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Browse Prior Art Database

Gated Oscillator

IP.com Disclosure Number: IPCOM000093733D
Original Publication Date: 1966-Jan-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Spadavecchia, RI: AUTHOR

Abstract

This circuit is a gated oscillator. The frequency of oscillation is determined by the length of a shorted transmission line.

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Gated Oscillator

This circuit is a gated oscillator. The frequency of oscillation is determined by the length of a shorted transmission line.

The oscillator consists of two transistors T10 and T12 whose emitters are directly coupled to a source of negative potential -V via resistor 14. An input gating signal is applied through conductor 16 to the base of T10. The collector of T10 is connected in common to the base of T12 and to the input to delay line 18. The output of delay 18 is shorted to ground and its delay is denoted td. The output from this circuit is taken from the collector of T12 across resistor 20.

When the input gate signal on conductor 16 is low, the circuit is stable in that T10 is nonconductive and T12 is conductive. T12 is conductive for the reason that its base is more positive than its emitter. To cause oscillations to occur, the gate signal is brought up to ground potential. As this occurs, T10 begins conducting, thus allowing its collector potential to fall which in turn renders T12 nonconductive.

The collector potential fall of T10 is also propagated down delay 18 and reflected back from the shorted end. The reflected voltage has a positive polarity which when it reaches the common connection between the base of T12 and collector of T10 renders T12 conductive. The conduction of T12 results in an increase of potential across resistor 14 which raises the emitter potential of T10 and causes it to become nonconductive.

Since T10 is thus rendered...