Frequency converter circuit for cable modem tuner

Oscillators – Solid state active element oscillator – Transistors

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Details

331105, 331175, 331177V, 331179, 331181, 329306, 455318, H03B 104, H03B 512, H03D 700, H04B 128

Patent

active

061247669

ABSTRACT:
A local oscillation circuit in a frequency converter circuit includes a resonant circuit, and a differential amplifier circuit connected to the resonant circuit. The differential amplifier circuit includes two transistors constituting a differential stage. One end of the resonant circuit is connected to the base of one transistor via a capacitive element, and to the collector of the other transistor via a capacitive element. The other end of the resonant circuit is connected to only the base of the other transistor via a capacitive element. Accordingly, an unbalanced oscillate operation is performed in the local oscillation circuit, leading to reduction of the phase noise caused by decrease in an oscillation output due to the trap phenomenon, and an improvement in reception quality.

REFERENCES:
patent: 4492934 (1985-01-01), Sugimoto
patent: 5418500 (1995-05-01), Igarashi
patent: 5745013 (1998-04-01), Hohmann

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