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 804 EABroadband Amplifier

Specifications – SHF 804 EAParameter

SymbolUnit

MinHigh frequency 3 dB point

fHIGH

GHz45

Low frequency 3 dB point

fLOWkHzGain

GpdB19Gain control voltage
current

Ugc
Igc

VmA00

Gain ripple∆GpdB±1Temperature coefficient

Tc

dB/°C-0.05

Noise figure

NFdB6at 5 GHz

ps±50>5GHz, <45GHz
with 100 MHz apertureGroup delay

TypMaxConditions

302021

non-inverting-5-10

reduces gain by up to3 dB±1.5

Output power at 1 dBcompression

P01dBdBm
V

12.5
2.5

<35 GHz

Output power at 2 dBcompression

P02dB

dBm
V

14.5
3.3

<35 GHz

Output power at 3 dBcompression

P03dB

dBm
V

15.5
3.7

<35 GHz

Jitterfs650

see page 6
deconvoluted
in the output range
between 2 and 3 V-12-10<10 GHz<35 GHz

Input return loss

S11dB

Output return loss

S22dB-10<45 GHzdBm

410in operation
without power supply

820%...80%

150.25 A, reverse
voltage protected

Maximum input power
Rise time/fall time

tr/tf

-15

800700ps

6Supply voltage

V6Power consumptionW

1.5using 6 V supply
voltage

Input connector

1.85mm V female

Output connector

1.85mm V female

Dimensions

mm

51x35x13.5
excluding connectors

The SHF 804 EA is a modulator driver suitable for driving electro-absorption modulators. In addition to highperformance, the amplifier is extremely easy to use: a single power supply is all that is needed for operation.
A two stage amplifier design is employed using special 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 specially tuned for minimum passband ripple. A voltage regulator
IC makes the amplifier insensitive to reverse voltage and line ripple.
SHF reserves the right to change specifications and design without notice – SHF 804 EA – Rev. 2.1 – 25/MAR/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 804 EA – Rev. 2.1 – 25/MAR/2004

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Eye diagrams at 44 Gbps

Input signal amplitude: 65 mV

Output signal amplitude: 720 mV

Input signal amplitude: 200 mV

Output signal amplitude: 2.0 V

Input signal amplitude: 330 mV

Output signal amplitude: 3.0 V

SHF reserves the right to change specifications and design without notice – SHF 804 EA – Rev. 2.1 – 25/MAR/2004

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Eye diagrams at 2.5 Gbps

Input signal amplitude: 68 mV

Output signal amplitude: 809 mV

Input signal amplitude: 210 mV

Output signal amplitude: 2.35 V

Input signal amplitude: 345 mV

Output signal amplitude: 3.3 V

SHF reserves the right to change specifications and design without notice – SHF 804 EA – Rev. 2.1 – 25/MAR/2004

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Jitter and rise time measurements at 44 Gbps
Input signal

Input jitter: 376 fs
Input rise time: 10.0 ps
Output signal

Output jitter: 660 fs
Output rise time: 10.0 ps
The specification for jitter is based on the measurement using a 63 GHz sampling module andprecision time base. The figure of <800 fs specified on page 2 is not deconvoluted from the total
system jitter; it is the figure displayed on the oscilloscope for the whole system (multiplexer, amplifier,sampling head and oscilloscope).
To deconvolute the jitter, we use the following formula:amplifier jitter = [(total jitter)2 - (input signal jitter)2]½This yields a jitter value of <700 fs.

SHF reserves the right to change specifications and design without notice – SHF 804 EA – Rev. 2.1 – 25/MAR/2004

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Low frequency response (<1 MHz)

Saturation power
SN 4183

Ouput Power (dBm)

18

17

16

15

14

1305

1015

20

25

30

35

40

Frequency (GHz)Top (red): 3 dB compression; Middle (black): 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 804 EA – Rev. 2.1 – 25/MAR/2004

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4244
44,5Power
supplyOutputOutput Bias-T(Optional)

Gain
Control

Input

Input Bias-T(Optional)

Top view

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

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

4,8
7,15
10,6
13,5

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

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

4,9
16,5

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

42All dimensions in mm

33235

Bottom view

The following options cannot be combined:
01 and 02
03 and 04
02 and 04

M2,5x5 (4x)

MP: Matches the phase of two amplifiers

3148
51

SHF reserves the right to change specifications and design without notice – SHF 804 EA – Rev. 2.1 – 25/MAR/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 6…15 V, 0.5 A DC power supply and can beconnected to the supply feed-through filter via an ON / OFF switch.

4.

The minimum supply voltage is 6 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 50 GHz (V/ 1.85mm attenuators)!

6.

An input signal of about 0.5 Vpp equivalent to -2 dBm will produce saturated output swing of3.5Vpp.

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 levelaccording 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 1 Vpp equivalent to 4 dBm input power.
The input voltage without DC power supplied to the amplifier should never be greater than 2 Vppequivalent to 10 dBm input power.
11. Hint: Pulse shape tuning of the amplifier has been performed after warm up at about 35°C casetemperature. Slightly more over and undershoot will be present at low temperature!

SHF reserves the right to change specifications and design without notice – SHF 804 EA – Rev. 2.1 – 25/MAR/2004

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