SHF Communication Technologies AG
Wilhelm-von-Siemens-Str. 23 • Aufgang D • 12277 Berlin – Marienfelde • Germany
Phone ++49 30 / 772 05 10 • Fax ++49 30 / 753 10 78
E-Mail: sales@shf.biz • Web: http://www.shf.biz

Datasheet
SHF 824
Broadband Amplifier

Specifications – SHF 824
Parameter

SymbolUnit

Min

TypHigh frequency 3 dB point

fHIGH

GHz2831

Low frequency 3 dB point

fLOWkHz

GaindB

16

Gain control voltage
current

VmA

00

Gain rippledBMax

Conditions

2530

1718

non-inverting-5-10

reduces gain by up to3 dB±1±1.5

Output power at 1 dBcompression

P01dB

dBm
(V)

25 (11.2) 26 (12.6)
23 (9)
24 (10)<15 GHz<20 GHz

Output power at 2 dBcompression

P02dBdBm(V)

25.5(11.9)

26.5(13.3)<15 GHz

Output power at 3 dBcompression

P03dB

dBm
(V)

26 (12.6) 27 (14.2)<15 GHz

Input return loss

S11dB-10<28 GHz

Output return loss

S22dB-10<28 GHzdBm

1414in operation
without power supply

2020%...80%

120.75 A, reverse
voltage protected

Maximum input power
Rise time/fall timetr/tf

ps16

Supply voltage

V11Power consumptionW

8.3

using 11 V supply
voltage

Input connector

2.9 mm / K female

Output connector

2.9 mm / K female

Dimensions

mm51x40x16
excluding connectors

The SHF 824 is a two stage amplifier custom-design monolithic microwave integrated circuits(MMICs) inside special carriers to achieve ultra wide bandwidth and low noise performance. The
custom made MMIC carrier is optimized for good input return loss between its interior and the 50
Ohm outside hybrid technology. The computer optimized broadband circuit is designed forminimum passband ripple to get a near Bessel response. A voltage regulator IC makes theamplifier insensitive to overvoltage and line ripple.
Potential applications:This amplifier is well suited for applications requiring extra amplitude drive level than conventional
NRZ intensity modulation, for data rates at 20 GBit/s and above. The potential area of interest is
the investigation of novel modulation techniques to further enhance the spectral efficiency andimprove the resilience of signal propagation against fibre nonlinearities. Some of thesetechniques, for example, optical phase duobinary, and optical phase modulation by using a chirpfree Mach Zehnder modulator, require 2 Vπ amplitude drive level to achieve the full benefits.

SHF reserves the right to change specifications and design without notice – SHF 824 – Rev. 2.2 – 26/APR/2004

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S-Parameters, group delay and phase response at maximum gain

Aperture of group delay measurement: 100 MHz

SHF reserves the right to change specifications and design without notice – SHF 824 – Rev. 2.2 – 26/APR/2004

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Eye diagrams at 40 GBit/s

Input signal amplitude: 570 mV

Output signal amplitude: 3.7 V

Input signal amplitude: 1.3 V

Output signal amplitude: 8.0 V

Input signal amplitude: 1.8 V

Output signal amplitude: 10.4 V

SHF reserves the right to change specifications and design without notice – SHF 824 – Rev. 2.2 – 26/APR/2004

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Eye diagrams at 20 GBit/s

Input signal amplitude: 185 mV

Output signal amplitude: 1.4 V

Input signal amplitude: 1.4 mV

Output signal amplitude: 9.7 V

Input signal amplitude: 1.9 V

Output signal amplitude: 11.8 V

SHF reserves the right to change specifications and design without notice – SHF 824 – Rev. 2.2 – 26/APR/2004

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Eye diagrams at 2.5 Gbps

Input signal amplitude: 200 mV

Output signal amplitude: 1.4 V

Input signal amplitude: 1.4 mV

Output signal amplitude: 9.6 V

Input signal amplitude: 2.0 V

Output signal amplitude: 11.9 V

SHF reserves the right to change specifications and design without notice – SHF 824 – Rev. 2.2 – 26/APR/2004

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Low frequency response (<1 MHz)

Step response

system rise time measured as 27 ps, giving a deconvoluted amplifier rise time of 15.2 ps.

SHF reserves the right to change specifications and design without notice – SHF 824 – Rev. 2.2 – 26/APR/2004

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Saturation power

Top (red): 3 dB compression; Middle (green): 2 dB compression; Bottom (blue): 1 dB compression

Gain reduction function

All SHF amplifiers have a feature which allows the output gain to be reduced by up to approximately
3dB by applying a negative voltage to the gain reduction pin.

SHF reserves the right to change specifications and design without notice – SHF 824 – Rev. 2.2 – 26/APR/2004

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40
Gain
Control

47
49
49,5 (SHF106P: 52,4)

Powersupply

OutputOutput Bias-T(Optional)
Input Bias-T(Optional)

02: Built-in bias tee on input (max. ±12 V,max. 220 mA)

Input

01: DC return on input (max. ±1.75 V,max. 35 mA)

Top view

 Available Options

03: DC return on output (max. ±1.75 V,max. 35 mA)

MP: Matches the phase of two amplifiers

7,39,613,116

MT: Special tuning available to optimize
performance with E/O modulatorsPositive gain slope of up to +3 dB
possible

Side view

04: Built-in bias tee on output (max. ±12V, max. 220 mA)

4,916,534,837
40

M2,5x5 (4x)3Bottom view

The following options cannot becombined:
01 and 02
03 and 04
02 and 04

3148
51

SHF reserves the right to change specifications and design without notice – SHF 824 – Rev. 2.2 – 26/APR/2004

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User Instructions
ATTENTION !
Electrostatic sensitive GaAs FET amplifier1.

To prevent damage through static charge build up, cables should be always discharged before
connecting them to the amplifier!

2.

Attach a 50 Ohm output load before supplying DC power to the amplifier!

3.

The supply voltage can be taken from any regular 11…12 V, 0.8 A DC power supply and can beconnected to the supply feed-through filter via an ON / OFF switch.

4.

The minimum supply voltage is 11 V. A higher one increases the power dissipation of the internal
voltage stabilizer.

5.

Using a 3 dB or 6 dB input attenuator will result in a 6 dB or 12 dB increase of the input returnloss. For minimal degradation of amplifier rise time, these attenuators should have a bandwidth
specification of greater than 40 GHz (K/ 2.9mm attenuators)!

6.

An input signal of about 2.5 Vpp equivalent to 12 dBm will produce saturated output swing of
12.6Vpp.

7.

Higher input voltages will drive the amplifier’s output stage into saturation, leading to waveformpeak clipping.

8.

Saturated output voltages can only be used between 10 MHz and 40 GHz without damage while
the amplifier is connected to a 50 Ohm precision load with a VSWR of less than 1.2 or better than
20 dB return loss up to 26 GHz.

9.

While using a reflective load the output voltage has to be reduced to a safe operating level below
12.6 Vpp according to the magnitudes of the reflections.
ATTENTION: At frequencies up to 20 GHz a capacitive load can be transformed to an inductive
one through transmission lines! With an output stage driven into saturation this may lead to theimmediate destruction of the amplifier (within a few ps)!

10. The input voltage should never be greater than 3 Vpp equivalent to 14 dBm input power.
11. Hint: Pulse shape tuning of the amplifier has been performed after warm up at about 35°C casetemperature. Considerably more over and undershoot will be present at low temperature!

SHF reserves the right to change specifications and design without notice – SHF 824 – Rev. 2.2 – 26/APR/2004

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