Current/frequency conversion circuit

Published:2011/7/5 8:28:00 Author:Lucas | Keyword: Current/frequency conversion | From:SeekIC

In the circuit, Al is integral circuit. When it has the current input, the integrator capacitor integrates to a negative direction. A2 output voltage is clamped by regulator diodes VD3 and VD4, so Al is inverted when the output is about -5 · 6V, after VTl is turned on, the integral voltage outputs rapidly until being inverted at +5 · 6V. Al output rising time depends on the clamping voltage, resistor Rl and the integrating capacitor Cl, and reducing the input current Ii and Cl time constant can decrease the rising time. Oscillation frequency is mainly decided by the input current and C1.



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