Audio to uhf frequency synthesizer including a plurality of phase-locked oscillators

Abstract

Abstract A FREQUENCY SYNTHESIZER PROVIDES A PLURALITY OF SELECTABLE VALUES OF SIGNAL FREQUENCIES RANGING FROM LOW AUDIO TO UHF HAVING GOOD SHORT- AND LONG-TERM STABILITY. THE SYNTHESIZER INCLUDES A BASIC OSCILLATOR FOR GENERATING A GOOD LONG-TERM STABILIZED FREQUENCY, AN AUXILIARY OSCILLATOR PHASE-LOCKED WITH THE BASIC OSCILLATOR FOR GENERATING A GOOD SHORT- AND LONGTERM STABILIZED AUXILIARY FREQUENCY, AND A PLURALITY OF VOLTAGECONTROLLED OSCILLATORS IN PHASE-LOCKED RELATIONSHIP WITH SAID AUXILIARY FREQUENCY FOR PRODUCING DIFFERENT SELECTABLE FREQUENCIES WHICH CORRESPOND TO THE SELECTED VALUES OF SIGNAL FREQUENCIES. THE FREQUENCY CORRESPONDING TO THE MOST SIGNIFICANT VALUE OF THE SELECTED FREQUENCY IS OBTAINED BY MIXING A FREQUENCY FROM AN APPROPRIATE SELECTED ONE OF THE VOLTAGECONTROLLED OSCILLATORS WITH A SUBMULTIPLE HARMONIC OF THE AUXILIARY FREQUENCY. FREQUENCIES OF INTERMEDIATE AND LOWER ORDERS OF SIGNIFICANCE ARE OBTAINED FROM VARIOUS SUBFREQUENCY GENERATING STAGES AND ARE MIXED WITH THE FREQUENCY DERIVED FROM THE SELECTED VOLTAGE-CONTROLLED OSCILLATOR TO PROVIDE A PHASE-LOCKED CONTROL VOLTAGE FOR FINE FREQUENCY ADJUSTMENT OF THAT OSCILLATOR. AN OUTPUT MIXING STAGE MIXES THE FREQUENCY OF THE FINELY-ADJUSTED SELECTED OSCILLATOR WITH A FREQUENCY DERIVED FROM SAID AUXILIARY FREQUENCY TO PROVIDE AN OUTPUT FREQUENCY OF SELECTED VALUES HAVING GOOD SHORT- AND LONGTERM STABILITY.

Inventors

• 👤 Herbert Hoeffer
• 👤 Herbert Knirsch
• 👤 Siegfried Rehm

Bibliographic Details