A system (100, 200, 300, 400, 500, 600, 700, 800, 1400, 1500) for envelope tracking, comprising: a tunable matching network configured to couple to at least one filter and to a power amplifier that is configured to operate in an envelope tracking mode of operation over a transmit band; and a control component configured to detect a present set of operating conditions of the power amplifier if the power amplifier operates in the envelope tracking mode of operation, the present set of operating conditions of the power amplifier comprising at least one of a present operating frequency and a present temperature of the power amplifier; a feedback receiver configured to receive a radio frequency transmit signal output via the at least one filter; and an envelope tracking analysis component configured to determine at least one of an envelope tracking delay variation over frequency between an envelope of the radio frequency signal and a supply voltage for the power amplifier and a gain variation over frequency of the power amplifier based at least in part on an analysis of the RF transmit signal, wherein the control component is further configured to transmit a control signal to the tunable matching network to optimize the at least one of the envelope tracking delay variation over frequency between the envelope of the radio frequency signal and a supply voltage for the power amplifier and the gain variation over frequency of the power amplifier, wherein the control signal is sent in response to the detected present set of operating conditions, and wherein the control signal is based at least in part on the present set of operating conditions and said at least one of the envelope tracking delay variation and gain variation, wherein the tunable matching network is further configured to adjust an impedance of the tunable matching network in response to the control signal. a tunable matching network configured to couple to at least one filter and to a power amplifier that is configured to operate in an envelope tracking mode of operation over a transmit band; and a control component configured to detect a present set of operating conditions of the power amplifier if the power amplifier operates in the envelope tracking mode of operation, the present set of operating conditions of the power amplifier comprising at least one of a present operating frequency and a present temperature of the power amplifier; a feedback receiver configured to receive a radio frequency transmit signal output via the at least one filter; and an envelope tracking analysis component configured to determine at least one of an envelope tracking delay variation over frequency between an envelope of the radio frequency signal and a supply voltage for the power amplifier and a gain variation over frequency of the power amplifier based at least in part on an analysis of the RF transmit signal, wherein the control component is further configured to transmit a control signal to the tunable matching network to optimize the at least one of the envelope tracking delay variation over frequency between the envelope of the radio frequency signal and a supply voltage for the power amplifier and the gain variation over frequency of the power amplifier, wherein the control signal is sent in response to the detected present set of operating conditions, and wherein the control signal is based at least in part on the present set of operating conditions and said at least one of the envelope tracking delay variation and gain variation, wherein the tunable matching network is further configured to adjust an impedance of the tunable matching network in response to the control signal.