Patent ID: 6307494
Filing Date: 2001-10-23
Classification: H03K,H03M

Abstract:
A device for rapid digital/analog conversion of pulse width modulated signals, comprising:a device input for carrying an input signal;a device output;a first changeover switch having first, second, and third connections;an inverting integrator having a resistor, a first capacitor, a second changeover switch, a first operational amplifier, and an integrator output;said first operational amplifier having an inverting input, a non-inverting input connected to a reference voltage, and an amplifier output, said inverting input selectively connected to said device input through said first and second connections and said resistor, and said inverting input selectively connected to said amplifier output through said second and third connections;said first capacitor disposed between said inverting input and said amplifier output;a second capacitor;a third capacitor;said second changeover switch having fourth, fifth, and sixth connections, said second changeover switch selectively connecting said integrator output to said second capacitor through said fourth and sixth connections and selectively connecting said integrator output to said third capacitor through said fourth and fifth connections;a buffer amplifier having a non-inverting input, an inverting input, and a buffer amplifier output being said device output;a third changeover switch having seventh, eighth, and ninth connections, said third changeover switch selectively connecting said non-inverting input of said buffer amplifier to said second capacitor through said eighth and ninth connections and selectively connecting said non-inverting input of said buffer amplifier to said third capacitor through said seventh and ninth connections;a monostable multivibrator for producing a multivibrator output signal to selectively switch said first changeover switch, said multivibrator connected to said device input for being triggered by the input signal, said multivibrator having a prescribed operating period; anda frequency divider for producing a divider output signal to trigger said second and third changeover switches, said frequency divider connected to said device input for being triggered by the input signal.