XPS: A multi-channel preamplifier shaper IC for X-ray spectroscopy

Conference · Sat Nov 01 04:00:00 EST 1997

OSTI ID:666027

Krieger, B; Kipnis, I; Ludewigt, B A

An integrated circuit featuring 48 channels of charge-sensitive preamplifiers followed by variable-gain pulse shaping amplifiers is being developed as part of an x-ray spectrometer with a highly segmented detector to handle high fluxes in synchrotron experiments. Such detector systems can provide excellent energy resolution combined with one-dimensional spatial information. The IC combines many basic spectroscopy amplifier functions with a low-noise preamplifier section to produce a unique circuit capable of driving conventional ADC modules directly. An important feature of the design is the novel CR-RC{sup 2} pulse shaper. In this section, high-linearity transconductor circuits are required in order to provide a broad range of continuously variable peaking times while still maintaining the linearity and noise performance necessary for x-ray spectroscopy. Reported here are first measurements made on the performance of a 16-channel prototype integrated circuit. At present, the preamplifier-shaper circuit achieves an equivalent input noise of 26 electrons rms at 2 {micro}s peaking time with a 0.2 pF external capacitor, which is similar to the capacitance of a single detector element. The design was fabricated in standard 1.2 {micro}m CMOS technology.

• Research Organization: Lawrence Berkeley National Lab., Engineering Div., Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 666027
• Report Number(s): LBNL--39990-Rev.; CONF-971147--; ON: DE98056093
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
ANALOG-TO-DIGITAL CONVERTERS
INTEGRATED CIRCUITS
PREAMPLIFIERS
PULSE SHAPERS
X-RAY FLUORESCENCE ANALYSIS
X-RAY SPECTROMETERS