A 32-channel charge readout IC for programmable, nonlinear quantization of multichannel detector data
- Case Western Reserve Univ., Cleveland, OH (United States). Dept. of Electrical Engineering and Applied Physics
- General Electric Medical Systems, Waukesha, WI (United States)
- General Electric Corporate Research and Development, Schenectady, NY (United States)
A Charge Readout Integrated Circuit (CRIC) which converts detector charges to digital codes is described. The CRIC provides 32 channels of circuitry needed to form charge-to-digital converters having a total dynamic range of 17 b comprised of 4 b of pre-amp gain control and a conversion range of 13 b. Each channel includes a switched-capacitor integrator, a double-sampling amplifier, a sampling comparator, and a 12-b digital latch, forming a pipeline from which a new conversion result is readout every 50 {mu}s. The data conversion scheme implements a programmable compression curve, which is stored as a look-up table in an off-chip, digital memory. In addition to the lookup table, data conversion requires an off-chip digital-to-analog converter, both of which may be shared by any number of CRIC`S. The CRIC was fabricated using a 3-{mu}m, n-well BiCMOS process, and occupies a die area of 5.1 mm {times} 7.5 mm. It operates at 10 MHz, consumes 440 mW from {+-}5-V supplies, and has a demonstrated input-referred noise performance of 2.2 {mu}V rms i.e., 1,400 e{sup {minus}} on 100 pF of shunt capacitance.
- OSTI ID:
- 72810
- Journal Information:
- IEEE Journal of Solid-State Circuits, Vol. 30, Issue 5; Other Information: PBD: May 1995
- Country of Publication:
- United States
- Language:
- English
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