Datasheet

HCA-200M-20K-C
High Speed Current Amplifier

Featuresyyyy

Bandwidth DC ... 200 MHz
4Transimpedance (Gain) 2 x 10 V/A
Suitable for Source Capacitance up to 8 pF
Low Equivalent Input Noise Current of 4.9 pA/√HzApplications

yyyyy

Photodiode and Photomultiplier Amplifier
Spectroscopy
Charge Amplifier
Ionisation Detectors
Preamplifier for Lock-Ins, A/D Converters, etc.

Specifications

Test Conditions

Vs = ± 15 V, Ta = 25°C

Gain

TransimpedanceGain Accuracy

2 x 10 V/A (@ 50 Ω load)±2%Frequency ResponseLower Cut-Off Frequency
DCUpper Cut-Off Frequency (- 3 dB) 200 MHz
170 MHzMax. Source Capacitance
8 pF
Rise / Fall Time (10 % - 90 %)1.9 ns2.2 nsGain Flatness± 0.3 dB4(± 10 %, @ Csource 2 to 4 pF)(± 10 %, @ Csource 5 to 8 pF)(incl. cable, e.g. typical coax cable 1 pF/cm)(@ Csource 2 to 4 pF)(@ Csource 5 to 8 pF)

Input

Equ. Input Noise Current
Equ. Input Noise Voltage
Equ. Integrated Noise
Input Bias Current
Input Bias Current Drift
Offset Current Compensation
Input Current RangeInput Offset Voltage
DC Input Impedance

4.9 pA/√Hz (@ 10 MHz)
0.9 nV/√Hz (@ 10 MHz)
1.0 µA peak-peak
12 µA typ.
3 nA / °C± 100 µA adjustable by offset trimpot± 60 µA (for linear amplification)< 1 mV56 Ω (virtual) // 5 pF

OutputOutput Voltage Range
Max. Output Voltage Range
Output Impedance± 1.2 V(@ 50 Ω load)
for linear operation and low harmonic distortion± 1.7 V(@ 50 Ω load)
50 Ω (terminate with 50 Ω load for best performance)

Bias Output Voltage Range
Bias Output Impedance± 12 V, adjustable by bias trimpot
10 kΩ // 1 µF

Bias Output

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Datasheet

HCA-200M-20K-C
High Speed Current Amplifier

Specifications (continued)
Power Supply

Supply Voltage
Supply Current± 15 V± 50 mA typ.
(depends on operating conditions, recommended
power supply capability minimum ± 150 mA)

Case

WeightMaterial

210 g (0.5 lbs)
AlMg4.5Mn, nickel-platedTemperature Range

Storage Temperature
Operating Temperature-40 ... +100 °C
0 ... +60 °C

Absolute Maximum Ratings

Input Voltage
Power Supply Voltage±5V± 22 VConnectors

Input
OutputPower Supply

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

PIN 1+Vs
PIN 3
GND

Application Diagrams

Photo Detector Biasing in Photoconductive Mode:
Best choice for high speed applications andoptimum signal to noise performance.

U se ad ditio na l
Bypa ss C ap acitor
clo se to D e te ctor(~ 10 0 n F, C e ra m ic)

STA BIL IZ E DBIA S VOLTAG E
O U TP U THCA

CURRENTIN P U T

H ig h -Spe e dC u rren t to Vo ltag eC o nve rter

I/UC o nn ect the D e te cto r
a s close as p ossible
to th e A m plifier.

+1 2 VBIA S
1 0 kΩ
4 70 nF-1 2 VA Z0 1 -0 2 0 1 -2 0

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Datasheet

HCA-200M-20K-C
High Speed Current Amplifier

Typical Performance
Characteristics

Frequency Response

Noise Spectrum

Note: Spectral noise data is measured at the amplifier output with open but shielded input.
To determine the spectral input noise divide the measured output noise by the amplifier gain
4of 2 x 10 V/A, i.e.:MarkerFrequency

Output Noise

Resulting Input Noise⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯1
210 MHz
200 MHz

97 nV/√Hz
208 nV/√Hz

4.9 pA√Hz
10.4 pA√Hz

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Datasheet

HCA-200M-20K-C
High Speed Current Amplifier

Typical Performance
Characteristics(continued)

Pulse Response to Square Wave Input Signal(with 16 times averaging)

Large Signal Response
output signal for 100 MHz, 50 µA peak-peak input signal(with 4 times averaging)

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Datasheet

HCA-200M-20K-C
High Speed Current Amplifier

Typical Performance
Characteristics(continued)

Small Signal Response
output signal for 1 MHz, 1 µA peak-peak square wave input signal(without (top) and with 64 times averaging (bottom))

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Datasheet

HCA-200M-20K-C
High Speed Current Amplifier

Dimensions

94 mm
87 mm

15 mm

74 mm

OUT

12 mm

51 mm

HCA44 mmINPOWER

22 mm∅ 3.3 mm

27 mm

14 mm

41 mm

DZ01-0201-22

FEMTO Messtechnik GmbHKlosterstr. 64D-10179 Berlin x Germany
Tel.: +49-(0)30-280 4711-0
Fax: +49-(0)30-280 4711-11
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 Germany

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