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Browse Prior Art Database

Capacitance Peaking in Cryogenic Circuits

IP.com Disclosure Number: IPCOM000097212D
Original Publication Date: 1962-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Lentz, JJ: AUTHOR

Abstract

In vacuum tube and transistor amplifying circuits, the performance is improved by adding inductance in a manner termed series peaking. With cryogenic thin film loop circuits, the speed of the loop circuits is increased by adding capacitance. This is the dual of the addition of inductance to vacuum tube and transistor circuits to effect series peaking.

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Capacitance Peaking in Cryogenic Circuits

In vacuum tube and transistor amplifying circuits, the performance is improved by adding inductance in a manner termed series peaking. With cryogenic thin film loop circuits, the speed of the loop circuits is increased by adding capacitance. This is the dual of the addition of inductance to vacuum tube and transistor circuits to effect series peaking.

The loop circuit includes two current paths 10 and 11 connected between a current source 12 and a current collector 13. The loop circuit state is changed by selectively making gating element 41 or 42 resistive. Current paths 10 and 11 are also connected in series with the control elements 21 and 31 for two output cryotrons 20 and 30. The cryotrons 20 and 30 respectively have gating elements 22 and 32 which are made resistive by current in controls 21 and 31.

The addition of the expanded portions 25 and 35 to current paths 10 and 11 increases the capacitance of the current paths near control elements 21 and 31. This has the effect of increasing switching speed of the circuit.

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