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Split-path linear isolation circuit apparatus and method
| Details |
Inventors: Baker, Clifford E.; Khaw, Michael P.;
Assignee: Tektronix, Inc. (Wilsonville, OR)
Primary Examiner: Mullins; James B.
Assistant Examiner:
Attorney, Agent or Firm: Bucher; William K., Preiss; Richard B.
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. |
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DETAILED DESCRIPTION An object of this invention is, therefore, to provide an improved split-path isolation apparatus and method having an accurate and stable response over a wide range signal measurement frequency range.
Another object of this invention to provide a simplified split-path isolation amplifier that maintains a stable frequency and pulse response without requiring frequency compensation adjustments.
A further object of this invention is to provide a split-path isolation amplifier having minimum amplitude response drift over a wide temperature range.
Still another object of this invention is to provide a linear split-path isolation amplifier in which an output signal accurately represents an input signal irrespective of nonlinearities in the low-path and high-path isolation barrier devices employed.
Yet a further object of this invention is to provide an oscilloscope having a floating input amplifier that reduces the oscilloscope cost while improving its reliability and manufacturability.
Accordingly, a split-path isolation amplifier circuit employs a magnetic flux hulled transformer in the high path and a single-input, multi-output optocoupler to provide closed-loop feedback in the low path to achieve a flat, wide frequency response without need for frequency compensation adjustments.
In the low-path frequency region, the optocoupler provides all or most of the signal to the output.
The isolation amplifier employs a substantially overlapped crossover frequency region in which the high-path signal is applied to a primary winding of the transformer, and the low-path signal is applied differentially to secondary windings 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
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I/O Systems 
