The research of programmable equivalent capacitor circuit

To meet the requirements of scientific research personnel on wide range and high-precision variable capacitor. The new digital capacitor is based on the impedance converting circuit. The new active impedance converting circuit is formed by integration operational amplifiers, a small amount of resistance and capacitance. Through control of the switching circuit part line, thus producing the equivalent pure capacitance. Experimental results show that using digital potentiometer and analog switches adjust circuit resistance to adjust the capacitance value. So that digital equivalent capacitance has certain advantages in the circuit experiment debugging and capacitance adjustable electronic products.