Low power RF receiver

Details Low power RF receiver Low power RF receiver

1991-07-29

1993-03-09

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

455 382, 4552261, 4552262, 4552263, 34082569, 307 102, H04B 700

Patent

active

051932105

ABSTRACT:
A low powered RF receiver for receiving a modulated carrier having a coded transmission so as to remotely control a number of vehicular devices includes an antenna, a preamp stage, mixer, local oscillator, first and second IF bandpass filters, first and second IF amplifiers, a received signal strength indicator/detector circuit, and an adaptive threshold/filter circuitry. The signal strength indicator/detector circuit is interconnected between the first and second IF amplifiers and generates a strength indicator signal which is proportional to the strength of the modulated carrier signal received. The adaptive threshold/filter circuitry is responsive to the strength indicator signal and has a varied threshold reference level for eliminating noise and for converting the strength indicator signal to a logical level. A microcontroller is provided for further signal processing, decoding, and executing the function corresponding to the vehicular device to be controlled.

REFERENCES:
patent: 2608648 (1952-08-01), Magnuski
patent: 4091328 (1978-05-01), Hellman et al.
patent: 4368539 (1983-01-01), Whidden
patent: 4429418 (1984-01-01), Hooper
patent: 4603325 (1986-07-01), Marino et al.
patent: 4619002 (1986-10-01), Thro
patent: 4890332 (1989-12-01), Takahashi
patent: 4914428 (1990-04-01), Kobayashi et al.

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