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Browse Prior Art Database

Coherent Frequency-Shift Oscillator

IP.com Disclosure Number: IPCOM000037753D
Original Publication Date: 1989-Jun-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Myers, WV: AUTHOR

Abstract

A free-running programmable oscillator which can have its frequency shifted slightly without phase disturbance is constructed using a latch and two delay lines, one of which is programmable.

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This is the abbreviated version, containing approximately 100% of the total text.

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Coherent Frequency-Shift Oscillator

A free-running programmable oscillator which can have its frequency shifted slightly without phase disturbance is constructed using a latch and two delay lines, one of which is programmable.

The figure shows the oscillator. The Set/Reset latch 1, when set, provides at its Q output 2 a signal which is delayed by Delay 1 device 3. A short Reset pulse is generated by an inverter and AND gate 4 associated with Delay 1 device 3. The length of delay of Delay 1 device 3 determines the up time for the Output signal at node 5. Once Set/Reset Latch 1 is reset, Delay 2 device 6 and its associated inverter and AND gate 7 generate a pulse on line 8 to set the oscillator ON again. Delay 2 device 6 is programmable, so the down time for the Output signal can be varied to control the oscillation frequency.

The Set pulse for AND gate 7 also goes on line 9 to the CK input of the Data Latch 10. A new Delay Data value for Delay 2 is clocked at the time that Delay 2 can be considered "inactive", so oscillation is not disturbed when a new frequency is chosen. The next cycle's down time is simply longer or shorter as programmed by Delay 2 device 6.

Disclosed anonymously.

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