System and method for controlling transmitter output levels in a wireless communications device

In a wireless communications device, a method for controlling transmitter output levels, the method comprising:

• maintaining a table of transmit bias control values cross-referenced to transmitter output levels;
• selecting transmitter output levels;
• supplying a transmit bias control value from the table corresponding to a selected transmitter output level;
• measuring a resulting transmitter output level;
• creating an adjusted transmit bias control value in response to the measured resulting transmitter output level and a reference value;
• using a difference between the transmit bias control value and the corresponding adjusted transmit bias control value to create an error value;
• saving the error value;
• and,
• adding the error value to another transmit bias control value corresponding to another selected transmitter output level.

In a wireless communications device, a system for controlling transmitter output levels, the system comprising:

• a transmitter configured to accept an initial transmit bias control value and to supply a transmitter output level in response to the initial transmit bias control value;
• and,
• a gain control circuit comprising:
• a measuring circuit configured to accept the transmitter output level and to supply a transmitter output measurement,
• a calculator having an input to receive the transmitter output measurement and an input to receive a reference value, the calculator generating an error value based on the transmitter output measurement and the reference value,
• a table of initial transmit bias control values cross-referenced to transmitter output levels, the table configured to accept an initial transmitter output level selection and to supply the initial transmit bias control value in response to the initial transmitter output level selection, the table configured to accept another transmitter output level selection and to supply another transmit bias control value in response to the another transmitter output level selection, and,
• a compensator configured to accept the another transmit bias control value and the error value and to supply a compensated transmit bias control value based on the another transmitter bias control value and the error value.

In a wireless communication device, a method for controlling transmitter output power level, the method comprising:

• determining an error correction value required to adjust a first transmit bias control value to set a transmitter output level equal to a first selected transmitter output level corresponding to the first transmit bias control value;
• storing the error correction value in memory;
• and
• adding the error correction value to a second bias control value stored in memory corresponding to a second selected transmitter output level to generate a compensated bias control value.

A system for controlling transmitter output levels, the system comprising:

• a transmitter configured to transmit a signal at a transmitter output level in accordance with transmit bias control values;
• a calculator configured to determine an error correction value required to adjust a first transmit bias control value to set the transmitter output level equal to a first selected transmitter output level corresponding to the first transmit bias control value;
• a memory configured to store the error correction value;
• and
• a compensator configured to generate, in response to a selection of a second transmitter output level, a compensated transmit bias control value equal to a sum of a second bias control value stored in the memory and the error correction value.