Patent ID: 8884696
Filing Date: 2014-11-11
Classification: H03F

Abstract:
1. A control circuit for controlling an operation of a power amplifier core switchable between an envelope tracking operation mode and a non-envelope tracking operation mode, wherein the control circuit is configured to at least one of provide a control signal for controlling the operation of the power amplifier core, and process an amplified signal received from the power amplifier core based on the operation mode of the power amplifier core, wherein the control circuit comprises at least one of the following: a switchable match circuit comprising an input configured to couple to an output of the power amplifier core, receive the amplified signal from the power amplifier core, wherein the switchable match circuit is configured to provide for the amplified signal a first load impedance in response to the envelope tracking operation mode and a second load impedance, different from the first load impedance, in response to the non-envelope tracking operation mode; a switchable bias circuit comprising a bias output configured to couple to a control input of the power amplifier core, wherein the switchable bias circuit is configured to provide at the bias output a first bias signal in response to the envelope tracking operation mode and a second bias signal, different from the first bias signal, in response to the non-envelope tracking operation mode; and a switchable supply circuit comprising a power amplifier supply terminal configured to couple to a supply input of the power amplifier core, wherein the switchable supply circuit is configured to provide at the power amplifier supply terminal a first decoupling capacitance for decoupling an envelope tracking supply signal received from a DCDC converter in response to the envelope tracking operation mode, and provide a second decoupling capacitance, different from the first decoupling capacitance, for decoupling a non-envelope tracking supply signal received from the DCDC converter in response to the non-envelope tracking operation mode.