Patent ID: 8031003
Filing Date: 2011-10-04
Classification: H03F

Abstract:
1. An RF power amplifier, comprising: a first field effect transistor: a second field effect transistor: an RF signal input; an input transformer connected to the RF signal input, the input transformer having respective balanced outputs connected to the first gate and the second gate; a broadband output transformer having a first balanced input connected to the first drain, and a second balanced input connected to the second drain, wherein the broadband output transformer has an input to output impedance ratio of 1:4, and further wherein at least some flux cancellation occurs within the broadband output transformer; and temperature compensating bias circuitry for providing a temperature compensated bias voltage to the first field effect transistor and the second field effect transistor for decreasing the bias voltage of the first field effect transistor and the second field effect transistor as transistor temperature increases, the temperature compensating bias circuitry comprising: