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Instantaneous Analog Storage Circuit

IP.com Disclosure Number: IPCOM000095791D
Original Publication Date: 1964-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Bartz, MR: AUTHOR [+2]

Abstract

Input terminal 10 is connected to the bases of transistors T1 and T2 and receives an analog signal. T1 and T2 form a complementary emitter follower circuit. The emitters of T1 and T2 are connected to the emitter and collector of transistors T3 and T4, respectively. The bases of T3 and T4 are connected under control of transistor T5 which, in turn, is switched by different voltage level control signals applied to control input 20.

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Instantaneous Analog Storage Circuit

Input terminal 10 is connected to the bases of transistors T1 and T2 and receives an analog signal. T1 and T2 form a complementary emitter follower circuit. The emitters of T1 and T2 are connected to the emitter and collector of transistors T3 and T4, respectively. The bases of T3 and T4 are connected under control of transistor T5 which, in turn, is switched by different voltage level control signals applied to control input 20.

With T3 and T4 switched on, the voltage of one side of capacitor C1 follows the voltage of emitters of T1 and T2. However, when T3 and T4 are turned off, the voltage that was on C1 at time of turnoff is held until T3 and T4 are again turned on.

Transistors T6 and T7 are connected as emitter followers and the emitter of T6 is connected to the base of transistor T8. This, in turn, has its emitter connected to the bases of T3 and T4 to supply a voltage to point 25 in proportion to the voltage on C1. This voltage limits the swing of the bases of T3 and T4, thus decreasing the base to emitter voltage on these transistors.

The circuit is particularly useful for storing the value of a video signal at a certain instant of time. The stored value is then available for use in the video clipping system.

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