德国进口FEMTO高频电荷放大器HQA-15M-10T

特点

High Gain of 10 V/pC

Wide Operating Range from 250 Hz to 15 MHz

Low Input Noise of 40 x 10-21 C/√Hz and 700 pV/√Hz

Optimized for Sinusoidal Signals from AC Coupled Charge Sources

应用

Pyro- and Piezoelectric Detectors

Tuning Fork Quartz Crystals

Length Extension Resonators

Atomic Force Microscopy

Optical Measurements

Charged Particle Beam Monitoring

技术参数

测试条件                         Vs = ±15 V, Ta = 25 °C

电荷增益                         10 V/ PC       （@≥1MΩ负载）

等效电流增益                     1.6 V /μA      （@1MHz的正弦输入信号）

增益精度                         ±3％

带宽下限截止频率(−3 dB)           250 Hz

带宽上限截止频率(−3 dB)           15 MHz (with max. 100 pF source capacitance)

输入阻抗                         1 GΩ || 10 nF

有效的AC输入阻抗               20 Ω            (@ 1MHz)

输入电荷噪声                     40 x 10-21 C/√Hz  (@ 1 MHz, with open input)

                                 90 x 10-21 C/√Hz  (@ 1 MHz, with 100 pF source capacitance)

General

The amplifier is AC coupled for direct use with a charge sensor producing sinusoidal signals with no DC background. A source capacitance of less than 1 nF is recommended for proper operation. If the effective source capacitance (sensor plus cable capacitance) is small relative to the effective input impedance of the amplifier (10 nF) the amplifier acts as a virtual ground and most of the charge flows into the amplifier input. At 1 MHz the amplifier input capacitance of 10nF corresponds to a complex input impedance of 20 Ω. An input resistor of 1 GΩ is incorporated to prevent buildup of static charge. The amplifier is not suited for sources producing an average DC background current as this would saturate the device.

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