Patent ID: 6172563
Filing Date: 2001-01-09
Classification: H03F

Abstract:
An augmented lossless feedback transistor amplifier circuit for amplifying an input signal and producing a linearized output signal comprising:an input terminal for receiving an input signal;an output terminal for providing an output signal;a common-base transistor amplifier having an input, a control, and an output;an augmentation circuit having an input and an output, the input connected to the input of the common-base transistor amplifier and the output connected to the control of the common-base transistor amplifier, wherein the purpose of the augmentation circuit is to reduce the input impedance of the common-base transistor amplifier and to subsequently increase the linearity of the common-base transistor amplifier and in turn the linearity of the augmented lossless feedback amplifier; anda feedback transformer, having an input winding and a tapped output winding, the first end of the input winding connected to the signal input terminal of the augmented lossless feedback amplifier circuit, the second end of the input winding connected to the input of the common-base transistor amplifier and the input of the augmentation circuit, the first end of the output winding connected to the output of the common-base transistor amplifier, the second end of the output winding connected to signal ground, and the output winding tap connected to the signal output terminal of the augmented lossless feedback transistor amplifier circuit.