Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1986-07-16
1988-02-23
Masinick, Michael A.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
455332, 455333, 332 43B, H04B 126
Patent
active
047275960
ABSTRACT:
A high performance, double-balanced mixer comprising a novel transformer and a pair of variable conductance semiconductor devices connected thereto which provides an output signal being the product of two input signals. Two transformer windings each include a center tap which together form one port of the mixer. Each variable conductance devices provides a selected conductivity path across the end of one of the center tapped windings to the beginning of the other center tapped winding. A second port signal provided oppositely modulates the variable conductance devices to provide a decrease in conductivity across one path while increasing the conductivity of the other path. The third winding of the transformer provides a third port to the mixer. A singularly-balanced mixer embodiment is shown. The mixer according to the present invention is operable to provide vastly improved linearity for either of two inputs as well as low noise and wide bandwidth operation.
REFERENCES:
patent: 3355678 (1967-11-01), Echarti
patent: 3636478 (1972-01-01), Glock
patent: 3829797 (1974-08-01), Karkar et al.
patent: 3925736 (1975-12-01), Lohrmann
patent: 4367560 (1983-01-01), Hallford
Mixers for High Performance Radio, Professional Program Session Record 24, Wescon 81, Electronic Show & Convention, Sep. 15-17, 1981, Brooks Hall & Civic Auditorium, Hilton, Hotel San Francisco, CA, Program, pp. 1-4.
Symmetric MOSFET Mixers of High Dynamic Range, R. P. Rafuse, Session XI, Circuit Techniques II, 1968 International Solid-State Circuits Conference, pp. 122 & 123.
Modeling and Simulation of Insulated-Gate Field-Effect Transistor Switching Circuits, H. Schichman and D. A. Hodges, IEEE J. Solid-State Circuits, vol. SC-3, Sep. 1968, pp. 285-289.
Termination Insensitive Mixers, Peter Will, Adams Russel, Anzac Division, one page.
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