Mixer circuit and communication device using the same

Details Mixer circuit and communication device using the same Mixer circuit and communication device using the same

1998-05-04

2000-06-06

Bost, Dwayne D.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455333, 327113, 327116, 333218, H04B 126

Patent

active

060730021

ABSTRACT:
A mixer circuit (230) comprises a double balanced mixer (370) including a first pair of transistors (Q3, Q4) and a second pair of transistors (Q5, Q6) and a differential amplifier (330) including a pair of transistors (Q1, Q2) coupled to a first reference voltage (302). A coupling element (C3) is inserted between a common emitter node (391) of the first pair of transistors (Q3, Q4) of the double balanced mixer (370) and the output node of one of the pair of transistors (Q1) of the RF input stage (330), and a coupling element (C4) is inserted between a common emitter node (392) of the second pair of transistors (Q5, Q6) of the double balanced mixer (370) and the output node of the other pair of transistors (Q2) of the differential amplifier (330).

REFERENCES:
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patent: 5329189 (1994-07-01), Ushida et al.
patent: 5559457 (1996-09-01), Uda et al.
patent: 5630228 (1997-05-01), Mittel
patent: 5805987 (1998-09-01), Kamase
patent: 5901349 (1999-04-01), Guegnaud et al.
Motorola Linear And Interface Integrated Circuits, Series E, 1985, pp. i and 2-15, by Motorola, Inc.
Wireless Communications Products Data Book, "TQ9172 Active Frequency Mixer", by TriQuint Semiconductor, Inc.

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