Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1996-03-14
1998-06-16
Mullen, Thomas
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
330254, 455293, H04B 128
Patent
active
057687005
ABSTRACT:
A mixer contains a multiplier circuit that includes MOS transistors configured as a Gilbert multiplier cell without gain resistors such that a first and a second node are directly coupled to a folded cascode output stage. The mixer receives a differential radio frequency (RF) signal and a differential local oscillator (LO) signal, and it generates, at the first and second nodes, a differential intermediate frequency (IF) signal. The mixer further includes output and gain/filter stages coupled to the multiplier circuit. The output stage exhibits a low input impedance and a high output impedance, and it generates an output stage differential current approximately equal to the differential current of the IF differential signal. The gain/filter stage both controls conversion gain of the mixer, and it filters the high frequency components generated by said multiplier circuit. A capacitor, implemented as the gain/filter stage, and a folded-cascode circuit for the output stage are disclosed.
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Advanced Micro Devices , Inc.
Mullen Thomas
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