Pluse width modulator

Claim 1

A PULSE WIDTH MODULATOR COMPRISING: (A) A CLOSED LOOP ELECTRONIC INTEGRATOR INCLUDING AN OPERATIONAL AMPLIFIER; (B) SWITCHING MEANS FOR APPLYING AN INPUT SIGNAL TO SAID INTEGRATOR DURING A FIRST MODE AND A FIXED REFERENCE SIGNAL DURING A SECOND MODE FOR INTEGRATING BACK TOWARDS THE INITIAL SIGNAL LEVEL; (C) A LIMITER TYPE CIRCUIT CONNECTED IN THE FEEDFORWARD PORTION OF SAID INTEGRATOR LOOP AS A COMPARATOR WHEREIN THE LIMITING SIGNAL IS SAID INTEGRATOR INITIAL SIGNAL; (D) SAID COMPARATOR CIRCUIT INCLUDING A SERIES AMPLIFIER HAVING A NONLINEAR ELEMENT WHICH IS CONNECTED SO AS TO REGENERATIVELY DRIVE SAID OPERATIONAL AMPLIFIER OUTPUT SIGNAL MAGNITUDE TOWARDS SATURATION PAST THE INITIAL INTEGRATOR SIGNAL WHEREBY THE PULSE WIDTH TERMINATION IS DETECTED ACCURATELY AND WITH A FAST RISE TIME; (E) A SOURCE OF PULSE WIDTH MODULATED OUTPUT PULSES, WHICH ARE INITIATED IN SYNCHRONISM WITH SAID SWITCHING MEANS STARTING THE SECOND MODE AND HAVE A DURATION EQUAL TO THE TIME REQUIRED TO INTEGRATE BACK TO THE ORIGINAL SIGNAL LEVEL, IN RESPONSE TO SAID COMPARATOR CIRCUIT.