Adaptive radio transceiver with a power amplifier

8 The amplifier of claim 7 wherein the transistor comprises a field effect transistor.

The amplifier of claim 8 wherein the transistor comprises a drain coupled to its respective current control input.

An amplifier, comprising:

• a plurality of amplifying stages each having first and second transistors, the first and second transistors each having first, second and third nodes, the first nodes of the first transistors being coupled together and the first nodes of the second transistors being coupled together to form a differential output, the second nodes of the first transistors being coupled together and the second nodes of the second transistors being coupled together to form a differential input, and the third node of each of the first transistors being coupled to the third node of its respective second transistor to form a current control input for each of the amplifying stages;
• and
• a current switch coupled to the current control input of one the amplifying stage to switch said one of the amplifying stages in or out of the amplifier.

An amplifier, comprising:

• a plurality of amplifying stages coupled together, each of the amplifying stages having a current control input;
• and
• a current switch coupled to the current control input of one of the amplifying stages to selectively switch said one of the amplifying stages in or out of the circuit.

49 The amplifier of claim 48 wherein the transistor comprises a field effect transistor.

The amplifier of claim 49 wherein the transistor comprises a drain coupled to its respective current control input.

An amplifier comprising a digitally programmable power level and a matching circuit which is substantially independent of the programmed power level.

72 The amplifier of claim 71 wherein the transistors each comprises a field effect transistor.

The amplifier of claim 72 wherein the transistors each comprises a drain coupled to its respective current control input.

87 The amplifier of claim 86 wherein the transistor comprises a field effect transistor.

The amplifier of claim 87 wherein the transistor comprises a drain coupled to said one of the amplifying stages.