Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1995-01-25
1998-10-20
Chin, Wellington
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
455330, 455333, 327355, 327359, H04B 0128
Patent
active
058261826
ABSTRACT:
A mixer includes a doubly-balanced mixer core, an RF input section coupled to the mixer core, and a biasing circuit coupled to the RF input section. The RF input section includes a first transistor coupled to a first input of the mixer core for supplying a first current thereto. The base of the first transistor is driven by an RF input current, as a result, the first current is responsive to the RF input current. The RF input section also includes a current mirror coupled to the first transistor, which mirrors the sum of the first current and the RF input current to produce a second current that is complementary to the first current for small variations of the RF input current. The current mirror is coupled to a second input of the mixer core to supply the second current thereto. A biasing circuit is coupled to the RF input section to establish a quiescent value of the first current. Padding resistor can also be used in the RF input section to provide a predetermined input impedance to the RF input current.
REFERENCES:
patent: 4344188 (1982-08-01), Tanabe et al.
patent: 4723110 (1988-02-01), Voorman
patent: 5043674 (1991-08-01), Bonaccio et al.
patent: 5107134 (1992-04-01), Itoh
patent: 5311086 (1994-05-01), Yamaji et al.
patent: 5379457 (1995-01-01), Nguyen
patent: 5495194 (1996-02-01), Sugawava
patent: 5497123 (1996-03-01), Main et al.
Kimura, A Biopolar Four-Quadrant Analog Quarter-Square Multiplier Consisting of Unbalanced Emitter-Coupled Pairs and Expansion of Its Input Ranges, IEEE Journal of Solid-State Circuits, vol. 29, No. 1, Jan. 1994.
Kimura, "Some Circuit Design Techniques Using Two Cross-Coupled, Emitter-Coupled Pairs", IEEE Transactions On Circuits and Systems 1: Fundamental Theory and Applications, vol. 41, No. 5, May 1994 pp. 411-423.
Brokaw, A. Paul, "A Simple Three-Terminal IC Bandgap Reference," IEEE Journal of Solid-State Circuits, vol. SC-9, No. 6, Dec. 1974 pp. 388-393.
Analog Devices Inc.
Chin Wellington
Sobutka Philip J.
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