Accession Number : ADD001276

Title :   High-Purity, Frequency-Stable, Adjustable, Wien-Bridge, Oscillator.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Schwerdt,Christopher B

Report Date : 16 Jul 1974

Pagination or Media Count : 7

Abstract : The patent describes a high-purity, amplitude-stable, adjustable, Wien bridge oscillator using a single amplifier component and a pair of nonlinear devices. A single operational amplifier is used in place of two amplifier components. A lamp in the degenerative-feedback path provides amplitude stabilization of the output oscillations. A back-to-back zener diode in series with a resistor is connected between the inverting input of the operational amplifier and a junction between the series resistor-capacitor arm of the bridge circuit thereby extending the linear operating-frequency range of the oscillator, improving amplitude stability of the output oscillations, and preventing output D.C. drift from feeding back to the inverting input of the operational amplifier through the back-to-back zener diode.

Descriptors :   *Oscillators, *Patents, Electric bridges, Operational amplifiers, Avalanche diodes, Frequency, Stability

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE