Patent ID: 6107885
Filing Date: 2000-08-22
Classification: H03F

Abstract:
A wide bandwidth radio frequency amplifier comprising:an unbalanced-to-balanced transformer having a RF amplifier input for coupling with a RF input signal and first and second low level signal outputs;a first cascode having a low level signal input coupled to said unbalanced-to-balanced transformer first low level output and a high level signal output;a second cascode having a low level signal input coupled to said unbalanced-to-balanced transformer second low level output and a high level signal output;said first cascode having first, second and third stages coupled in a cascode configuration with a voltage source means in parallel therewith providing predetermined voltage drops across said first, second and third stages with said first stage including said low level signal input, said second stage providing impedance matching between said first and said third stages, and said third stage including said high level signal output;said second cascode having first, second and third stages coupled in a cascode configuration with said voltage source means in parallel therewith providing predetermined voltage drops across said first, second and third stages of said second gain stage with said first stage including said low level signal input, said second stage providing impedance matching between said first and said third stages, and said third stage including said high level signal output; anda balanced-to-unbalanced transformer having a first input coupled to said first gain stage output and a second input coupled to said second gain stage output and a RF amplifier output for coupling with a RF output terminal.