Amptek Charge Sensitive Preamplifiers and Front End Electronics

Your complete source for high performance preamplifiers and amplifiers

Selection Guide

Charge Sensitive Preamplifiers

A250CF CoolFET

Noise @ 0 pF: 670 eV FWHM (Si)T
~76 electrons RMS

Noise Slope: 13 eV/pF with low Ciss FET
11.5 eV/pF with high Ciss FET

Fast Rise Time: 2.5 ns

Features of the COOLFET:

• Thermoelectrically Cooled FET
• 3 internal FETs to match detector
• Lowest Noise and Noise Slope
• AC or DC coupling to the detector
• Both Energy and Timing outputs
• Optional input protection
• Easy to use

A250

Features of the A250:

• External FET
• FET can be cooled
  
• Noise: <100 e- RMS (Room Temp.)
  <20 e- RMS (Cooled FET)
  
• Gain-Bandwidth fT>1.5 GHz
  
• Power: 19 mW typical
  
• Slew rate: >475 V/µs

Description of the A250:

The A250 has been called "the best preamplifier in the world", because it can be adjusted by the user to perfectly match the detector characteristics, reduce noise, and maximize performance in every application.

A225

Features of the A225 Charge Sensitive
Preamplifier & Shaper:

• Preamplifier: Noise <280 electrons RMS; Rise time 20ns
• Shaper: 2.5µs peaking time; Sensitivity 5V/picocoulomb

Description of the A225:

• Analog mode with: Solid state detector and Proportional counters
• Will accept high capacitance detectors

A203

Features of the A203 Charge Sensitive
Preamplifier & Shaper:

• Preamplifier: Noise 900 electrons RMS; Rise time 50 ns
• Shaper: 300 ns Peaking time; Sensitivity 5V/picocoulomb; Unipolar and bipolar outputs available

Description of the A203:

Analog mode with: Solid state detectors, Proportional counters, Photomultiplier tubes, and Channel Electron Multipliers.

Preamplifier/Discriminators

A121

Features of the A121:

• Sensitivity: 5x104 electrons
• Voltage controlled threshold
• 12MHz periodic
• Analog monitor output
• Adjustable pulse width

Description of the A121:

Fast pulse counting mode with: Microchannel plates, Channel Electron Multipliers, Low gain PMTs, Proportional counters, and Solid state detectors

A111

Features of the A111 Charge Sensitive Preamplifier & Discriminator
Sensitivity: 5x104 electrons

• Variable threshold
• TTL output
• 2.5MHz periodic
• Analog monitor output
• Externally adjustable discrimination level

Description of the A111:

Pulse counting mode with: Low gain photomultiplier tubes, Proportional counters, and Microchannel plates (MCP)

A101

Features of the A101 Charge Sensitive Preamplifier & Discriminator

• Sensitivity: 1x106 electrons
• Variable threshold
• TTL and open collector output
• 4MHz periodic
• Externally adjustable discrimination levels
  and pulse width

Description of the A101:

Pulse counting mode with: Photomultiplier tubes (PMT), Channel Electron Multipliers (CEM)

Pulse Shaping Amplifiers

A275

Features of the A275:

• Low noise (4nV/√Hz)
• Ultra low power (15mW)
• High slew rate (100V/µs)
• Wide band (ft=200MHz)

Differential input, configurable as a shaping
amplifier with adjustable gain and time
constants

Description of the A275:

Used for gain and shaping with the A250 or other charge preamps.

A206

Features of the A206 Pulse Amplifier and Discriminator:

• Amplifier: 10x gain
• Discriminator: Sensitivity 50mV
• 200kHz periodic
• Externally adjustable low level discrimination levels and pulse width

Description of the A206:

To follow a pulse shaper (A203, A225) for 10x gain and provide low level discrimination

Baseline Restorer

BLR1

Description of the BLR1:

Baseline Restorer Restores baseline in high counting rate applications For use with the A275, A203, A225

Peak Hold Detector

PH300

Features of the PH300:

• Low power (<30mW)
• Low droop rate (<1µV/µs)
• Fast analog rise time (200ns)

Description of the PH300:

To hold the peak of the analog pulse and interface with Analog to Digital converters. Both Wilkinson type and successive approximation ADC can be accommodated. To be used with the A275, A225, A203 or any other pulse amplifier.