초록 ▼

An amplifier circuit for providing an amplified signal in response to an input signal. The amplifier circuit includes an input network for applying the input signal to a selected at least one of a plurality of amplifier stages. An output network is provided for coupling the amplified signal from the

An amplifier circuit for providing an amplified signal in response to an input signal. The amplifier circuit includes an input network for applying the input signal to a selected at least one of a plurality of amplifier stages. An output network is provided for coupling the amplified signal from the selected at least one amplifier stage. The appropriate amplifier stage is selected by a control circuit in response to a desired power value of the amplified signal. By selectively activating only the amplifier stage(s) that are necessary to provide the desired level of output power, increased DC efficiency can be accomplished in applications that require an amplifier which operates linearly over a wide dynamic range.

대표청구항 ▼

[ We claim:] [1.] An amplifier circuit for providing an amplified signal in response to an input signal, said amplifier circuit comprising:a plurality of amplifier stages coupled in parallel for amplifying said input signal, each of said plurality of amplifier stages having an amplifier stage input

[ We claim:] [1.] An amplifier circuit for providing an amplified signal in response to an input signal, said amplifier circuit comprising:a plurality of amplifier stages coupled in parallel for amplifying said input signal, each of said plurality of amplifier stages having an amplifier stage input coupled to said input signal and an amplifier stage output for providing said amplified signal;a control circuit, coupled to each of said plurality of amplifier stages, for selecting at least one of said plurality of amplifier stages in response to a power level of said amplified signal;an input network having an input coupled to said input signal and a plurality of outputs, each output coupled to one of said amplifier stage inputs, said input network for providing said input signal to a selected at least one of said plurality of amplifier stages;an output network coupled to each of said amplifier stage outputs, for providing said amplified signal from said selected at least one of said plurality of amplifier stages at an output network output node; anda plurality of power matching networks, each of said plurality of power matching networks having a power matching input coupled to a respective one of said amplifier stage outputs and having a power matching output coupled to an output node, said plurality of power matching networks for providing said amplified signal at said output node.