Noncoherent-coherent A.C. coupled base band AGC receiver

Details Noncoherent-coherent A.C. coupled base band AGC receiver Noncoherent-coherent A.C. coupled base band AGC receiver

1988-10-27

1990-02-13

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 82, 329308, 455265, H03D 318

Patent

active

049013327

ABSTRACT:
The present invention describes a phase shift key receiver or demodulator having an A.C. couple base band automatic gain control. A pair of detectors for the automatic gain control are A.C. coupled to the output of a pair of linear analog multipliers for the purpose of eliminating DC offset signals and for minimizing thermal noise at the input of the automatic gain control circuit. The outputs of the pair of detectors connected in the data detecting branch and the carrier tracking branch of the PLL are connected to a input of the summing circuit whose output is connected to the automatic gain control loop filter. The output of the filter supplies the scaling signal employed as the scaling input to the linear analog multipliers.

REFERENCES:
patent: 3828138 (1974-08-01), Fletcher et al.
patent: 4085378 (1978-04-01), Ryan et al.
patent: 4542347 (1985-09-01), Verfaillie et al.
patent: 4546323 (1985-10-01), Ryu
patent: 4574246 (1986-03-01), Yoshida
patent: 4789897 (1988-12-01), Kappeler et al.

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