Circuit for eliminating amplitude temperature drift of Venturi oscillator
An oscillator and Venturi technology, applied in the field of measuring signal sources, can solve the problems of insufficient compensation, complex circuits, and high production costs, and achieve the effect of eliminating amplitude temperature drift, obvious effect, and simple method
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[0009] As shown in Figure 2, a circuit that eliminates the influence of the temperature drift of the Wien oscillator amplitude on the measurement. Including a Venturi oscillator 1, an operational amplifier circuit A, a first detection circuit 2, an analog-to-digital converter A / D, and a second detection circuit 3; wherein the input terminal of the second detection circuit 3 is connected to the output of the Venturi oscillator 1 terminal connection, and its output terminal is connected to the reference voltage input terminal V of the analog-to-digital converter A / D R Connect; wherein the input end of the first detection circuit 2 is connected with the output end of the operational amplifier circuit A, and its output end is connected with the voltage input end V of the analog-to-digital converter A / D in Connection; where the output of the Wien oscillator 1 and the input of the operational amplifier circuit A are respectively connected to the measured equivalent resistance R X B...
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