Cellular telephone

Abstract

A cellular telephone receives a first communication signal from a cell-site station and transmits a second communication signal to the cell-site station. The cellular telephone includes an antenna, a duplexer, a receiver, an encoder/decoder apparatus, an acoustic transducer, a transmitter and a controller. The receiver is connected to the antenna through the duplexer. The receiver converts the first communication signal into a voice signal code, and outputs a signal indicating an intensity of the first communication signal. The transmitter is connected to the encoder/decoder apparatus and to the antenna through the duplexer. The receiver converts the input voice code signal from the encoder/decoder apparatus into the second communication signal. The controller is connected to the receiver and the transmitter. The controller controls amplitude of the transmitter corresponding to said intensity of the first communication signal. The transmitter includes a variable amplitude amplifier and a power amplifier means, and the controller includes a central processing unit and a memory. The controller controls a gain of the variable amplitude amplifier and a bias condition of the power amplifier means according to a function stored in the memory.

1 - 7 . (canceled)  
   
   
       8 . A method of controlling a transmission power of a cellular telephone adapted to be used in a CDMA system, said method comprising the steps of: 
 receiving a first communication signal and a transmitting power control signal from a cell-site station by a receiver of the cellular telephone;    outputting a power control signal derived from the transmitting power control signal sent from the cell-site station;    inputting a data signal;    converting the input data signal into a second communication signal;    controlling a transmitter of the cellular telephone so that an open-loop power control is performed at first and then a closed-loop power control is performed according to the power control signal so as to control a transmission power to converge into a range required by said cell-site station, and    transmitting the second communication signal to the cell-site station by the transmitter;    wherein the transmitter includes a variable amplitude amplifier and a power amplifier, and a gain of the variable amplifier and a bias condition of the power amplifier are controlled so as to control the transmission power to change gradually based on a function defining a relation between bias data and gain data stored in a memory of the cellular phone.    
   
   
       9 . A method according to  claim 8 , 
 wherein said bias condition is nearly 60 percent of a bias condition maximum value when output intensity of said second communication signal is nearly up to −50 dB.    
   
   
       10 . A method according to  claim 8 , 
 wherein said bias condition increases gradually to a bias condition maximum value when output intensity of said second communication signal increases within the range of −50 dB to 0 dB.    
   
   
       11 . A method according to  claim 8 , further comprising the steps of: 
 supplying a pulse-width-controlled pulse so as to control said bias condition; and    smoothing said pulse.