A New Shadow Frequency to Voltage Converter as a Read-out Circuit for
Resistive Sensors
Abstract
This paper presents a shadow signal generator that produces
square and triangular waveforms. The oscillator frequency can be changed
using an external circuit (shadow oscillator). This method will make the
conversion speed better than the conventional oscillators. The technique
is based on utilizing an external circuit to modify the comparator’s
tripping point. The circuit is built using widely available commercial
integrated circuits, 1% accurate resistors, and DC supplies with a ±5V
voltage. The recommended setup is suitable for instrumentation where the
oscillation frequency is directly proportional to the variation in the
resistance of the sensor. The functionality of the proposed design was
confirmed by experimentation and simulation. The oscillation’s frequency
can be changed to be nearly 10 times greater than its starting value,
according to the results.
