Center-tapped coil-based tank circuit for a balanced mixer circu

Details Center-tapped coil-based tank circuit for a balanced mixer circu Center-tapped coil-based tank circuit for a balanced mixer circu

1990-06-13

1992-08-18

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455319, 455326, H04B 126

Patent

active

051407051

ABSTRACT:
An RF tank circuit includes a coil with a center tap, the RF tank circuit being for receving an input RF signal, and for providing a balanced mixer circuit by being arranged in one of: a) receiving a local signal through second and third capacitors at first and second coil ends, respectively, with the center tap grounded; and, b) receiving a local signal at the center tap. An impedance is connected between the first and second coil ends of the RF tank circuit, the impedance providing low impendance for a predetermined intermediate frequency signal, and high impedance for a predetermined high frequency signal and a local signal. A bias resistor is connected between a middle connecting point of the impedance and ground. The coil of the RF tank cicuit can be one of a primary and second winding of an isolation transformer, with a remaining one of the primary and secondary windings being connected to an RF signal source, the isolation transformer being for preventing a leakage of a local signal to the RF signal source.

REFERENCES:
patent: 2296103 (1942-09-01), Kimball
patent: 4080573 (1978-03-01), Howell
patent: 4339827 (1982-07-01), Torres et al.
patent: 4449245 (1984-05-01), Rabe
patent: 4541124 (1985-09-01), Lacour et al.
patent: 4955085 (1990-09-01), Woody
patent: 5034994 (1991-07-01), Muterspaugh et al.

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