Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1976-09-23
1978-09-05
Griffin, Robert L.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307257, H04B 126
Patent
active
041123743
ABSTRACT:
A circuit for mixing first and second rf signals to produce an output signal containing a beat frequency comprises a pair of switches each of which has a four diode bridge controlled by the first rf signal. The first rf signal is coupled to a balanced current divider with common mode signal rejection. Load resistors coupled to the bridges provide matched termination of the first rf signal irrespective of the conductive state of the bridges. The value of the resistors and the characteristic impedance of the drive circuit is related to the characteristics of the diodes utilized to maximize the dynamic range of the mixer. Circuitry is provided for coupling all diodes of each bridge in series with respect to the average dc component of the first rf signal and to properly terminate the average dc component. The two diode bridges are conductive and nonconductive in opposing half cycles of the first rf signal. A hybrid has its summing port coupled to the switch port of one bridge and its difference port coupled to the switch port of the other bridge. The second rf signal is coupled to input port of the hybrid which includes a balun for balancing and rejecting common mode signals from the second rf signal. The beat frequency is provided at the output port of the hybrid which also includes a balun for rejecting common mode signals. The desired and filtered frequency components of the second rf signal are properly terminated.
REFERENCES:
patent: 3264488 (1966-08-01), McGrogan, Jr.
patent: 3553584 (1971-01-01), Walsh, Jr.
patent: 3597633 (1971-08-01), Hirano et al.
patent: 3665508 (1972-05-01), Gawler
patent: 3935534 (1976-01-01), Lewis et al.
"Hybrid Microstrip Mixer & Circuits Constructed Therefrom" by Clouser, IBM Technical Disc. Bulletin, vol. 17, No. 6, p. 1571-1562, 11/1974.
Cannon, Jr. James J.
Griffin Robert L.
Ng Jin F.
Steinbrecher Corporation
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