Low noise mixer circuit having passive inductor elements

Details Low noise mixer circuit having passive inductor elements Low noise mixer circuit having passive inductor elements

1996-06-26

1999-03-16

Chin, Tommy P.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455326, 333132, 333100, 327113, H04B 128, H04B 116

Patent

active

058841547

ABSTRACT:
A mixer circuit is provided which incorporates inductive elements for low voltage applications. The circuit consists of a balanced amplifier and a switch composed of transistor pairs driven by a local oscillator signal for multiplying the signal to produce a circuit output signal having a predetermined intermediate frequency. Inductors are used to provide degenerative feedback in the balanced amplifier portion of the circuit. The inductors generate negligible noise and produce a negligible dc voltage drop. The transistors in the circuit are thereby maintained in saturation regions of operation as desired. In accordance with another aspect of the invention, an inductor or, alternatively, a parallel inductor-capacitor circuit, is used as a constant current source in conjunction with the input transistors in the balanced amplifier portion of the circuit.

REFERENCES:
patent: 4931746 (1990-06-01), Trankle et al.
patent: 5379457 (1995-01-01), Nguyen
patent: 5559457 (1996-09-01), Uda et al.
patent: 5563545 (1996-10-01), Scheinberg
patent: 5570056 (1996-10-01), Groe
patent: 5589791 (1996-12-01), Gilbert
patent: 5675392 (1997-10-01), Nayebi et al.
Gilbert, B. A Precise Four-Quadrant Multiplier with Subnanosecond Response', IEEE Journal of Solid-State Circuits, Dec. 1968, vol. SC-3, pp. 250-256.
Grebene, A. "Bipolar and MOS Analog Integrated Circuit Design", John Wiley & Sons, 1984, pp. 469-479.

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