SHF Communication Technologies AG
Wilhelm-von-Siemens-Str. 23D • 12277 Berlin • Germany
Phone +49 30 772051-0 • Fax +49 30 7531078
E-Mail: sales@shf.de • Web: http://www.shf.deDatasheet
SHF 78210 A
Synthesized Signal Generator

SHF reserves the right to change specifications and design without notice – SHF 78210 A - V004 – June 12, 2012

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Description
The Synthesized Signal Generator SHF 78210 A was developed to provide our BERT system customers
with a suitable internal clock source for their 100G Ethernet test applications, at reasonable cost. W ith afrequency range from 24 GHz to 32 GHz all bit rates of interest are covered. The output power can bevaried between 0 dBm and +6 dBm in 0.1 dB steps.
For measurement purposes, the SHF 78210 A provides a trigger signal at a quarter of the clock output
frequency.
Optionally, a jitter injection functionality can be added to the signal generator module. Arbitrary jitter types
may be applied to the clock signal using an external signal source, enabling various test scenarios such asserial data protocol compliance testing.

FeaturesOutput clock frequency ranges from fCLK = 24 to 32 GHz

Output power adjustable from 0 to +6 dBm in 0.1 dB steps with an accuracy better than 0.1 dB

Computer controlledIntegrates seamlessly in the SHF BERT system hardware and software environmentOperated using the BERT Control Center GUI running on a PCOptions
Option J1 (Jitter Injection)
Enables injection of arbitrary jitter types by applying an external modulation signal up to 1 GHz
bandwidth with a maximum jitter amplitude of 90 ps peak-to-peak. A jitter-free trigger signal isavailable for measurement and calibration purposes.

Option T2 or T4 (Half Clock or Quarter Clock Trigger)
The frequency configuration of the Trigger Out clock may be fixed at either fCLK /2 (Option T2 Half Clock Trigger) or at fCLK /4 (Option T4 - Quarter Clock Trigger).
Note that the trigger remains jitter-free even if jitter injection is enabled.

Specifications – SHF 78210 A
Parameter

Unit

Min.

Operating Frequency

GHz24

Frequency Resolution

MHz

Output Power Level

dBm

Spurious Signals

dBc

SSB Phase NoisedBc/HzTyp.

Max.

Comment32fCLK+61.85 mm (V) maleClock Output (RF Out)

10-20
tbd

SHF reserves the right to change specifications and design without notice – SHF 78210 A - V004 – June 12, 2012

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Trigger Out
Frequency (Option T2)

GHz

1216fCLK /2

Frequency (Option T4)

GHz

68fCLK /4

Output Amplitude

mVpp

550

650

SMA female

Modulation Bandwidth

MHz

0.1

1000

External Modulation
Amplitude

mVpp

01000

SMA female

ps090

Peak-to-peak

Jitter Injection (Option J1)

Jitter Amplitude
GeneralWeightkg

3.3

Dimensions

mm

59x213x450

Power Consumption

W12

Operating Temperature°C10w/o Front PanelConnector
35Block Diagram
SHF 78210 A
RF Synthesizer
Trigger Out

fCLK /N*Tunable DelayLine (optional)

fCLKRF Out
fCLK = 24 to 32 GHz

External Modulation* If option T2 is chosen, N=2 (half clock). If T4 is chosen, N=4 (quarter clock).

SHF reserves the right to change specifications and design without notice – SHF 78210 A - V004 – June 12, 2012

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Graphical User Interface

Typical Output Signal Waveforms

24 GHz at +6dBm

32 GHz at +6dBm

SHF reserves the right to change specifications and design without notice – SHF 78210 A - V004 – June 12, 2012

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Jitter Injection Option
The SHF 78210 A jitter injection feature is designed to apply arbitrary jitter modulation to the high-speed
clock signal. Jitter is injected by connecting a signal source such as an arbitrary waveform generator to theexternal modulation input. Internally, the time delay of a tunable delay line is modulated. The maximum
jitter amplitude is 90 ps peak-to-peak with a modulation bandwidth of up to 1 GHz. As an example, thejitter amplitude of 90 ps corresponds to a relative jitter amplitude of 2.5 unit intervals (UI) at a bitrate of28 Gbit/s.
The specifications of the external signal source are given in the table below for sinusoidal jitter injection.
Depending on the user’s jitter injection requirements, an arbitrary waveform generator may be used for
maximum flexibility of the available jitter types. Several examples of jittered clock waveforms using anarbitrary waveform generator are shown in the next section.

Recommended Minimum Specifications of the External Signal Source Required for Injection ofSinusoidal JitterParameter

UnitMin.

Frequency RangeMHz0.11000Amplitude

mVpp01000

Connector TypeTyp.

Max.

SMAFor jitter calibration purposes, the trigger signal of the SHF 78210 A remains jitter-free even if jitter
injection is applied to the RF out signal.
In combination with the SHF bit pattern generator series 1210X A, the SHF 78210 A including the jitter
injection feature enables a complete test solution for jitter tolerance tests as required by many
telecommunication standards such as 100G Ethernet and 40 GBit/s OTN, FibreChannel, InfiniBand,PCI Express®, and Serial ATA. For further details please refer to the SHF application note „Jitter Injection
using the Multi- Channel BPG“, available online at www.shf.de.

 InfiniBand is a registered trademark of the InfiniBand Trade Association. PCI Express is a registeredtrademark of Peripheral Component Interconnect Special Interest Group (PCI-SIG).
SHF reserves the right to change specifications and design without notice – SHF 78210 A - V004 – June 12, 2012

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Typical Jittered Signal Waveforms
The external modulation input can be driven by a function generator such as the Agilent 332XX family offunction / arbitrary waveform generators (AWG). The waveform characteristics of the AWG determine the jitter
type of the SHF 78210 A.

Sinusoid on Modulation Input
SHF 78210 ATrigger

Jittered ClockRF Output

ExternalModulation

Output waveform from AWG

AWG Setting
Waveform
Frequency
Amplitude

Sinusoid
100 kHz
70 mVpp

Sinusoidal jitter on 28 GHz clock,jitter amplitude 11 ps peak-to-peak

Gaussian-Distributed Noise on Modulation Input

AWG Setting
Waveform
Amplitude

Noise
70 mVpp

Random jitter on 28 GHz clock,jitter amplitude 1.7 ps rms

SHF reserves the right to change specifications and design without notice – SHF 78210 A - V004 – June 12, 2012

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Square Waveform on Modulation Input
SHF 78210 ATrigger
Jittered ClockRF Output

External
Modulation

Output waveform from AWG

AWG Setting
Waveform
Frequency
Amplitude

Square100 kHz
70 mVpp

Peak-to-peak jitter on 28 GHz clock,jitter amplitude 11 ps peak-to-peak

As an example, the following diagram shows the peak-to-peak jitter amplitude in ps versus the modulation
signal amplitude in mVpp for the special case of sinusoidal jitter of 100 kHz frequency modulated onto a28 GHz clock using a function generator of the Agilent 332XX family.

Sinusoidal Jitter Amplitude
Peak-to-Peak Jitter Amplitude [ps]Jitter Frequency 100 kHz, Clock Frequency 28 GHz
5028 Gbit/s eye
completely closed
due to jitter

4540
35
30
25
20
1510
50050

100
150
200
250
Modulation Signal Amplitude [mVpp]

300350

SHF reserves the right to change specifications and design without notice – SHF 78210 A - V004 – June 12, 2012

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