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Crystal Controlled Oscillator

IP.com Disclosure Number: IPCOM000094362D
Original Publication Date: 1966-Sep-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Nolis, WM: AUTHOR

Abstract

The two crystal-controlled oscillators 1 and 2 of A provide a synchronized output signal at terminal 10. Oscillators 1 and 2 are identical. Each comprises transistor 11, crystals 12 and 13, capacitors 14 and 15 which are part of the tuning circuit of the oscillator, and output trimming condensers 16, 17, and 18. Resistors 19 and 20 are biasing and current limiting resistors respectively. Oscillators 1 and 2 are connected to common voltage source +V through common biasing resistor 21. Synchronizing capacitors 22, 23, and 24 are commonly connected to the base electrode of each transistor associated with oscillators 1 and 2. The redundant construction provides for high reliability.

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Crystal Controlled Oscillator

The two crystal-controlled oscillators 1 and 2 of A provide a synchronized output signal at terminal 10. Oscillators 1 and 2 are identical. Each comprises transistor 11, crystals 12 and 13, capacitors 14 and 15 which are part of the tuning circuit of the oscillator, and output trimming condensers 16, 17, and 18. Resistors 19 and 20 are biasing and current limiting resistors respectively. Oscillators 1 and 2 are connected to common voltage source +V through common biasing resistor 21. Synchronizing capacitors 22, 23, and 24 are commonly connected to the base electrode of each transistor associated with oscillators 1 and 2. The redundant construction provides for high reliability. In operation, the output signals of oscillators 1 and 2, as well as their resultant output signal present at terminal 10, are in synchronization as shown by the first cycle in the waveforms of B. The failure of an output signal of one oscillator does not affect the output signal of the other oscillator, as well as the output signal at terminal 10. Thus there is no deterioration or failure of the waveform of the output signal at terminal 10 due to the deterioration or failure of one oscillator output signal as in the second and third cycles of waveforms B.

At C there are three crystal-controlled oscillators of nonredundant construction. The output of each oscillator is connected to a pulse forming network. For example, network 26 converts the output signal of oscillator 25 to a square-wave pulse output signal available at terminal 1. Each oscillator and pulse former networks I, II, and III are identical. The base electrodes of each associ...