Amplifiers – With periodic switching input-output
Patent
1980-11-03
1983-05-10
Mullins, James B.
Amplifiers
With periodic switching input-output
330 10, 330 75, 330165, H03F 338
Patent
active
043832229
ABSTRACT:
A signal isolator including a coupling transformer with modulate/demodulate switches in series with the primary and secondary windings. The switches are driven in synchronism by an oscillator. Resonating capacitors are connected in parallel with the transformer windings and tuned to the switch operating frequency to control the flux in the transformer core. A transformer turns-ratio of less than unity introduces a corresponding attenuation, and a following amplifier counteracts that attenuation to produce an output signal at the original level. A return current resistor is connected between the output signal and the transformer secondary to produce a back-flow of current towards the transformer. This current provides for supplying the losses of the coupling circuit in a symmetrical fashion, both from the isolator input and its output, to reduce significantly variations in performance resulting from changes in ambient temperature.
REFERENCES:
patent: 3405366 (1968-10-01), Philbrick
patent: 3946324 (1976-03-01), Smith
patent: 3956707 (1976-05-01), Bruyere
patent: 4191929 (1980-03-01), Max et al.
Analog Devices Incorporated
Mullins James B.
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