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Voltage and Temperature Stable Single Shot

IP.com Disclosure Number: IPCOM000095326D
Original Publication Date: 1965-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Skarshinski, L: AUTHOR

Abstract

The single-shot produces a pulse output which is substantially independent of ambient temperature and variations in the power supply voltage.

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Voltage and Temperature Stable Single Shot

The single-shot produces a pulse output which is substantially independent of ambient temperature and variations in the power supply voltage.

In the quiescent state, transistor T2 is nonconducting and transistor T4 conducting. A positive initiating pulse applied to the input terminal A, acting via T1, emitter-follower T3, and the timing network R5, R6, and C2 causes T4 to become nonconducting and T2 conducting. This yields the output pulse at terminal C which receives its response from the emitter-follower T3. The principal timing is vested in R5, R6 and C2. D2, R10 and the base of T4 also affect the timing, but to a much lesser extent. The output pulse at terminal C can be interrupted by a positive stop pulse on terminal 13, thus restoring the circuit status to the quiescent state.

The temperature and supply voltage compensation is provided by the D3-R7 network. Varying the resistance of R7, or connecting more diodes in series with D3, alters the voltage coefficient of the single-shot pulse duration from a normal negative quantity, i.e., longer pulse duration for a lower voltage, through zero to a positive quantity, i. e., longer pulse for a higher supply voltage. Temperature compensation is likewise achieved through the temperature sensitivity of D3 in a like manner to that of the transistors, particularly if the proper thermally responsive materials are chosen for D3.

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