PA30Bi-H Power Amplifier User Manual
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5. Function and Features of Voltage
Amplifier
5.1 Basic Principle
This voltage power amplifier is a linear voltage power amplifier specially targeting at the
PT characteristics of power system with the strengths of high accuracy, high voltage and
quick response, which consists of below parts mainly:
1) High-speed differential input circuit for amplifier;
2) High-performance voltage power amplifier module;
3) Distortion detection and alarm circuit. Each amplifier has the overload or output
distortion detection circuit. When the overload or short-circuit situation disappears, the
amplifier will resume to work automatically.
4) Temperature protection circuit. It will terminate the amplifier as soon as the
temperature of the amplifier reaches dangerous degree and will let the amplifier resume
to work automatically when it has been cooled down to a reasonable level.
5) Temperature-controlled fan. Fan will work at low speed if amplifier temperature is
certain low, which is benefit for prolonging its service life and reducing working noise.
5.2 Function
1) The differential input circuit can reduce the influence of the common mode noise to
make it possible that use long wires to connect across the amplifier and signal source,
