Brian K Terry

US Patent:

55215459, May 28, 1996

Filed:

Oct 21, 1994

Appl. No.:

8/326909

Inventors:

Brian K. Terry - Parkland FL
Wei Tan - Lake Worth FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 128
G06G 702

US Classification:

327359

Abstract:

A collector-injector mixer circuit (100) has a first differential pair of transistors having first and second transistors (102, 104) whose emitters are connected to a common first emitter terminal (110), and a second differential pair of transistors having third and fourth transistors (106, 108) whose emitters are connected to a common second emitter terminal (112). The bases of the first and fourth transistors (102, 108) are coupled to a common first base terminal (114) and the bases of the second and third transistors (104, 106) are coupled to a common second base terminal (116) between which a mixing signal is applied. A third differential pair of transistors have fifth and sixth transistors (124, 126) wherein collector (130, 132) of the fifth transistor (124) and sixth transistor (126) receive an input signal, an emitter of the fifth and sixth transistors (124, 126) are coupled through resistors (146, 148) to ground, and bases of the fifth and sixth transistors are coupled to a reference current circuit (150).