Patent ID: 6850097
Filing Date: 2005-02-01
Classification: H02M

Abstract:
1. An electronic circuit, comprising: a voltage reference source for providing a first reference voltage and a second reference voltage, the first reference voltage more positive the second reference voltage, the voltage reference source including a voltage divider connected between a first DC input terminal and a second DC input terminal, the voltage divider providing the first reference voltage and the second reference voltage, the voltage divider including a resistive voltage ladder providing a DC-offset reference voltage between the first reference voltage the second reference voltage; a signal generator for generating a reference signal that varies between a maximum voltage that is more positive than the first reference voltage and a minimum voltage that is less positive than the second reference voltage; a voltage follower connected between the resistive voltage ladder and the signal generator so as to provide the DC-offset reference voltage to the signal generator; a first comparator connected to the signal generator and the voltage reference source so as to compare the reference signal to the first reference voltage and provide as an output a first series of output pulses each of which lasts during a discrete interval during which the reference signal is more positive than the first reference voltage; and a second comparator connected to the signal generator and the voltage reference source so as to compare the reference signal to the second reference voltage and provide as an output a second series of output pulses each of which lasts during a discrete interval during which the reference signal is less positive than the second reference voltage.