Amptek 电荷灵敏前段放大器
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Amptek Hybrid
Selection Table (Specifications Subject to
Change Without Notice)
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Model
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Description
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Characteristics
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Applications
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Charge Sensitive
Preamplifier & Discriminator
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Sensitivity: 1x106
electrons; Variable threshold; TTL and open
collector output; 4MHz periodic; Externally
adjustable discrimination levels and pulse width
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Pulse counting
mode with: Photomultiplier tubes (PMT), Channel
Electron Multipliers (CEM)
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Charge Sensitive
Preamplifier & Discriminator
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Sensitivity: 5x104
electrons; Variable threshold; TTL output;
2.5MHz periodic; Analog monitor output;
Externally adjustable discrimination level
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Pulse counting
mode with: Low gain photomultiplier tubes,
Proportional counters, and Microchannel plates
(MCP)
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12MHz Preamplifier
Discriminator
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Sensitivity: 5x104
electrons; Voltage controlled threshold; 12MHz
periodic; Analog monitor output; Adjustable
pulse width
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Fast pulse
counting mode with: Microchannel plates, Channel
Electron Multipliers, Low gain PMTs,
Proportional counters, and Solid state detectors
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Charge Sensitive
Preamplifier & Shaper
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Preamplifier:
Noise 900 electrons RMS; Rise time 50ns
Shaper: 300ns Peaking time; Sensitivity 5V/picocoulomb; Unipolar and bipolar outputs available |
Analog Mode with:
Solid state detectors, Proportional counters,
Photomultiplier tubes, and Channel Electron
Multipliers
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Pulse Amplifier &
Discriminator
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Amplifier: 10x
gain
Discriminator: Sensitivity 50mV; 200kHz periodic; Externally adjustable low level discrimination levels and pulse width |
To follow a pulse
shaper (A203, A225) for 10x gain and provide low
level discrimination
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Charge Sensitive
Preamplifier & Shaper
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Preamplifier:
Noise <280 electrons RMS; Rise time 20ns
Shaper: 2.5µs peaking time; Sensitivity 5V/picocoulomb |
Analog mode with:
Solid state detector and Proportional counters
Will accept high capacitance detectors |
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Charge Sensitive
Preamplifier
"State-Of-The-Art" |
External FET to
match detector characteristics, allows cooling
of input FET; Rise time <2.5ns; Noise <100
electrons RMS at +20 °C, <20 electrons RMS with
cooled FET
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All possible
detectors can be connected to the A250 since the
input FET is external and sensitivity is
variable.
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. |
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Pulse Amplifier
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Low noise
(4nV/ÖHz); 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
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Used for gain and
shaping with the A250 or other charge preamps
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Pulse Amplitude
Discriminator
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Tunnel diode snap
action discriminator; Complementary CMOS
outputs; 5MHz periodic; Externally adjustable
discrimination level and pulse width
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To follow a pulse
shaper (A203, A225, A275) for accurate level
discrimination
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Baseline Restorer
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Restores baseline
in high counting rate applications
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For use with the
A275, A203, A225
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Peak-Hold Detector
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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; Low power (<30mW); Low droop rate
(<1µV/祍); Fast analog rise time (200ns)
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To be used with
the A275, A225, A203 or any other pulse
amplifier
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