Amplifiers – With periodic switching input-output
Patent
1986-02-24
1987-10-27
Mullins, James B.
Amplifiers
With periodic switching input-output
330 10, 330167, H03F 338
Patent
active
047032839
ABSTRACT:
An isolation amplifier including a full-wave modulator which applies to the primary winding of an isolation transformer an attenuated version of the input signal, to reduce the flux density in the transformer without the need for a complicated flux-nulling feedback arrangement. This is a wide-band modulator with means for protection against the adverse effects of thermal drift in the attenuator. Two or more resistors create a resistive divider across the signal and ground terminals of the isolator's input port. A tap on the resistive divider is connected to the input of a first buffer amplifier whose output is connected in series with a capacitor to one lead of the primary winding of the transformer. The signal input is supplied to one throw of an SPDT analog voltage switch, the other throw of which is connected to ground. The pole of the switch is connected to the input of a second buffer amplifier and the output of that buffer is connected to the other lead of the transformer primary. A carrier signal from a carrier source controls the opening and closing of this switch to "chop" the input signal and provide a modulated input to the transformer. A synchronous demodulator connected to the transformer secondary demodulates the chopped input signal.
REFERENCES:
patent: 3334401 (1967-11-01), Lode
patent: 3416090 (1968-12-01), Harrison
patent: 3921088 (1975-11-01), Feucht
patent: 3931582 (1976-01-01), Kato et al.
patent: 3946324 (1974-11-01), Smith
patent: 4066974 (1978-01-01), Reinhard
patent: 4360784 (1982-11-01), Bartlett
patent: 4383222 (1983-05-01), Morong, III
LandOfFree
Isolation amplifier with T-type modulator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Isolation amplifier with T-type modulator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Isolation amplifier with T-type modulator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1274310