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Nonsaturating Low Source Impedance Complementary Driver

IP.com Disclosure Number: IPCOM000093545D
Original Publication Date: 1967-Oct-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Bellamy, PD: AUTHOR [+2]

Abstract

The word driver has a small delay, low power consumption, ability to supply load current in either direction, and very low source impedance. The driver is suitable for monolithic packaging.

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Nonsaturating Low Source Impedance Complementary Driver

The word driver has a small delay, low power consumption, ability to supply load current in either direction, and very low source impedance. The driver is suitable for monolithic packaging.

Each transistor remains in conduction in either the up or down state of the input signal. Assume the input is in its up state at -.3V and Vbe of each transistor is 0.7V. The output level is determined by Vbe of T2 and in the case assumed is -1.0V. The collector current of T2 produces a potential drop in R1, thus setting the base voltage bias of T1. The emitter voltage of T1 and the base voltage of T3, established by Vbe of T3 and its emitter supply voltage, appearing across R2 determine the current in R2 and consequently the base current of T3. Since T3 has current gain and its collector current passes through T2 and R1, the ultimate magnitude of this current adjusts itself to a value determined by total current gain around the loop. If more current is required to flow in or out of the output node, the collector current adjusts itself, within limits, to maintain the same output voltage thus providing good regulation and low output impedance.

The same operation takes place at the other input level of -.9V with different values of currents in each element. The entire circuit operates linearly, thus producing low delay values.

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