초록 ▼

A transmission power control system and method is provided that controls the magnitude of transmission power in proportion to the distance between a base station and a mobile station. The transmission power control system provides the exact transmission power by compensating for an error between a r

A transmission power control system and method is provided that controls the magnitude of transmission power in proportion to the distance between a base station and a mobile station. The transmission power control system provides the exact transmission power by compensating for an error between a real gain and a gain controlled value according to the magnitude of the transmission power. The transmission power control system can be used, for example, in a mobile phone. The transmission power control system can include a transmission part, a mobile station modem, a power detector, a gain difference controlling part and a power amplifier controlling part. The transmission part outputs a transmission power signal in accordance with input signals. The power detector transforms the transmission power signal into a DC voltage. The mobile station modem outputs a first and second gain control values, respectively, based on the DC voltage. The gain difference controlling part generates a gain difference control signal and applies the gain difference control signal to the transmission part in accordance with the first gain control value and an attenuated signal. The power amplifier controlling part outputs a power amplifier gain control value to the transmission part in accordance with the DC voltage and the second gain control value.

대표청구항 ▼

[ What is claimed is:] [1.] A transmission power control system, comprising:a transmitter that receives a modulated signal and outputs a transmission power signal based on a gain difference control signal;a power detector that transforms said transmission power signal into a DC voltage;a mobile stat

[ What is claimed is:] [1.] A transmission power control system, comprising:a transmitter that receives a modulated signal and outputs a transmission power signal based on a gain difference control signal;a power detector that transforms said transmission power signal into a DC voltage;a mobile station modem that outputs a first, second, third and fourth gain control values, respectively, based on the DC voltage; anda gain difference controller that generates said gain difference control signal and applies said gain difference control signal to said transmitter in accordance with said first gain control value and an attenuated signal,wherein said gain difference controller comprises,an attenuator that attenuates said DC voltage based on said third gain control value and outputs said attenuated signal,a comparator that generates a difference between said first gain control value and said attenuated signal, andan adding circuit that generates said gain difference control signal by adding said difference and said fourth gain control value.