Data Sheet SHF C653 A
SHF Communication Technologies AG

Data SheetSHF C653 A

120 Gbps Limiting Amplifier

SHF reserves the right to change specifications and design without notice
V001 - Dez. 14, 2023 - Page 1

Data Sheet SHF C653 A
SHF Communication Technologies AGDescription
The SHF C653 A is a RoHS compliant limiting amplifier which operates at data rates up to 120 Gbps and withclock signal up to 70 GHz for use in broadband test setups and telecom transmission systems. The AC-coupled
differential inputs can be driven single-ended by terminating the unused input. For input signals >150 mV theoutput voltage will be clipped to 600 mV.

Features•

Supports data rates up to 120 GBit/s•

Supports clock frequencies up to 70 GHz•

Output amplitude control•

Output crossing control•

Output signal speed (trim) control•

Single ended or differential operation (either In or In! or both can be used)•

600 mV single ended output swing

Applications•

100GbE, 200GbE, 400GbE and 1TbE system evaluation & development•

Telecom transmission•

Broadband test and measurement equipment

Accessories•+5 V Power Supply Desktop Adapter•

Functional Earth Cable → Connection to test setup ground has to be set up first before any otherconnection to prevent instrument damage!

•Mini-USB cable

SHF reserves the right to change specifications and design without notice
V001 - Dez. 14, 2023 - Page 2

Data Sheet SHF C653 A
SHF Communication Technologies AG

Block Diagram
SHFC653 A
InOut

Limiting
Amplifier
InOutMini-USB+5V

FE

Specifications
Absolute Maximum Ratings
Parameter

UnitSymbol

RF Input Voltage

mVVin

External DC Voltage on
RF Input Ports

VVDCinExternal DC Voltage on
RF Output PortsVDC Supply Voltage

Min

TypMaxComment900

Peak-to-PeakSingle-ended-6+6AC coupled input

VDCout-6+6AC coupled output

VVcc0+6Parameter

Unit

SymbolMin

Minimum Data Rate

Gbps

Rin,minMaximum Data Rate

Gbps

Rin,max

120

Input VoltagemVpp

Vclk in150

Unit

SymbolMin

Input Parameters
TypMaxComment

1850

Peak-to-PeakSingle ended

TypMaxComment

450

500600> 64 GBaud

530

600700≤ 64 GBaud

Output Parameters
Parameter

Output Voltage

mVVoutOutput Jitter, RMS value

fsJrmsSmall Signal GaindBGp

Eye Amplitude,
Single-ended,
Adjustable up to -10 dB
5002325800
Tambient=25°C

SHF reserves the right to change specifications and design without notice
V001 - Dez. 14, 2023 - Page 3

Data Sheet SHF C653 A
SHF Communication Technologies AG

Power Requirements
Parameter

Unit

SymbolMin

TypMaxComment

Supply Voltage

V

VCC+4.8+5.2

2.5 x 0.7 mm DC Power Jack

Supply CurrentmA

Iee

280

Power Dissipation

WPd

1.4Parameter

Unit

SymbolInput Connectors

Ω50

1.85 mm (V) female

Output Connectors

Ω501.85 mm (V) female

Dimensions

mmWeightg300@ VCC = +5VMechanical Characteristics
Min

TypMaxCommentSee page 12
90Conditions
ParameterUnit

SymbolMin

Operating Temperature°C

Tambient

15

TypMaxComment35

SHF reserves the right to change specifications and design without notice
V001 - Dez. 14, 2023 - Page 4

Data Sheet SHF C653 A
SHF Communication Technologies AG

Remote Interface & Software
The Limiting Amplifier is controlled by the easy-to-use software package SHF Control Center (SCC). The
amplitude, crossing, output signal speed (trim) and the RF output state (on/off) can be set and are displayedin the graphical user interface (GUI).

GUI – SHF Control Center SCC

SHF reserves the right to change specifications and design without notice
V001 - Dez. 14, 2023 - Page 5

Data Sheet SHF C653 A
SHF Communication Technologies AGTypical Output Eye Diagrams
Output Signal Measurement
The measurements below had been performed using a SHF C603 B Mux (PRBS 231-1) and a Tektronix DSA
8300 Digital Serial Analyzer with Phase Reference (82A04B-60G) and 70 GHz Sampling Module (80E11). The
input of the module is driven single ended. The outputs of the module had been connected directly to theDSA input.

Input @ 120 GbpsOutput @ 120 Gbps

Output inv. @ 120 Gbps

Input @ 100 Gbps

Output @ 100 Gbps

Output inv. @ 100 Gbps

Input @ 80 Gbps

Output @ 80 Gbps

Output inv. @ 80 Gbps

Input @ 64 Gbps

Output @ 64 Gbps

Output inv. @ 64 Gbps

SHF reserves the right to change specifications and design without notice
V001 - Dez. 14, 2023 - Page 6

Data Sheet SHF C653 A
SHF Communication Technologies AG

Input @ 32 Gbps

Output @ 32 Gbps

Output inv. @ 32 Gbps

Input @ 10 Gbps

Output @ 10 Gbps

Output inv. @ 10 Gbps

SHF reserves the right to change specifications and design without notice
V001 - Dez. 14, 2023 - Page 7

Data Sheet SHF C653 A
SHF Communication Technologies AG

Output Amplitude Adjustment
The measurements below had been performed using a SHF C603 B Mux (PRBS 231-1) and a Tektronix DSA
8300 Digital Serial Analyzer with Phase Reference (82A04B-60G) and 70 GHz Sampling Module (80E11). The
input of the module is driven single ended. The output of the module had been connected directly to the DSA
input with a 6 dB attenuator.

64 Gbps @ 600 mV

64 Gbps @ 500 mV

64 Gbps @ 400 mV

64 Gbps @ 300 mV64 Gbps @ 200 mV

64 Gbps @ 100 mVSHF reserves the right to change specifications and design without notice
V001 - Dez. 14, 2023 - Page 8

Data Sheet SHF C653 A
SHF Communication Technologies AG

Output Signal Speed (Trim) – Adjustment
The measurements below had been performed using a SHF 12105 A BPG (PRBS 231-1) and a Tektronix DSA
8300 Digital Serial Analyzer with Phase Reference (82A04B-60G) and 70 GHz Sampling Module (80E11). The
input of the module is driven single ended. The output of the module had been connected directly to the DSA
input with a 6 dB attenuator.

50 Gbps @ TRIM = 100 %50 Gbps @ TRIM = 80 %50 Gbps @ TRIM = 60 %50 Gbps @ TRIM = 40 %50 Gbps @ TRIM = 20 %50 Gbps @ TRIM = 0 %SHF reserves the right to change specifications and design without notice
V001 - Dez. 14, 2023 - Page 9

Data Sheet SHF C653 A
SHF Communication Technologies AGOutput Signal Crossing – Adjustment
The measurements below had been performed using a SHF 12105 A BPG (PRBS 231-1) and a Tektronix DSA
8300 Digital Serial Analyzer with Phase Reference (82A04B-60G) and 70 GHz Sampling Module (80E11). The
input of the module is driven single ended. The output of the module had been connected directly to the DSA
input with a 6 dB attenuator. A maximum Crossing adjustment range can be achieved at a max. input
amplitude of 150 mV. With increasing the input amplitude the range of the crossing adjustment will bereduced.

50 Gbps @ CROSSING = -100

50 Gbps @ CROSSING = -50

50 Gbps @ CROSSING = 050 Gbps @ CROSSING = 50

50 Gbps @ CROSSING = 100

SHF reserves the right to change specifications and design without notice
V001 - Dez. 14, 2023 - Page 10

Data Sheet SHF C653 A
SHF Communication Technologies AG

Typical Measurement Results
Data Input Sensitivity
The measurements shown below had been performed using a SHF C603 B Mux (PRBS 231-1), a SHF 11104 A
Error Analyzer, a Tektronix DSA 8300 Digital Serial Analyzer with Phase Reference (82A04B-60G) and 70 GHz
Sampling Module (80E11) to determine the data input eye height. The input of the module is driven single
ended. The input signal had been reduced until a BER limit of <10-9 had been achieved.

Output Voltage
The measurements shown below had been performed using a SHF 78122 B Signal Generator, an Agilent
86100B DCA with Precision Time Base Module (86107A) and a 70 GHz Sampling Head (86118A) to determine
the output amplitude. The input of the module is driven single ended. The output of the module had beenconnected directly to the DSA input with a 6 dB attenuator.

SHF reserves the right to change specifications and design without notice
V001 - Dez. 14, 2023 - Page 11

Data Sheet SHF C653 A
SHF Communication Technologies AG

Typical S-Parameters

S-Parameter measurements @ Pin = -30 dBm

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V001 - Dez. 14, 2023 - Page 12

Data Sheet SHF C653 A
SHF Communication Technologies AG

Mechanical Drawingabc

Ø2.2

40
34
284xInOutInOut

12435
45
54

3514535

Ø2.7

SHF C653 ALimiting AmplifierXXXXXSHF Communication
Technologies AG

3USB+5 V DC

23.5

PortConnector

1In1.85 mm (V) female

2Out

1.85 mm (V) female

3In

1.85 mm (V) female

4Out

1.85 mm (V) female

6.4

13.6

Pos

13.66.4

All dimensions are in mmPortConnector

DesignationaMini-USB

Control Interfaceb

Power Jack 2.5 x 0.7 mm+5 Vc2 mm Banana Jack

Functional EarthSHF reserves the right to change specifications and design without notice
V001 - Dez. 14, 2023 - Page 13

Data Sheet SHF C653 A
SHF Communication Technologies AG

SHF Communication Technologies AG
Wilhelm-von-Siemens-Str. 23 D | 12277 Berlin | Germany+49 30 772 051 0
sales@shf-communication.com
www.shf-communication.com

SHF reserves the right to change specifications and design without notice
V001 - Dez. 14, 2023 - Page 14