Phase modulator circuit

Details Phase modulator circuit Phase modulator circuit

1988-10-26

1990-06-05

Olms, Douglas W.

Pulse or digital communications

Repeaters

Testing

455601, 332146, H04L 2552

Patent

active

049320386

ABSTRACT:
A phase modulator circuit includes a pair of similar long-tailed pair transistor amplifiers (TR11, TR12 and TR13, TR14) to which sinusoidal signals are fed. The transistor pairs form the collection loads of a further long tailed pair (TR21, TR22) fed with a modulator signal. The circuit generates an output of constant amplitude but modulated in phase in correspondence with the modulated signal. The circuit may be used in the supervisory unit of a telecommunication repeater.

REFERENCES:
patent: 3815052 (1974-06-01), Watatani et al.
patent: 4131861 (1978-12-01), Malauiya
patent: 4393279 (1983-07-01), Cochrane et al.
patent: 4584542 (1986-04-01), Shinbara
patent: 4606049 (1986-08-01), Daniel
patent: 4710970 (1987-12-01), Wu et al.

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