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high-voltage interface

2014-11-15 07:15  
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The circuit uses fast transimpedance amps, `floated` at 70V. Two `virtual-zener` circuits step down the high-voltage signals for subsequent processing in a ground-referred differential-amplifier stage (Figure 1). The circuit drops exactly 65.58V dc with the component values shown, notwithstanding errors arising from op-amp offset voltages and resistor tolerances. visit page.
The op amp`s power-supply rails and output range, along with the voltage drop across R3, limit the output-voltage compliance. C1 bypasses R1. This bypass swamps the bandwidth-reducing effect of capacitance at the noninverting input, and it greatly r visit page.