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While some of the RoentDek electronic devices are similar to other commercial products they will at least have special features optimized for the main purpose: reading out the different RoentDek detectors. This requires tailoring the response specifications. The RoentDek FAMP signal amplifiers, for example, can be tuned to different gain ranges, bandwidths and even be operated at varying impedance. This allows optimizing amplifying characteristics for any demand found in other applications.

Some of RoentDek’s electronic devices even have unique features, allowing unsurpassed performance. An example is the fADC4 unit which achieves much higher throughput for applications where distinct pulse traces shall be recorded/digitized and processed. A special firmware on the internal FPGA board selects and addresses only the relatively short pulse trace data for transfer to the CPU, ignoring the voids of “noise” data between pulses that contain no relevant information. This significantly enhances data transfer speeds compared to ungated transfer, see figure below.

The RoentDek constant-fraction discriminators (CFD) have a variety of controls so that any kind of pulse signal can be processed and turned into a logic signal describing its arrival time. ALL CFD set parameters (including “fraction ratio”) can be individually selected. Both analog and digital “walk” output signals are monitored for optimal adjustment. Moreover, the CFDx version of the circuit can additionally code signal pulse height into time delay so that pulse height information can be recorded together with signal time. Our CFDs can be gated in time e.g. to block unwanted signals.




Right figure: input signal pulse height (red arrow) is a linear function of CFDx signal width (middle trace) and of delay to “stop” signal (lower trace).



The RoentDek TDCs are among the fastest and most precise time-to-digital converters available on the market. Their special feature is that several units can be synchronized to cope with a large number of channels and they can even be synchronized with fADC4 units. Additional external signals/parameters such as trigger pulses and DC levels can be included in the data stream (TDC8HP). The novel cTDCX can even operate with analog signal inputs making CFD electronics obsolete if amplifiers with bipolar output signals (RoentDek BFAMP) are used.