Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1993-09-07
1995-06-27
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
455330, 455333, 333121, H04B 126, H01P 520
Patent
active
054288398
ABSTRACT:
A broad bandwidth double balanced mixer with all circuitry contained on a single MMIC die is disclosed using planar magic tee hybrids to greatly reduce component quantity and die area. The hybrids comprise a Lange coupler followed by a capacitor and a quarter-wavelength transmission line on the direct path, in conjunction with a half-wavelength transmission line on the coupled path. The hybrid is essentially a planar realization of a magic tee, producing two equal magnitude outputs that are substantially 180 degrees separated in phase, with the coupled input terminated in 50 ohms. The mixer topology is a ring configured diode quad with two magic tee's at the RF and LO ports and a Wilkinson power divider at the IF port.
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"Double-Arrow 180.degree. Hybrid Covers 1 to 18 GHz" by Krytar, Sunnyvale, Calif. from Microwave Journal, Mar. 1987.
Friesen Michael J.
Lowe Benny W.
Eisenzopf Reinhard J.
Gorrie Gregory J.
Motorola Inc.
Pham Chi H.
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