Preliminary Datasheet

HQA-15M-10T

High Frequency Charge AmplifierFeatures

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High Gain of 10 V/pC
Wide Operating Range from 250 Hz to 15 MHz-21
Low Input Noise of 40 x 10 C/√Hz and 700 pV/√HzOptimized for Sinusoidal Signals from AC Coupled Charge Sources

Applications

yyyyyyPyro- and Piezoelectric Detectors
Tuning Fork Quartz Crystals
Length Extension Resonators
Atomic Force Microscopy
Optical Measurements
Charged Particle Beam Monitoring

Specifications

Test Conditions

Vs = ± 15 V, Ta = 25°C

Charge Gain
Equivalent Current Gain
Gain Accuracy

10 V/C61.6 x 10 V/A±3%GainBandwidthInput

13Lower Cut-Off Frequency (-3 dB) 250 Hz
Upper Cut-Off Frequency (-3 dB) 15 MHz
Input Impedance
Effective AC Input Impedance
Input Charge Noise

1 GΩ // 10 nF
20 Ω @ 1MHz
-21
40 x 10 C/√Hz-21
90 x 10 C/√Hz
Equivalent Input Current Noise
250 fA/√Hz(@ 1 MHz sinusoidal input signal) 570 fA/√Hz
Input Voltage Noise700 pV/√Hz
Max. Input Charge
1 pC peak-peak(@ 1 MHz sinusoidal input signal)(with max. 100 pF source capacitance)(with open input)(with 100 pF source capacitance)(with open input)(with 100 pF source capacitance)(@ 1 MHz)

OutputOutput Voltage Range
Output ImpedanceIntegrated Broadband Noise

10 V peak-peak(@ ≥ 1 MΩ load, for linear operation)
50 Ω (terminate with ≥ 1 MΩ load for best performance)
typ. 20 mV peak-peak or 3.5 mV rms (@ ≥ 1 MΩ load)

Power Supply

Supply Voltage
Supply Current± 15 V± 35 mA typ. (depends on operating conditions,recommended power supply capability min. ± 100 mA)

CaseWeightMaterial

200 g (0.44 lb.)
AlMg4.5Mn, nickel-plated

Temperature Range

Storage Temperature
Operating Temperature- 40 °C to +100 °C+20 °C to +40 °C

SOPHISTICATED TOOLS FOR SIGNAL RECOVERYDE-HQA-15M-10T_R1/R1/SP/08MAR2010/ Page 1 of 3

Preliminary Datasheet

HQA-15M-10T

High Frequency Charge Amplifier
Absolute Maximum Ratings

Input Voltage
Power Supply Voltage

1 V peak-peak± 18 V

Connectors

Input

BNC

Output

BNC

Power Supply

LEMO series 1S, 3-pin fixed socket
Pin 1:+ 15V
Pin 2:- 15V
Pin 3:GND
PIN 2-Vs

PIN 1+VsPIN 3GND

Operation

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 groundand most of the charge flows into the amplifier input. At 1 MHz the amplifier input
capacitance of 10 nF corresponds to a complex input impedance of 20 Ω. An input resistorof 1 GΩ is incorporated to prevent buildup of static charge. The amplifier is not suited forsources producing an average DC background current as this would saturate the device.

SOPHISTICATED TOOLS FOR SIGNAL RECOVERY
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Preliminary Datasheet

HQA-15M-10T

High Frequency Charge Amplifier
Dimensions

94.0 mm87.0 mm74.0 mm

HQA-S

OUT
51.0 mm

44.0 mmINPOWER

27.0 mm∅ 3.2 mm

DZ01-2299001-R1

FEMTO Messtechnik GmbHPaul-Lincke-Ufer 34
D-10999 Berlin x Germany
Tel.: +49 (0)30 – 4 46 93 86
Fax: +49 (0)30 – 4 46 93 88
e-mail: info@femto.de
http://www.femto.deSpecifications are subject to change without notice. Information furnished herin is believed tobe accurate and reliable. However, no responsibility is assumed by FEMTO MesstechnikGmbH for its use, nor for any infringement of patents or other rights granted by implicationor otherwise under any patent rights of FEMTO Messtechnik GmbH. Product names
mentioned may also be trademarks used here for identification purposes only.
© by FEMTO Messtechnik GmbH
Printed in GermanySOPHISTICATED TOOLS FOR SIGNAL RECOVERYPage 3