Apparatus and method for controlling and measuring output power of transmitter

An apparatus for controlling output power of a transmitter having a power amplifier for generating a transmitted radio frequency signal, said apparatus comprising:

• sensing means coupled to said power amplifier for sensing said output power of said transmitter, said sensing means outputting a voltage level signal indicative of the sensed output power;
• a variable attenuator for generating an attenuated signal by attenuating said voltage level signal in response to an attenuation ratio control signal;
• a radio frequency amplifier for generating an amplified signal by amplifying said attenuated signal in response to an amplification ratio control signal;
• high power level measuring means responsive to said attenuated signal for generating first address data when said attenuated signal has a high power level;
• low power level measuring means responsive to said amplified signal for generating second address data when said amplified signal has a low power level;
• read only memory means having a table of correction data stored therein, said read only memory means outputting said correction data as measured output power data in response to one of said first address data and said second address data;
• voltage level adjusting means coupled to receive output power set data indicative of a desired output power level and said measured output power data, said voltage level adjusting means amplifying a voltage level of a radio frequency signal to be transmitted in response to a difference between said output power set data and said measured output power data.

An apparatus for controlling the output power of a transmitter, said apparatus comprising:

• high power level measuring means for generating first address data indicating that said output power of said transmitter has a high power level;
• low power level measuring means for generating second address data indicating that said output power of said transmitter has a low power level;
• non-volatile memory means having a table of correction data stored therein, said non-volatile memory means outputting said correction data as measured output power data in response to one of said first address data and said second address data;
• voltage level adjusting means coupled to receive output power set data indicative of a desired output power level and said measured output power data, said voltage level adjusting means amplifying a voltage level of a radio frequency signal to be transmitted in response to a difference between said output power set data and said measured output power data.

A method for controlling the output power of a transmitter, said method comprising the steps of:

• generating first address data indicating that said output power of said transmitter has a high power level;
• generating second address data indicating that said output power of said transmitter has a low power level;
• outputting correction data from a read only memory as measured output power data in response to one of said first address data and said second address data;
• inputting output power set data indicative of a desired output power level;
• and
• amplifying a voltage level of a radio frequency signal to be transmitted in response to a difference between said measured output power data and said output power set data.

A method for controlling the output power of a transmitter, said method comprising the steps of:

• sensing said output power of said transmitter and outputting a voltage level signal indicative of the sensed output power;
• generating an attenuated signal by attenuating said voltage level signal in response to an attenuation ratio control signal;
• comparing a maximum power level of said attenuated signal to a reference voltage;
• generating first address data in response to a result of said comparing step;
• outputting correction data from a read only memory as measured output power data in response to said first address data;
• inputting output power set data indicative of a desired output power level;
• and
• amplifying a voltage level of a radio frequency signal to be transmitted in response to a difference between said measured output power data and said output power set data.