Circuit for eliminating amplitude temperature drift of Venturi oscillator
A technology of oscillator and Venturi, which is applied in the field of measurement signal source, can solve the problems of high production cost, complex circuit, compensation and elimination, etc., and achieve the effect of simple method, elimination of amplitude temperature drift and obvious effect
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[0009] like figure 2 As shown, a circuit that eliminates the temperature drift of the Wien oscillator amplitude. It is composed of 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; the input terminal of the second detection circuit 3 is connected to the Venturi oscillator 1 Output V 1 Connected, its output is connected to the reference voltage input terminal V of the analog-to-digital converter A / D R connection; where the Wien Oscillator 1 output V 1 , The input terminal of the operational amplifier circuit A is respectively connected with the measured equivalent resistance R X Both ends are connected. In the above circuits, the second detection circuit 3 and the first detection circuit 2 must be the same circuit.
[0010] According to the principle of the op amp circuit:
[0011] V 2 = ...
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