Title :
Digitally programmable gain control circuit for charge-domain signal processing
Author :
Fossum, E.R. ; Kemeny, S.E. ; Bredthauer, R.A. ; LaShell, M.
Author_Institution :
Dept. of Electr. Eng., Columbia Univ., New York, NY, USA
fDate :
4/1/1991 12:00:00 AM
Abstract :
A simple, nearly passive circuit for programmable gain control of charge-domain signals is described. The circuit is functionally equivalent to a multiplying digital-to-analog converter (MDAC) and is implemented in a 3-μm double-poly, double-metal charge-coupled device (CCD) process. Two implementations of the circuit are reported: a single-stage recursive converter, and a ten-stage pipeline converter. The latter occupies 0.4 mm2 of chip area and consumes approximately 2 μW for a 1-kHz conversion rate. The circuit is shown experimentally to have all 8-b equivalent accuracy in both differential and integral linearity and is expected to find application in focal-plane image processing for both detector nonuniformity correction and convolution weighting
Keywords :
charge-coupled device circuits; convertors; gain control; pipeline processing; signal processing equipment; 1 kHz; 2 muW; 3 micron; Si; charge-coupled device; charge-domain signal processing; convolution weighting; detector nonuniformity correction; double metal CCD process; double-poly; focal-plane image processing; multiplying DAC; polysilicon; programmable gain control circuit; single-stage recursive converter; ten-stage pipeline converter; Charge coupled devices; Convolution; Detectors; Digital-analog conversion; Gain control; Image converters; Image processing; Linearity; Passive circuits; Pipelines;
Journal_Title :
Solid-State Circuits, IEEE Journal of
