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Accessories

PAM 102

Pre-Amplifier Module

  • Fast rise time / wide bandwidth
  • Low jitter
  • Ideal for low output fast photon detectors like MCP and PMT
  • 3 dB bandwidth up to 1.8 GHz
  • Gain up to 25 dB
  • Gain flatness of ± 1.0 dB
  • P1dB up to 10 dBm
  • Overload indicator

The PAM 102 pre-amplifier is specially targeted at timing sensitive applications such as Time-Correlated Single Photon Counting (TCSPC) with fast photon detectors like Microchannel Plate PMTs (MCP) or standard PMTs. Such detectors produce very small output pulses with extremely short pulse widths, usually too small for direct interfacing with TCSPC electronics or other counters.

Amplifier parameters matched to common detector types

PAM 102 - Frequency responseThe pulse rise times (or fall times) of fast photon detectors are typically 150 ps to 500 ps, and the pulse widths (FWHM) are correspondingly small. Therefore, an amplifier with an appropriately fast rise time is needed between the detector and the timing discriminator of the TCSPC system. The rise time of an amplifier is directly related to its bandwidth. A fast rise time corresponds to a wide bandwidth. On the other hand, the wider the bandwidth, a pre-amplifier contributes more electronic noise to the signal. All amplitude noise on the signal adds to the timing jitter, when the signal is processed by a timing dicriminator of the TCSPC electronics. This is because the signal is not infinitely steep and any fluctuation in amplitude will be translated to a timing uncertainty inversely proportional to the steepnes dV/dt of the timing edge of the signal. There are, therefore, contradicting demands for the selection of the appropriate amplifier bandwidth. Best timing resolution is usually achieved when the amplifier rise time is comparable to the detector rise time. For common modern detectors this corresponds to an optimum amplifier bandwidth of 1 GHz to 2.5 GHz as used in the PAM 102.

Different pre-amplifier for different detector types

The PAM 102 is available in three different versions: Non-inverting, 25 dB Gain version for PMTs (P-version) and MCP-PMTs (M-version). Those two version differ in the threshold level for the overload protection signal. Another option is the 18 dB inverting version for PMTs (T-version). All PAM 102 come with a wide range input (110-240V AC) power supply unit. Signal input and output are standard 50 Ohms SMA connectors. The housing is gold plated for maximum RF immunity.


  PAM 102-T PAM 102-P PAM 102-M
Puls polarity inverting non-inverting non-inverting (for MCP-PMTs)
Gain 18 dB 25 dB 25 dB
Bandwidth 1.1 GHz 1.8 GHz 1.8 GHz
1 dB compression + 9 dBm + 10 dBm + 10 dBm
Overload threshold - 100 µA - 100 µA - 0.1 µA
Input
Amplitude 100 mV max.
Connectors, input & output
Type 50 Ohm SMA female
Power Supply
Line voltage 110/240 VAC 50/60 Hz
Power consumption max. 0.8 Watts
Physical
Dimensions 62 × 51 × 27 (w × d × h)

Typical pulse response after a PMT detector

PAM 102 - Impulse response of typical PMT

Typical frequency response

PAM 102 - Frequency response


All Information given here is reliable to our best knowledge. However, no responsibility is assumed for possible inaccuracies or omissions. Specifications and external appearances are subject to change without notice.

The following documents are available for download: