Self-oscillating transmitter

Details Self-oscillating transmitter Self-oscillating transmitter

1989-08-08

1990-11-20

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

331149, 331166, 128419P, 128419PG, H03B 1100, H03L 704

Patent

active

049724380

ABSTRACT:
A device for use as a self-oscillating Class D transmitter is disclosed which uses feedback to maintain the oscillation at the resonant frequency of the device, thereby optimizing the efficiency of operation and overcoming the frequency mismatching inherent in previously known transmitters. The device uses a series LC combination which is driven by a comparator and a tri-state logic driver, with a feedback loop using a differentiator used to switch the polarity of the square wave generator. The system thus self-oscillates at the resonant frequency of the capacitor and inductor, even when the inductance of the inductor is varied by the inductor coming into close proximity to another inductor.

REFERENCES:
patent: 3720883 (1973-03-01), Hess et al.
patent: 4649298 (1987-03-01), Tuhy

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