Patent ID: 7034620
Filing Date: 2006-04-25
Classification: H03F

Abstract:
1. An RF amplifier, comprising: an input receiving an RF input signal modulated with a substantially lower frequency modulation signal; an active amplifier device receiving and amplifying the input signal to provide an output, the active amplifier device having a power supply connection; and a bias circuit coupled between a DC power supply and the active amplifier device power supply connection, the bias circuit comprising an RF blocking inductance, a first set of decoupling capacitors coupled in a parallel configuration to a ground connection and configured between the DC power supply and the RF blocking inductance and having capacitances selected to provide a low impedance within a first lower frequency portion of the modulation signal frequency range, and a second set of one or more decoupling capacitors coupled to a ground connection and configured between the active device power supply connection and the RF blocking inductance and having capacitance selected to provide a low impedance within a second higher frequency portion of the modulation signal frequency range.