Split-path linear isolation circuit apparatus and method

Details Split-path linear isolation circuit apparatus and method Split-path linear isolation circuit apparatus and method

1995-01-13

1996-05-14

Mullins, James B.

Amplifiers

Having light-controlled or activated device

324121R, 330126, 330308, H03F 368, H03F 1700, G01R 1320

Patent

active

055171540

ABSTRACT:
A split-path isolation amplifier (10) employs a transformer (30) in a high path (26) and a single-input, dual-output closed-loop optocoupler (66) in a low path (24) to achieve a flat, wide frequency response without need for frequency compensation adjustments. In a low path frequency region (106), the optocoupler provides all or most of the signal to the output. The isolation amplifier employs a substantially overlapped crossover frequency region (104) in which the high path signal is applied to a primary winding (28) of the transformer, and the low path signal is applied differentially to secondary windings (40, 42) of the transformer. At frequencies below the crossover frequency range, the signal from the optocoupler dominates as the signal coupled from the primary winding rolls off. At frequencies above the crossover frequency range, the signal coupled from the primary winding dominates as the signal from the optocoupler rolls off. At frequencies within the crossover frequency range magnetic flux components generated by the primary and secondary transformer windings co-act to provide a combined output signal having a flat frequency response. The only adjustments are those required to match the gain of the low path to the gain of the high path and to compensate for any offset in the low path.

REFERENCES:
patent: 3525041 (1970-08-01), Velsink
patent: 3733514 (1973-05-01), Garuts
patent: 4482862 (1984-11-01), Leehey
patent: 4682101 (1987-07-01), Cattaneo
patent: 5121075 (1992-06-01), Roach
Model A6902B Isolation Amplifier Service Manual, Tektronix, Inc., Beaverton, Oregon, 1986, p. A2.

Affiliated with

Also associated with

Rating

Split-path linear isolation circuit apparatus and method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Split-path linear isolation circuit apparatus and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Split-path linear isolation circuit apparatus and method will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1898920