General absolute value circuit

Details General absolute value circuit General absolute value circuit

1995-06-27

1998-05-12

Faile, Andrew

Electrical pulse counters, pulse dividers, or shift registers: c

Charge transfer device

Particular input or output means

348303, 257239, H03K 2374, G11C 1928

Patent

active

057517797

ABSTRACT:
A general absolute value circuit for developing a true, symmetric or bipolar, absolute value output signal from an input charge signal, compact enough to be used on a sensor chip incorporated into (or used in combination with) a pixel processor of the type used in imaging and other systems that collect electromagnetic radiation as part of on-chip circuitry, includes a balanced differential amplifier combined with a merged dual shelf transistor structure. The balanced differential amplifier, in response to an input charge signal, drives the merged dual shelf transistor structure which in turn generates the desired true absolute value output signal. Such circuitry may be used in imaging systems to implement focal-plane processing algorithms or may be used for performing a single read true absolute value computation by a pixel processor located on a sensor chip. The merged dual shelf transistor structure enhances performance and speed of the processor in which it is incorporated.

REFERENCES:
patent: 4906915 (1990-03-01), Abdi
patent: 5250824 (1993-10-01), Janesick

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