Browse Prior Art Database

Oscillator

IP.com Disclosure Number: IPCOM000097243D
Original Publication Date: 1962-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Craig, WE: AUTHOR

Abstract

The basic oscillator generates square waves. Two or more of the oscillators can be connected so that they are synchronized.

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

Oscillator

The basic oscillator generates square waves. Two or more of the oscillators can be connected so that they are synchronized.

The basic circuit comprises transistor 10 having an inductor 11 in its base circuit. Piezoelectric crystal 12 is disposed in parallel with inductor 11 and the base-collector circuit of transistor 10. The collector is connected through resistor 13 to voltage source V. Power is supplied to the base of the transistor from a voltage divider comprising resistors 14 and 15. Output pulses are taken over conductor 16. Inductor 11 provides a large voltage swing at the base of 10 to drive it from saturationto cutoff, thus producing the square wave output. The inductor defines a current limiting resistance at the oscillator frequency so that the maximum dissipation of the piezoelectric crystal is not exceeded.

To interconnect a pair of the oscillator stages 19 and 20, an air core or non saturable transformer 21 is used. The collectors of the transistors are connected to provide a common output. When both oscillators are operating, they are synchronized by transformer 21. Either oscillator may fail without loss of the square wave output. Any type of failure in one of the stages does not cause saturation of the winding of the transformer associated with other stages.

1

Page 2 of 2

2

[This page contains 1 picture or other non-text object]