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-communication.com • Web: www.shf-communication.com

Datasheet
SHF C711 A50 GHz / 64 Gbps
22 dB Variable Dual Analog RF Attenuator

SHF reserves the right to change specifications and design without notice – SHF C711 A - V002 – December 01, 2020 Page 1/10

Description
The SHF C711 A is a dual analog broadband RF attenuator, operating form 40 kHz up to 50 GHz for clock
signal, and up to 64 Gbps for NRZ Data signal. It offers high quality output signals together with a compact
size and ease of operation.
The two attenuators are fully independent RF building blocks, so essentially two attenuators are operated
by single software and housed in a single chassis as indicated by the block diagram below. It operates inboth directions, i.e. the signal can be applied to or taken from the RF ports.
Attenuation values can be set with a calibrated resolution of ±0.1 dB within a 22 dB dynamic range.

FeaturesBroadband operation up to 50 GHz
Up to 64Gbps NRZ Data signal
Calibrated attenuation settings
High attenuation resolution
Attenuation of differential signals
Bi-directional
Low power consumption
Single-ended operation
USB interface
Simple, easy to use GUI
1
Automated measurements by using different software environments easily possible

Applications


Broadband test and measurement equipment

Block Diagram

1To operate the switch, intuitive and well documented plain text commands are sent and received via USB. Thus the device can beoperated either by the complementary software or automated by any programming language which can communicate with USB devices.
SHF reserves the right to change specifications and design without notice – SHF C711 A - V002 – December 01, 2020 Page 2/10

Accessories
 Functional earth cable Mini-USB cable

Absolute Maximum Ratings
Parameter

Unit

SymbolInput Power

dBm

Pin

External DC Voltage on
RF Ports

V

VDCext

Min.

Typ.

Max.

Comment

Input Parameters30-6+6AC coupled ports

Max.

Comment40

Clock Signal

Specifications – SHF C711 A
Parameter

Unit

SymbolMinimum Input Frequency

kHzfminMaximum Input Frequency

GHzfmax

Data RateGbps

Attenuation RangedB

Attenuation Resolution

dBMin.

Typ.

Performance

50Clock Signal

64

Data Signal
220.1

Attenuation Accuracy

TBDInsertion Loss @ min att.

dB

467.5

whole frequency range

Insertion Loss @ max att.

dB

26

28

29

whole frequency range

Return Loss @ min att.

dB

610

< 50 GHz, RF A1

Return Loss @ min att.

dB

610

< 50 GHz, RF A2

Return Loss @ max att.

dB

710

< 50 GHz, RF B1

Return Loss @ max att.

dB

1216

< 50 GHz, RF B2

SHF reserves the right to change specifications and design without notice – SHF C711 A - V002 – December 01, 2020 Page 3/10

Parameter

UnitSymbol

Min.

Typ.

Max.

CommentJitter RMS

fsJRMSSee note

Duty Cycle%

DCSee note

Inter-Channel Skew

ps

Output Parameters
221

Power Requirement
Supply Voltage

VVcc

Supply Current

mAIcc

20

Power Dissipation

mW

Pd

100

@ VCC = +5 V

+4.40+5.00+5.25

Mini USB

Mechanical Characteristics
Attenuator A RF A1Ω

50

1.85 mm (V) female

Attenuator A RF A2Ω

50

1.85 mm (V) female

Attenuator B RF B1Ω

50

1.85 mm (V) female

Attenuator B RF B2Ω

50

1.85 mm (V) female

Dimensions

mmWeightgSee Outline Drawing
90Conditions
Operating Temperature

2°CTambient

1535No degradation in jitter or duty cycle performance were observed for sine wave signals

SHF reserves the right to change specifications and design without notice – SHF C711 A - V002 – December 01, 2020 Page 4/10

Typical RF Performance @ +25°C
The measurements below had been performed using a VNA.

Insertion Loss vs. attenuation

Insertion Loss @ min attenuation

SHF reserves the right to change specifications and design without notice – SHF C711 A - V002 – December 01, 2020 Page 5/10

Return Loss (RF A1/B1) @ min / max attenuation

Return Loss (RF A2/B2) @ min / max attenuation

SHF reserves the right to change specifications and design without notice – SHF C711 A - V002 – December 01, 2020 Page 6/10

Typical Output Waveforms
Clock Output Signals
The measurements below had been performed using an Anritsu signal generator (3697C) and an Agilent
Digital Communication Analyzer (DCA) with a Precision Timebase Module (86107A) and a 70 GHzSampling Module (86118A). The outputs of the Switch module had been connected directly to the DCA
input. Input power of the clock signal is 0 dBm (630 mVpp).

5 GHz input signal

5 GHz output signal @ min attenuation

50 GHz input signal

50 GHz output signal @ min attenuation

SHF reserves the right to change specifications and design without notice – SHF C711 A - V002 – December 01, 2020 Page 7/10

Data Output Signals
31

The measurements below had been performed using a SHF 12105 A Bit Pattern Generator (PRBS 2 -1)
and an Agilent Digital Communication Analyzer (DCA) with a Precision Timebase Module (86107A) and a70 GHz Sampling Module (86118A). The outputs of the Switch module had been connected directly to the31
DCA input. Input Data amplitude is ~630 mVpp, and it is a PRBS 2 -1 signal.

10 Gbps input signal

10 Gbps output signal @ min attenuation

10 Gbps output signal @ max attenuation

SHF reserves the right to change specifications and design without notice – SHF C711 A - V002 – December 01, 2020 Page 8/10

64 Gbps input signal

64 Gbps output signal @ min attenuation

64 Gbps output signal @ max attenuation

SHF reserves the right to change specifications and design without notice – SHF C711 A - V002 – December 01, 2020 Page 9/10

Outline Drawing – Moduleacb
Ø2.2

40
34
284x
Ø

2.7

Att A
RF A2RF A1

1RF B2RF B1

34

SHF C711 A

35455451
4535

2

Att B

Dual Analog RF AttenuatorXXXXX

SHFCommunication
Technologies AG

3USB

23.5

6.4Connector

1

RF A1 Att A 1.85mm (V) female2

RF A2 Att A 1.85mm (V) female3

RF B1 Att B 1.85mm (V) female

4RF B2 Att B 1.85mm (V) female

13.6

Port

13.6Pos6.4

All dimensions are in mmPortConnectoraMini-USBbncc

Functional earth (FE)SHF reserves the right to change specifications and design without notice – SHF C711 A - V002 – December 01, 2020 Page 10/10