FIELD: measurement technology, conversion of controlled physical parameter to electric signal. SUBSTANCE: given converter is self-excited system with combination interaction of signals of three frequencies. It incorporates reference generator and closed loop of two mixers, controllable bandpass amplifier and equivalent bandpass amplifier with phase-frequency mirror-symmetric with reference to frequency axis. Controlling input of controllable bandpass amplifier is connected to transducer. Equivalent bandpass amplifier is formed by four bandpass amplifiers and two mixers. Converter also includes unit extracting signals with difference frequency. Inputs of unit extracting signals with difference frequency are connected to outputs of controllable bandpass amplifier and equivalent bandpass amplifier. Output of unit extracting signals with difference frequency is connected to recorder. Converter displays high sensitivity to little changes of parameter of transducer if low gain- bandwidth products are utilized. EFFECT: enhanced functional potential of converter. 1 dwg
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