Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Stabilized Transistor Oscillator

IP.com Disclosure Number: IPCOM000098848D
Original Publication Date: 1958-Jun-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Cannon, MR: AUTHOR

Abstract

This transistor oscillator provides amplitude-stabilized output voltage and stable frequency despite variations of supply voltage, load or temperature. No critical tuned circuits are necessary. The device consists of two stages of common emitter amplification, a means for controlling the gain of the low level stage (Zener reference diode), and a crystal filter for passing the signal of desired frequency.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Stabilized Transistor Oscillator

This transistor oscillator provides amplitude-stabilized output voltage and stable frequency despite variations of supply voltage, load or temperature. No critical tuned circuits are necessary. The device consists of two stages of common emitter amplification, a means for controlling the gain of the low level stage (Zener reference diode), and a crystal filter for passing the signal of desired frequency.

Although some distortion may occur in the variable gain stage, the undesirable frequency components are greatly attenuated by the crystal filter which is operated at its series resonant frequency. At the operating frequency, the crystal then presents a very low resistance and negligible phase shift to the signal. At other frequencies the reactance of the crystal is high. Degenerative feedback in the high level stage minimizes distortion after the filter.

The illustration shows a typical low power oscillator using emitter current control of the variable gain stage. The circuit also can be arranged to provide a medium power oscillator employing collector voltage control of the variable gain stage.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text objects]