Pulse detection electronics

Cremat's pulse detection electronics can be used with a wide range of detector types, including pin photodiodes, avalanche photodiodes, photomultiplier tubes (PMTs), surface barrier/PIPS detectors, scintillator-photodiode detectors, CdTe and CZT (CdZnTe) semiconductor radiation detectors, or gas-based detectors (MWPC, proportional tubes, He3, BF3, etc.).

All product specifications can be found at this web site, as well as application notes describing their best use.

An overview of our product line is presented below.

Product Overview

Charge sensitive preamplifier products:

Our principal line of products are our charge sensitive preamplifier modules, which are small 8-pin single in-line package (SIP) epoxy-coated, single channel circuits less than 1 square inch in size.

To make it easier for our customers to evaluate Cremat's line of charge sensitive preamplifiers, we began offering the CR-150-R5 charge sensitive preamplifier evaluation board. The CR-150-R5 has an 8-pin socket to accept a preamplifier module, as well as BNC connectors for the preamplifier output, test input, and detector bias input. This new version has a jack for a wall-mounted power supply.

Because Cremat's charge sensitive preamplifiers are relatively sensitive, care must be taken to shield the active electronics from the usual ambient RF interference. To make it easier for our customers to shield the CR-150-R5 evaluation board, we introduced the CR-150-BOX-R5, which is a diecast aluminum housing designed to accept and fully shield the CR-150-R5 board.

We offer a 24V wall mounted power supply which powers the CR-150-R5 evaluation board. Included are blade adapters which allow the use of this power supply internationally.

For those that want a fully assembled instrument, Cremat offers the CR-Z line of charge sensitive preamplifier instruments. At the heart of the instrument is a Cremat CSP module.

Shaping amplifier products:

Shaping amplifiers are used to transform the shape of the pulses produced by charge sensitive preamplifiers to make the pulses Gaussian-shaped (bell shaped), while also improving signal-to-noise as well as providing an overall gain for the signals. Cremat's line of shaping amplifier modules provide this shaping in a small package. Similar to Cremat's line of charge sensitive preamplifiers, the CR-200 series are 8-pin single in-line package (SIP) epoxy-coated, single channel circuits less than 1 square inch in size. They come in 9 different shaping times from 25ns to 8us.

The CR-210 is a baseline restorer (BLR) circuit, developed to correct for the natural baseline depression at the shaping amplifier output occurring during high count rates. Use of the CR-210 BLR circuit will allow for higher resolution spectroscopic measurements, particularly in cases where there are high or varying count rates. This module should be implemented at the output of the shaping stage (CR-200-X).

The CR-160-R7 evaluation board allows customers to evaluate the CR-200 line of shaping amplifier modules and the CR-210 baseline restoration module. The CR-160-R7 evaluation board provides 8-pin sockets to accept these modules, as well as input and output BNC connectors, and banana-style connectors to provide the necessary +/-12V power. There are also switchable on-board amplifier stages to further amplify the signals, if necessary, as well as provisions to invert the signals, and trimpots to adjust the fine gain, output offset, and pole/zero.

The CR-160-BOX-R2 is a painted and labeled diecast aluminum housing designed to contain the CR-160-R7 evaluation board. The CR-160-BOX-R2 provides a convenient and organized housing for the CR-160-R7 board if needed.

The CR-S-XX instrument is an assembled shaping amplifier. Each assembled instrument consists of a Cremat CR-200-X series shaping amplifier module and a CR-210 baseline restoration module mounted on a CR-160-R7 evaluation board, inside an aluminum housing. The shaping time of the instrument can be changed by swapping out the internal CR-200 module for that of another shaping time. A power supply is included with the CR-S instrument.