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 C652 A67 GHz
1:2 Clock Buffer

SHF reserves the right to change specifications and design without notice – SHF C652 A - V001 – June 08, 2021

Page 1/6

Description
The SHF C652 A 1:2 Clock Buffer operates at frequencies up to 67 GHz and can be used in broadband
test setups and telecom transmission systems. The AC-coupled differential input can also be driven
single-ended by terminating the unused port. This renders the device perfectly suited to generate two inphase differential copies of the input clock signal. In a typical application the single input is split to clock
and synchronize four further modules.
For single ended input signals >150 mV the output voltage will be clipped to a fixed output voltage. All RF
in- and output ports are AC-coupled and internally terminated with 50 Ohm to GND. Unused in- or output
ports should be terminated with 50 Ohm.

Features

Broadband operation up to 67 GHz
Two differential output ports
Single ended or differential operation (either In or In! or both can be used)

Applications





Clock signal amplification
Splitting one clock signal into 2 differntial output signals
100G Ethernet development and prototyping
OC-768 / STM-256 applications
Telecom transmission
Fibre Channel®
Broadband test and measurement equipment

Block Diagram

InInSHF
C652 A

Out2

Out2

Out1

1:2
Clock
BufferMini-USB(Service only)+5V

Out1FEAccessories1
 +5V 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!

®
1Fibre Channel is a registered trademark of the Fibre Channel Industry Association
Mini-USB port is only for service purposes, no USB cable will be provided

SHF reserves the right to change specifications and design without notice – SHF C652 A - V001 – June 08, 2021

Page 2/6

Absolute Maximum Ratings
Parameter

Unit

SymbolClock Input Voltage

mVVclk inExternal DC Voltage on
RF Input PortsVVDCin

External DC Voltage onRF Output PortsV

DC Supply Voltage

Min.

Typ.

Max.

Comment

900

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

VDCout-6+6AC coupled output

VVcc0+6Unit

SymbolMin.

Minimum Input FrequencyMHz

fin minMaximum Input Frequency

GHz

fin max

67

Clock Input VoltagemVpp

Vclk in150

Input Parameters

Specifications
Parameter

Typ.

Max.

CommentInput Parameters
12850

Peak-to-Peak;Single-ended

Output Parameters

Clock Output Voltage≤ 50 GHz> 50 GHz
Peak-to-Peak;Single-ended;
See page 4400
280600
400

4.8

5.0

5.2400mVpp

Vout

Supply VoltageVVcc

Supply CurrentmAIee

370

Power Dissipation

WPd

1.85@ VCC = +5V

50

1.85 mm (V) female

Power Requirements
2.5 x 0.7 mm
DC Power Jack

Mechanical CharacteristicConnectors

Ω

Dimensions

mmWeightgsee page 6
90Conditions
Operating Temperature

2°C

Tambient

1535

Small signal bandwidth of the module is ~30 GHz

SHF reserves the right to change specifications and design without notice – SHF C652 A - V001 – June 08, 2021

Page 3/6

Typical Output Voltage

Fig.1: Output voltage @ Vin = 200 mVpp

Typical S-Parameters

Fig.2: S-Parameter measurements @ Pin = -30 dBm
SHF reserves the right to change specifications and design without notice – SHF C652 A - V001 – June 08, 2021

Page 4/6

Typical Output Waveform
The measurements below had been performed using an Agilent 86100B DCA with Precision Time Base
Module (86107A) and 70 GHz Sampling Head (86118A). The outputs of the clock buffer module had beenconnected by 6 dB attenuators to the DCA input.

Output Signal @ fin= 70 GHz

Output Signal @ fin= 67 GHz

Output Signal @ fin= 60 GHz

Output Signal @ fin= 50 GHzOutput Signal @ fin= 32 GHz

Output Signal @ fin= 10 GHz

SHF reserves the right to change specifications and design without notice – SHF C652 A - V001 – June 08, 2021

Page 5/6

Outline Drawing – ModuleØ
2b ca40
28
104x
Ø2.7

13.6

12.4

13.6

InIn
Out1

Out2

SHF C652 A
1:2 Clock Buffer

Out2

Out1

3

SHF Communication
Technologies AG

23.7

USB

35455451
4535

XXXXX

+5 V DC

34PortConnector

In1.85mm (V) female

In1.85mm (V) female

Out1

1.85mm (V) female

Out11.85mm (V) female

aMini-USB

Out21.85mm (V) femalebPowerOut2

1.85mm (V) femalecFunctional earth (FE)

13.6

Connector

13.6

Port

all dimensions in mm

SHF reserves the right to change specifications and design without notice – SHF C652 A - V001 – June 08, 2021

Page 6/6