Voltage isolation circuit for a measurement channel

Details Voltage isolation circuit for a measurement channel Voltage isolation circuit for a measurement channel

1997-05-01

1998-11-10

Mullins, James B.

Amplifiers

With plural amplifier channels

Amplifying different frequencies in different channels

330 59, 330 84, 330308, H03F 368

Patent

active

058349731

ABSTRACT:
A voltage isolation circuit having an improved method of combining the HF path and LF path is provided. The LF path comprises an opto-isolator to achieve voltage isolation of the input signal while passing low frequencies. The HF path comprises a transformer to achieve voltage isolation of the input signal while passing high frequencies. The HF path and LF path are combined at a summing node to obtain an isolated input signal. Obtaining a flat frequency response requires that the cross-over frequency between the LF path and HF path be closely matched. A portion of the LF path is injected into the HF path such that LF components are canceled out in the region of the transition frequency. In this way, the pole frequency of the transformer in the HF path may be compensated for to achieve a flat frequency response for the combined LF and HF paths.

REFERENCES:
patent: 2760011 (1956-08-01), Berry
patent: 2961614 (1960-11-01), Neff
patent: 5517154 (1996-05-01), Baker et al.

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