Browse Prior Art Database

Tunnel Diode Switch With Amplitude Sensitive Reset

IP.com Disclosure Number: IPCOM000098056D
Original Publication Date: 1961-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Ward, TD: AUTHOR

Abstract

The terminating amplitude of a waveform is controlled by feedback into a tunnel diode used as a switch.

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Tunnel Diode Switch With Amplitude Sensitive Reset

The terminating amplitude of a waveform is controlled by feedback into a tunnel diode used as a switch.

The block diagram is the general arrangement of this method of control. A specific application to a simple sweep generator is also shown. Q1 is a current trigger, Q2 is a constant current amplifier, and Q3 is an isolation amplifier.

When the tunnel diode TD is in its high voltage state, Q1 saturates, drawing all the current from Q2. The sweep circuit is turned off. If a positive pulse is applied to the input, the tunnel diode switches to its low voltage state and Q1 turns off. The constant current of Q2 charges C1, thus generating a negative- going sweep at the output. As the sweep goes negative, the current If flows. When this current becomes large enough, TD switches through its negative resistance region to the high voltage state. Q1 turns on, C2 discharges and the sweep is terminated.

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