Patent ID: 6122532
Filing Date: 2000-09-19
Classification: H03F,H04B

Abstract:
An amplifier for amplifying AC signals in an operating frequency range, comprising:a first transistor having first, second and third terminals, the first terminal being coupled to an input signal source;a second transistor having first, second and third terminals, the first terminal being coupled to the first terminal of the first transistor for signals in the operating frequency range, the second terminal of the second transistor being coupled to the second terminal of the first transistor for signals in the operating frequency range;a first bias voltage generator circuit coupled to the first terminal of the first transistor, the first bias voltage generator circuit being operable to provide a first bias voltage to the first terminal of the first transistor;a second bias voltage generator circuit coupled to the first terminal of the second transistor, the second bias voltage generator circuit being operable to provide a second bias voltage to the first terminal of the second transistor; andan impedance connected between the third terminal of the second transistor and the second terminal of the first transistor, the impedance being operable to conduct a bias current;wherein the first and second transistors are each operable to conduct a varying current in response to an input signal from the input signal source.