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Schottky Diode Current Switch

IP.com Disclosure Number: IPCOM000075948D
Original Publication Date: 1971-Dec-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Bode, JW: AUTHOR [+2]

Abstract

This circuit provides the use of a Schottky barrier diode in place of the conventional diode 10 in the current switch, as shown in Fig. 1 of the Yourke Patent No. 2,964,652. The advantages are greater speed due to the low capacitance of a Schottky diode and smaller area, since the Schottky diode takes up about one-third the area of a conventional diode or transistor. The circuit, redrawn with an NPN transistor 1 and Schottky diode 2, is shown in the drawing.

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Schottky Diode Current Switch

This circuit provides the use of a Schottky barrier diode in place of the conventional diode 10 in the current switch, as shown in Fig. 1 of the Yourke Patent No. 2,964,652. The advantages are greater speed due to the low capacitance of a Schottky diode and smaller area, since the Schottky diode takes up about one-third the area of a conventional diode or transistor. The circuit, redrawn with an NPN transistor 1 and Schottky diode 2, is shown in the drawing.

An additional advantage of this use of the Schottky diode, results from the difference in the forward voltage-current characteristics of the Schottky diode and the emitter-base junction of the transistor it replaces. The lower forward voltage of the Schottky diode shifts the threshold of the circuit such that the logic levels are 0 volts and 0.8 volt, as opposed to -0.4 volt and +0.4 volt. The terminating resistor RT does not need to be returned to a -0.4 volt power supply but can be connected to ground as shown, eliminating the need for this power supply.

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