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Browse Prior Art Database

Tunnel Diode Protector

IP.com Disclosure Number: IPCOM000094303D
Original Publication Date: 1966-Aug-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Wilson, HR: AUTHOR [+2]

Abstract

The circuit provides threshold current which is substantially independent of temperature, aging and drifts of the amplifier driving the tunnel diode. The tunnel diode detector circuit includes transistors T1, T2 and T3 which form a current feedback amplifier. The transistors are so matched that V2 is essentially at ground potential. The feedback current 1 is maintained extremely small because of the high forward loop gain. If a small value of R2 is used then V' is near ground potential and the current in the collector of T3 and in tunnel diode TD is -V1/(R3+R4). R4 is a high precision resistor mounted external to the monolithic amplifier circuit and is greater in value than R3. R4 is bypassed by an external capacitance C. Thus, the TD current is controlled by V1 and R4 which are well defined.

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Tunnel Diode Protector

The circuit provides threshold current which is substantially independent of temperature, aging and drifts of the amplifier driving the tunnel diode. The tunnel diode detector circuit includes transistors T1, T2 and T3 which form a current feedback amplifier. The transistors are so matched that V2 is essentially at ground potential. The feedback current 1 is maintained extremely small because of the high forward loop gain. If a small value of R2 is used then V' is near ground potential and the current in the collector of T3 and in tunnel diode TD is -V1/(R3+R4).

R4 is a high precision resistor mounted external to the monolithic amplifier circuit and is greater in value than R3. R4 is bypassed by an external capacitance C. Thus, the TD current is controlled by V1 and R4 which are well defined. The AC gain of the amplifier is determined by the ratio R2/R3. Using a small R2, the feedback is high, giving good AC or pulse gain tolerance and wide bandwidth.

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