SHF Communication Technologies AG
Wilhelm-von-Siemens-Str. 23D • 12277 Berlin • Germany
Phone ++49 30 / 772 05 10 • Fax ++49 30 / 753 10 78
E-Mail: sales@shf.de • Web: http://www.shf.deDatasheet
SHF 804 TL
Broadband Amplifier

Specifications – SHF 804 TL
Parameter

SymbolUnit

Min

High frequency 3 dB point

fHIGH

GHz55

Low frequency 3 dB point

fLOWkHz

Gain

s21dB

TypMax

Conditions

2002122

non-inverting(measured at -20dBm inputpower)

Gain control voltage
current

Ugc
Igc

VmA

Gain ripple∆s21dB±1Temperature coefficient

TcdB/°C-0.05

Noise figure

NFdB6at 5 GHz

ps±50>5GHz, <45GHz
with 104 MHz apertureGroup delay

00-5-10

reduces gain by up to3 dB±1.5

Output power at 1 dBcompression

P01dB

dBm
Vpp

12.5
2.5

<35 GHz

Output power at 2 dBcompression

P02dB

dBm
Vpp

14.5
3.3

<35 GHz

Output power at 3 dBcompression

P03dB

dBm
Vpp

15.5
3.7

<35 GHz

Jitterfs650

700

deconvoluted
in the output range
between 2 and 3 V

Input return loss

S11dB-10-7<40 GHz

Output return loss

S22dB-10-7<40 GHz410in operation
without power supply

820%...80%

120.3 A, reverse voltage
protectedMaximum input power
Rise time/fall timedBmtr/tf

ps6

Supply voltage

V6Power consumptionW

1.8using 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 TL is a transmission-line optimised version of the SHF 804EA modulator driver. In addition tohigh performance, the amplifier is extremely easy to use: a single power supply is all that is needed foroperation.
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 TL – V003 – 03. September 2008 Page 2/7

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

Aperture of group delay measurement: 104 MHz

SHF reserves the right to change specifications and design without notice – SHF 804 TL – V003 – 03. September 2008 Page 3/7

Eye diagrams at 80 Gbps

Input signal amplitude: 385 mV

Output signal amplitude (Eye Amp): 3.2 V

Eye diagrams at 44 Gbps

Input signal amplitude: 330 mV

Output signal amplitude (Eye Amp): 3.7 V

Eye diagrams at 2.5 Gbps

Input signal amplitude: 340 mV

Output signal amplitude (Eye Amp): 3.8 V

SHF reserves the right to change specifications and design without notice – SHF 804 TL – V003 – 03. September 2008 Page 4/7

Low frequency response (<1 MHz)

Saturation power
SN 4183

Ouput Power (dBm)

181716151413051015202530

3540

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 TL – V003 – 03. September 2008 Page 5/7

7911,3
Input

Gain
Control35

PowersupplyOutputOutput Bias-T(Optional)
Input Bias-T(Optional)

Bottom view

11,37

 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)

30
4,87,15
10,613,5

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

MT: Special tuning available tooptimize performance with
E/O modulators (positivegain slope of up to +3 dB
possible).

16,54251

32
3

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

Top view

MP: Matches the phase of two
amplifiers

3148
Thermal resistance of heatsink approx. 5 K/W
For permanent mounting remove the heat sink from the amplifier.
In that case please ensure that adequate cooling of the amplifier
is guaranteed.
To remove the heat sink from the amplifierunscrew the four screws on the heat sink.

SHF reserves the right to change specifications and design without notice – SHF 804 TL – V003 – 03. September 2008 Page 6/7

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…12 V, 0.3 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 of
3.5Vpp.

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 40 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 50 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 TL – V003 – 03. September 2008 Page 7/7