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 C661 B
Adjustable Phase ShifterSHF reserves the right to change specifications and design without notice – SHF C661 B - V001 – Nov. 11, 2022

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Description
The SHF C661 B is a broadband digitally controlled phase shifter.
The phase shifter features a maximum delay of 70 ps with a 100 fs resolution. This phase-controlledoutput signal is provided at a differential output.

Features••••

Broadband 70 ps delay line with a 100 fs step size operating from 2 GHz up to 35 GHz
Controlled by intuitive graphical user interface SHF Control Center (SCC) or BERT Control Center(BCC) via USB
Differential or single-ended operation
Design features limiting amplifiersApplications••••

Computer controlled phase adjustments of clock signals up to 35 GHz
Phase margin tests
Clock signal distribution in high-speed telecom setups
Precise delay control for automated measurements

Block Diagram

SHF reserves the right to change specifications and design without notice – SHF C661 B - V001 – Nov. 11, 2022

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Remote Interface & Software
The Adjustable Phase Shifter is controlled by the easy to use software package SHF Control Center (SCC).
The adjustable Phase (“Delay”) and the used Frequency (“Frequency”) are to be set and are displayed in thegraphical user interface (GUI).

SHF Control Center (SCC)

Accessories•••+5 V Power Supply Desktop Adapter
Functional Earth Cable
Mini-USB cable

Absolute Maximum Ratings
Parameter

Unit

SymbolInput Amplitude

mVVClk inExternal DC Voltage on
RF Input PortVVDC inExternal DC Voltage on
RF Output PortsV

DC Supply Voltage

VMin.

Typ.

Max.

Comment950

Peak-to-Peak-6+6AC coupled port

VDC out-6+6AC coupled ports

Vcc

0+6Input Parameters

SHF reserves the right to change specifications and design without notice – SHF C661 B - V001 – Nov. 11, 2022

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Specifications – SHF C661 B
Parameter

Unit

Symbol

Min.

Typ.

Max.

CommentDelay
Adjustable Delayps

Step Size

fs

Absolut deviation

ps

070100
1Room Temperature

Input Frequency
CLK InGHz

fin2mVpp

Vin200GHz

foutmVpp

Supply Voltage

35Input Amplitude900

AC coupled
Single ended

235fin

Vout

450

850

AC coupled
Single ended

VVcc

+4.8

Supply Current

AIcc

1

Without heat sink

Power DissipationWPd5@ VCC = +5 V

Input Amplitude

600

Output Frequency
CLK Out
Output Amplitude
CLK Out
Power Requirement+5+5.2Mechanical Characteristics
Clock In

Ω

502.92 mm (K) female

CLK OutΩ50

2.92 mm (K) female

Dimensions

mmWeightg

See Outline Drawing
pages 9/1090417

Without heat sink
With heat sinkConditions
Operating Temperature°C

Tambient

1535

SHF reserves the right to change specifications and design without notice – SHF C661 B - V001 – Nov. 11, 2022

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Typical Output Amplitudes
The measurements below have been performed using an Anritsu signal generator (MG3697C) and anAgilent Digital Communication Analyzer (86100A) with a 70 GHz Sampling Module (86118A) and a Time
Base (86107A). The output of the module is connected directly to the DCA input with a 10 dB attenuator.
The input power of the clock signal is 0 dBm (630 mVpp). The module is driven single ended at “In” and theamplitude is measured single-ended at “Out”. The unused ports “In_b” and “Out_b” are terminated with 50Ohm.

Vpp @CLK Out
1000900800

VPP [mV]

700600500400300200
100001020fout [GHz]3040

 Tectronix is a registered trademark of Tectronix Inc.,SHF reserves the right to change specifications and design without notice – SHF C661 B - V001 – Nov. 11, 2022

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Typical RMS Jitter
The measurements below have been performed using an Anritsu signal generator (MG3697C) and anTectronix Digital Communication Analyzer (DSA8300) with a 70 GHz Sampling Module (80E11) and aTime Base (82A04B-60G). The output of the module is connected directly to the DCA input with a 10 dBattenuator. The input power of the clock signal is 0 dBm (630 mV pp). The module is driven single ended at“In” and the amplitude is measured single-ended at “Out”. The unused ports “In_b” and “Out_b” areterminated with 50 Ohm. Since the measured RMS jitter depends heavily on the input jitter and the usedmeasurement setup, the following graph is an assistance, which magnitude of jitter can be expected atdifferent delay configurations.

Typ. RMS Jitter @ 25 GHz
200

RMS JItter [fs]16012080
RMS Jitter C661 B
40
RMS Jitter meas setup
0010203040
Delay [ps]506070 Anritsu is a registered trademark of Anritsu Corporation,  Agilent is a registered trademark of Keysight Inc.

SHF reserves the right to change specifications and design without notice – SHF C661 B - V001 – Nov. 11, 2022

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Typical Output Waveforms
The measurements below are performed using an Anritsu signal generator (MG3697C) and an Agilent
Digital Communication Analyzer (86100A) with a 70 GHz Sampling Module (86118A) and a Time Base(86107A). The output of the module is connected directly to the DCA input. The input power of the clocksignal is 0 dBm (630 mVpp). The module is driven single ended at “In” and the amplitude was measured
single-ended at “Out”. The unused ports “In_b” and “Out_b” are terminated with 50 Ohm.
fout = fin

fout = fin

2 GHz output signal

8 GHz output signal

fout = fin

fout = fin

16 GHz output signal

24 GHz output signal

fout = fin

fout = fin32 GHz output signal

35 GHz output signal

 Anritsu is a registered trademark of Anritsu Corporation,  Agilent is a registered trademark of Keysight Inc.

SHF reserves the right to change specifications and design without notice – SHF C661 B - V001 – Nov. 11, 2022

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Mechanical Drawing
b c

a52.7

4x
Ø2.7

403428Out

InDelayIn514535

Adjustable
Time Delay

XXXXX

354554Out

SHF C661 B

SHF Communication
Technologies AG+5 V DC

3USBConnector

In2.82mm (K) female

In2.82mm (K) female

Out2.82mm (K) female

Out2.82mm (K) female

13.6

Port

13.623.5

all dimensions imm

PortConnector

aMini-USBbPowerc

Functional earth (FE)SHF reserves the right to change specifications and design without notice – SHF C661 B - V001 – Nov. 11, 2022

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Mechanical Drawing with Heat Sink

b c

a

19.6
652.7

OutInDelay
InOut

SHF C661 B
AdjustableTime DelayXXXXXSHF Communication
Technologies AG

70101
111

+5 V DC

111
101120USB

Port

120Connector

PortConnector

2.82mm (K) female

aMini-USB

2.82mm (K) female

bPowerOut

2.82mm (K) femalecFunctional earth (FE)Out

2.82mm (K) female

37InInall dimensions imm

SHF reserves the right to change specifications and design without notice – SHF C661 B - V001 – Nov. 11, 2022

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