Directly mixing synchronous receiver

Details Directly mixing synchronous receiver Directly mixing synchronous receiver

1987-10-30

1989-09-05

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455265, 455255, 331 2, 331 50, 331 25, H04B 116, H03L 700

Patent

active

048646407

ABSTRACT:
Directly mixing synchronous receiver having an RF input (1) and a first signal path (S1) which is coupled thereto and which incorporates a first synchronous demodulator (3) and a first low-pass filter (4), and having a carrier regeneration circuit including a first phase-locked loop (Q) incorporating in a loop configuration a first phase detector (5) which is coupled to the RF input (1), a first loop filter (6) and a first voltage-controlled tuning oscillator (8) an output of which is coupled to the first phase detector (5), on the one hand, and to the first synchronous demodulator (3) via a phase shift circuit, on the other hand, for a direct demodulation of an RF reception signal to the frequency baseband. The local mixing carrier required for the direct synchronous demodulation should be accurately in phase or in antiphase with the carrier of a desired RF reception signal to be demodulated. To this end the phase shift circuit includes a second phase-locked loop (P) incorporating in a loop configuration a second phase detector (8) which is coupled to said output of the first voltage-controlled oscillator (7), a second loop filter (9) and a second voltage-controlled tuning oscillator (10) an output of which is coupled to the second phase detector (8), on the one hand, and to the first synchronous demodulator (3), on the other hand, the tuning of the first voltage-controlled tuning oscillator (7) being coupled with that of the second voltage-controlled tuning oscillator (10).

REFERENCES:
patent: 4143322 (1979-03-01), Shimamura
patent: 4399560 (1983-08-01), Watkinson
patent: 4500851 (1985-02-01), Sawa et al.
patent: 4517531 (1985-05-01), Tan et al.
patent: 4569064 (1986-02-01), Collin et al.
patent: 4631499 (1986-12-01), Kasperkovitz
patent: 4742566 (1988-05-01), Nordholt et al.

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