

technical field [0001] The invention relates to an automatic power control circuit, in particular to a high-precision automatic power control circuit with temperature compensation. Background technique [0002] As an important module in the transmitter, the RF power amplifier's output performance has a great impact on the communication quality. Due to the high power consumption of the power amplifier, the temperature will rise after a period of operation, resulting in a decrease in output power and a certain amount of noise. fluctuations, seriously affecting system performance. Automatic power control technology is an effective means to achieve the stability of the output power of RF power amplifiers. However, the existing automatic power control circuits basically use single-chip integrated devices, which cannot achieve ultra-wideband and high dynamic power consistency. The accuracy is not high, the fluctuation is large, and at the same time, it is restricted by the temper...

AI Technical Summary

Problems solved by technology

[0002] As an important module in the transmitter, the RF power amplifier's output performance has a great impact on the communication quality. Due to the high power consumption of the power amplifier, the temperature will rise after a period of operation, resulting in a decrease in output power and a certain amount of noise. Fluctuations, seriously affecting system performance

Automatic power control technology is an effective means to achieve the stability of the output power of RF power amplifiers. However, the existing automatic power control circuits basically use single-chip integrated devices, which cannot achieve ultra-wideband and high dynamic power consistency. The accuracy is not high, the fluctuation is large, and at the same time, it is restricted by the temperature of its own working environment, and it is difficult to achieve stable power output at different temperatures

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