Superheterodyne receiver apparatus

Details Superheterodyne receiver apparatus Superheterodyne receiver apparatus

1996-01-24

1998-01-20

Au, Amelia

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455318, 455304, H04B 106

Patent

active

057109974

ABSTRACT:
A receiver apparatus comprises a first local oscillator, a first pair of mixer circuits, a second local oscillator, a second pair of mixer circuits, an adding circuit, a bandpass filter and a modulation circuit. When the frequency of a second local oscillating circuit varies, a center frequency of the bandpass filter also varies in the same way so as to eliminate tracking errors. A large portion of a circuit for a double superheterodyne receiver can thus be incorporated in a single IC chip, the receiver may be made simpler, and cheaper, and differences in the absolute values of the capacitors and resistors due to variation in manufacturing processes can be eliminated.

REFERENCES:
patent: 4910800 (1990-03-01), Chung
patent: 4944025 (1990-07-01), Gehring et al.
patent: 5263194 (1993-11-01), Ragan
patent: 5428836 (1995-06-01), Sanecki et al.

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