HSA-X	HSA-Y

Features

• Ultra-wide bandwidth from 10 kHz up to 2.5 GHz
• Gain up to 60 dB (x 1,000)
• Transimpedance gain with photodetectors up to 50,000 V/A
• Very low input noise down to 310 pV/√Hz (6.2 pA/√Hz)
• Integrated DC-current path for biased photodetector applications
• Two identical signal outputs (HSA-Y series)
• DC-monitor output (HSA-Y series)

 

10 KHZ TO 2.5 GHZ

The HSA high-speed amplifiers offer a well-balanced combination of high gain, low noise and ultra-wide bandwidth making them ideal for time-resolved measurements e.g. with fast photodetectors. Wide bandwidth from kilohertz to gigahertz is very important for accurate pulse and transient measurements, especially if signals with different pulse lengths and varying decay times are processed. The outstanding HSA wide band performance is completed by the very low 1/f noise corner ensuring a true low noise performance even down to the kHz range.
Wide bandwidth, flat frequency response and low noise make the HSA amplifier series also a perfect choice for significantly increasing the sensitivity of common spectrum/network analyzers.

 

INPUT DC PATH FOR PHOTODETECTOR BIAS CURRENTS

In many photodetector applications - e.g. shot-noise-limited spectroscopy, heterodyne measurements etc. - the detector is subject to relatively high cw-power generating a high level DC background current. This DC current must "see" a low impedance path to ground, otherwise the photodetector would be back-biased resulting in significant distortions and speed limitations. All the HSA amplifiers provide a well matched 50 Ohm DC path to ground using a sophisticated coil system very similar to a so-called Bias-T design. This greatly simplifies the use of biased photodetectors together with the HSA amplifiers.

 

HSA-X

The HSA-X comes in a compact, very high quality EMI shielded case with threaded M4 and 8-32 mounting holes and is equipped with SMA input and output connectors. Various models with fixed gain of either 20 or 40 dB are available.

 

HSA-Y

In addition to the features of the HSA-X the HSA-Y is equipped with a DC-monitor output useful for photodetector alignment or cw-power control or for the measurement of low frequency background signals. Furthermore, the HSA-Y features two identical signal outputs enabling signal control or triggering without the need for an external signal splitter. The HSA-Y series offers various models with a fixed gain of either 20, 40 or 60 dB.

 

Applications

• Preamplifier for ultra-fast detectors (microchannel plates, photomultipliers, avalanche photodiodes and PIN photodiodes)
• Oscilloscope and spectrum/network analyzer preamplifier
• Time-resolved pulse and transient measurements
• Signal booster in 50 Ω high-speed systems

 

Model	HSA-X-1-40	HSA-X-2-20	HSA-X-2-40	HSA-X-I-2-40
Lower Cut-Off-Frequency	10 kHz	10 kHz	10 kHz	10 kHz
Upper Cut-Off-Frequency	1.2 GHz	2.5 GHz	2.0 GHz	2.2 GHz
Rise-/Fall-Time	290 ps	140 ps	180 ps	160 ps
Gain	40 dB (x 100)	20 dB (x 10)	40 dB (x 100)	40 dB (x 100) inverting
Transimpedance*	5,000 V/A	500 V/A	5,000 V/A	5,000 V/A inverting
Input Noise [/√Hz]**	310 pV (6.2 pA)	610 pV (12.2 pA)	620 pV (12.4 pA)	430 pV (8.6 pA)
Input VSWR	1.6 : 1	1.23 : 1	1.4 : 1	1.25 : 1
Maximum Output Voltage @ 50 Ω	2 VPP	2 VPP	1.9 VPP	2 VPP
Output VSWR	1.35 : 1	1.4 : 1	2.5 : 1	1.4 : 1
Input/Output	50 Ω, SMA	50 Ω, SMA	50 Ω, SMA	50 Ω, SMA
Power Requirements	+15 V, +140 mA, typ.	+15 V, +105 mA, typ.	+15 V, +125 mA, typ.	+15 V, +145 mA, typ.
Dimensions	80 x 45 x 25 mm (L x W x H), weight 100 g (0.23 lb)
Datasheet	107 kB	107 kB	103 kB	103 kB

*  Transimpedance = Gain x 50 Ω (Input Impedance)
** Input Noise Current = Input Noise Voltage ÷ 50 Ω (Input Impedance)

Integrated DC path for use with photodetectors. 8-32 and M4 mounting threads. Power supply via 3-pin Lemo^® socket. A mating connector is provided with the device. Optional power supply PS-15 available. For further information please view the datasheet!

 

 

Model	HSA-Y-1-40	HSA-Y-1-60	HSA-Y-2-20	HSA-Y-2-40
Lower Cut-Off-Frequency	10 kHz	10 kHz	10 kHz	10 kHz
Upper Cut-Off-Frequency	1.0 GHz	1.1 GHz	2 GHz	1.9 GHz
Rise-/Fall-Time	330 ps	320 ps	175 ps	185 ps
Gain	40 dB (x 100)	60 dB (x 1,000)	20 dB (x 10)	40 dB (x 100)
Transimpedance*	5,000 V/A	50,000 V/A	500 V/A	5,000 V/A
Input	50 Ω, SMA	50 Ω, SMA	50 Ω, SMA	50 Ω, SMA
Input Noise [/√Hz]**	330 pV (6.6 pA)	330 pV (6.6 pA)	680 pV (13.6 pA)	650 pV (13 pA)
Input VSWR	1.45 : 1	1.4 : 1	1.15 : 1	1.2 : 1
Output	Two identical signal outputs, 50 Ω, SMA
Maximum Output Voltage @ 50 Ω	2.0 VPP	2.3 VPP	2.5 VPP	1.7 VPP
Output VSWR	1.6 : 1	1.4 : 1	2.5 : 1	1.8 : 1
Monitor Output	Gain: 26 dB (x 20), transimpedance*: 1 kV/A, output voltage range: ±10 V (RLoad > 10 kΩ), bandwidth: DC - 100 kHz
Power Requirements	±15 V +200 / −10 mA, typ.	±15 V +180 / −10 mA, typ.	±15 V +160 / −10 mA, typ.	±15 V +185 / −10 mA, typ.
Dimensions	110 x 70 x 25 mm (L x W x H), weight 180 g (0.41 lb)
Datasheet	183 kB	183 kB	181 kB	181 kB

*  Transimpedance = Gain x 50 Ω (Input Impedance)
** Input Noise Current = Input Noise Voltage ÷ 50 Ω (Input Impedance)

Integrated DC path for use with photodetectors. 8-32 and M4 mounting threads. Power supply via 3-pin Lemo^® socket. A mating connector is provided with the device. Optional power supply PS-15 available. For further information please view the datasheet!