Abstract: An apparatus and method for adaptive biasing of a Doherty amplifier (102) is disclosed. The apparatus includes a carrier amplifier (210), a peaking amplifier (214), a carrier amplifier bias circuit (208) and a peaking amplifier bias circuit (212), all integrated onto a single chip. The method includes dividing an input signal into an in-phase signal and a quadrature phase signal. The method further includes sampling the input signal and applying the sampled signal to the biasing circuits. The method further includes adaptively biasing the carrier amplifier and the peaking amplifier by the output of the biasing circuits.

Abstract: An integrated LDMOS power detection circuit for radio frequency power detection is disclosed wherein the circuit includes a first LDMOS transistor, a first resistor coupled between the first LDMOS transistor and a power source, a second LDMOS transistor coupled to the first LDMOS transistor, a input resistive voltage divider and at least one PMOS transistors coupled between the second LDMOS transistor and a second resistor, wherein the PMOS transistor functions as a current mirror for the circuit and the first and the second resistors function as a indirect resistor divider for the circuit.