Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1993-06-28
1995-01-03
Kuntz, Curtis
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
455326, 455333, 327113, H04B 128, G06G 702
Patent
active
053794575
ABSTRACT:
In a conventional Gilbert-cell active mixer, two local oscillator matched pairs of transistors receive a local oscillator input signal and are coupled to a radio frequency matched pair of transistors which receive a radio frequency input signal. The circuit generates an intermodulated output signal at the collectors of the local oscillator matched pairs. Noise degradation is reduced over the conventional mixer by replacing the standard radio frequency emitter degeneration resistor with a reactive element, thereby reducing thermal noise. Narrow-band input matching is achieved by insertion of a series inductive element and optional parallel capacitive element in line with the radio frequency input. Thermal noise contributed to the circuit is thereby minimized while circuit linearity is preserved in the narrow frequency band of interest.
REFERENCES:
patent: 4080573 (1978-03-01), Howell
patent: 4268916 (1981-05-01), Kusakabe
patent: 4598256 (1986-07-01), Kinkel
patent: 4928314 (1990-05-01), Grandfield et al.
IEEE Journal of Solid State Circuits, "Si IC-Compatible Inductors and LC Passive Filters," Nhat M. Nguyen and Robert G. Mayer, vol. 25, No. 4, Aug. 1990.
1989 IEEE MTT-S Diget, "Silicon Bipolar Double Balanced Active Mixer MMIC's For RF and Microwave Applications Up to 6 GHZ," Jime Wholey, Issy Kipnis, Craig Snapp.
Communications Components-GaSa and Silicon Products, 1993 Databook, "IAM-81008 MagIC.TM. Silicon Bipolar MMIC 5 GHz Active Double Balanced Mixer/IF Amp", 8-35-8-38.
Hewlett--Packard Company
Kuntz Curtis
Wisler Mark D.
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