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Browse Prior Art Database

Active Antisaturation Clamp

IP.com Disclosure Number: IPCOM000075695D
Original Publication Date: 1971-Nov-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Leung, H: AUTHOR

Abstract

The use of diodes D2 and D3 prevents transistor T1 from going into saturation by maintaining a positive potential between the collector and base of transistor T1.

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Active Antisaturation Clamp

The use of diodes D2 and D3 prevents transistor T1 from going into saturation by maintaining a positive potential between the collector and base of transistor T1.

The voltage across the collector-to-base of transistor T1 is equal to the difference between the voltage across diodes D3 and the voltage across D2, or in other words V(CB) = n V(D3) - V(D2) where n is the number of diodes needed to insure a positive value of V(CB) To insure that diodes D3 remain conducting, the current I(C2) through T2 must be maintained greater than the current I(D2) through D2. To this end, resistor R is selected so that for all conditions the current I(C2) is greater than the current I(D2). This can be written as follows: R = V(D1) - V(BE2) - V(1) over I(C2).

In this circuit, the collector of T1 constitutes a high-current, high-voltage output suitable for driving a transformer and the emitter of T1 is a low- impedance, high-current, low-voltage output suitable for driving a transmission line.

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