Preamplifier for an imaging system

Details Preamplifier for an imaging system Preamplifier for an imaging system

1984-08-23

1987-12-01

LaRoche, Eugene R.

Amplifiers

Combined with automatic amplifier disabling switch means

330 9, 330300, H03F 114

Patent

active

047107251

ABSTRACT:
A preamplifier for use in an imaging system including a charge-injection device employs an amplifier, at least a first switch and a clamping loop. The switch is capable of grounding the amplifier reference outside the blanking interval and is open during at least a portion of the blanking interval, thereby preventing the amplifier from entering saturation during the charge injection performed by the charge-injection device. The clamping loop serves to maintain the output of the preamplifier at a predetermined constant level during that portion of the blanking interval in which the amplifier is disabled. The inventive preamplifier has a reduced input impedence and capacitance, and thus operates with less overall noise.

REFERENCES:
patent: 3681703 (1972-08-01), Johnson
Baker, W. D., Barbe, D. F. and Sumney L. W., "Charge Coupled Device Applications", Naval Research Review, Dec. 1974, pp. 22-45.

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