Atmel Germany Gmbh

Vishay Semiconductor Gmbh

Achim Kruck

A drive circuit has a control signal input for receiving a first control signal at a first circuit input, an optocoupler which is connected to the control signal input and which is adapted to generate a galvanically decoupled second control signal in accordance with the first control signal, an output circuit for controlling at least one circuit output terminal of the drive circuit in accordance with a third control signal, and an electronic control circuit comprising an energy supply, an input for receiving the second control signal, and an output for outputting the third control signal in accordance with the second control signal received at the input.

Drive circuit

A high frequency power detector includes an input coupling arrangement that couples an electrical HF-oscillation into a basic circuit portion including at least a first diode and a circuit node. The power detector further includes a series circuit of a resistor and a second diode connected to the circuit node, as well as a voltage tapping arrangement for detecting or tapping the voltage drop across the second diode as an output signal. The voltage at the circuit node includes a DC component that depends on the power of the HF-oscillation. The output signal, i.e. the voltage drop of the second diode, has a linear voltage characteristic relative to the HF-power in dBm. A method of regulating the HF-power uses such a dBm-linear HF-power detector in a feedback loop for regulating the gain factor of an HF-amplifier.

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Pfedelbach, Germany

Achim Kruck