Wide range voltage controlled oscillator

Abstract

Abstract A VOLTAGE CONTROLLED OSCILLATOR (VCO) FOR PRODUCING SQUARE WAVEFORMS OVER A WIDE, LINEARLY CONTROLLED FREQUENCY RANGE. THE VCO COMPRISES A COMPARATOR HAVING A NONINVERTING FEEDBACK LOOP, AN INVERTING FEEDBACK LOOP, AND A SIGNAL OUTPUT. THERE IS A RESISTOR IN THE NONINVERTING FEEDBACK LOOP AND A DIFFERENTIATOR IN THE FORM OF A CAPACITOR IN THE INVERTING FEEDBACK LOOP. THE NONINVERTING ANDINVERTING FEEDBACK LOOPS CONNECT THE SIGNAL OUTPUT WITH RESPECTIVE INPUTS TO THE COMPARATOR AND A SERIES RESISTOR AND VARIABLE RESISTOR ARE POSITIONED BETWEEN THE TWO LOOPS TO REGULATE OSCILLATION FREQUENCY. A POINT BETWEEN THE RESISTOR AND VARIABLE RESISTOR IS ADAPTED TO BE GROUNDED. WHEN THE SQUARE WAVE PRODUCED BY THE COMPARATOR PASSES THROUGH THE RESISTOR IN THE NONINVERTING FEEDBACK LOOP A DIMINISHED REFERENCE SIGNAL IS PRODUCED, WHEN THE SQUARE WAVE PASSES THROUGH THE DIFFERENTIATOR IN THE INVERTING FEEDBACK LOOP, THE WAVEFORM DECAYS AND A DIFFERENTIATED SQUARE WAVE IS PRODUCED. THE DIFFERENTIAL SQUARE WAVE AND THE REFERENCE SIGNAL ARE COMPARED IN THE COMPARATOR AND WHEN THE TWO SIGNALS CROSS AT A COMMON VOLTAGE THE SQUARE WAVE PRODUCED BY THE COMPARATOR IS TRIGGERED IN THE REVERSE DIRECTION CAUSING OSCILLATION TO OCCUR. THIS SIMPLIFIED CIRCUIT CAN BE LINEARLY CONTROLLED OVER A TUNING RANGE OF SEVERAL OCTAVES.

Inventors

• 👤 Dyas N Harvey Jr

Bibliographic Details