Patent ID: 7167693
Filing Date: 2007-01-23
Classification: H03F

Abstract:
1. A power amplifier, comprising: (a) an amplifier circuit disposed in a main signal path and configured to amplify an RF input signal disposed in a frequency band to generate an RF output signal; (b) a scanning receiver coupled to the main signal path and configured to monitor power on the signal path in a controlled portion of the frequency band; and (c) a control circuit disposed in a feed forward path and configured to generate a suppression signal that, when combined with the RF output signal, suppresses intermodulation distortion (IMD) products disposed in a selected portion of the frequency band, the control circuit configured to, in a first mode, control the scanning receiver to identify at least one active channel among a plurality of channels in the frequency band, and, in a second mode, to control the scanning receiver to monitor IMD products in the selected portion of the frequency band, wherein the selected portion of the frequency band is associated with the active channel(s) identified by the scanning receiver.