Cremat's CR-110 is a single channel, low noise charge sensitive preamplifier intended for use with various types of radiation detectors including semiconductor detectors, photomultiplier tubes (PMTs), photodiodes, avalanche photodiodes (APDs), and various gas-based detectors. The CR-110 is small (less than one square inch in area), allowing for compact multichannel detection systems to be created using a modular design. The CR-110 can provide equal performance with pulses of either polarity.
The CR-110 can be used either in a direct coupled (DC) mode, or an AC coupled mode. These configurations are discussed below. If the detector current exceeds 10 nA, it is recommended that an AC coupled mode be used to prevent the resulting DC offset of the preamplifier output from saturating.
Direct coupled operation
The above figure illustrates a typical configuration in which the CR-110 preamplifier is used to readout a detector in a 'DC coupled' configuration. Detector current flows directly into the preamplifier input, which is held at approximately a couple tenths of a volt below ground potential. Detector current also produces an offset in the preamplifier output voltage at a rate of 0.2 V per nA. A DC coupled configuration is recommended unless high detector current causes the DC level at the output to saturate.
In cases in which detector current exceeds approximately 10 nA, an AC coupled configuration is recommended to prevent the DC level of the output from saturating. The above figure shows the connections typically made in such a situation.
The CR-110 circuit is contacted via an 8-pin SIP connection (0.100" spacing). Leads are 0.020 inches wide. Pin 1 is marked with a white dot for identification.