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: http://www.shf-communication.com

Datasheet
SHF 641 A
56 GHz T Flip-Flop (TFF)
1:2 Frequency Divider

SHF reserves the right to change specifications and design without notice – SHF 641 A - V003 – August 31, 2018

Page 1/9

Description
The SHF 641 A is a T Flip-Flop (TFF) module capable of broadband operation up to 56 GHz using asinusoidal input signal. A frequency of half the input frequency is provided at the outputs. It offers highsensitivity and high quality output signals together with a compact size and ease of operation.

Features

Broadband operation up to 56 GHz
Two differential output ports with 90° phase shift between the outputs
800 mVpp single ended output swing
Single ended or differential operation (either In or In! or both can be used)
Output Level Control
Bias BoardApplications


100G Ethernet development and prototyping
OC-768 / STM-256 applications
Telecom transmissionFibre ChannelBroadband test and measurement equipment®

Block Diagram®

Fibre Channel is a registered trademark of the Fibre Channel Industry Association

SHF reserves the right to change specifications and design without notice – SHF 641 A - V003 – August 31, 2018

Page 2/9

Bias Board
At delivery, the bias board is mounted on a common base plate, together with the SHF 641 A TFF. Whenusing the bias board only one supply voltage of -5V needs to be applied; the output level control voltage“LVL” will be provided by the bias board.
In factory setting the bias voltage is set to maximum output voltage. However, if wanted the customer canadjust the output level “LVL” with the appropriate trim potentiometer on the bias board.
For system applications it is easily possible to remove the bias board. In that case the operating voltages
have to be supplied by the customer’s circuitry.
Output Level Control “LVL”

Not Used-5V

SHF reserves the right to change specifications and design without notice – SHF 641 A - V003 – August 31, 2018

Page 3/9

Specifications
Parameter

Unit

SymbolMin.

GHzfin,minGHz

fin,max56mVVin500mV

Vout

600

Supply Voltage

VVee-5.2

Supply Current

mATyp.

Max.

Comment12@ 500mV input
amplitude, see page 8

Input Parameters
Minimum Input Frequency

1Maximum Input Frequency
Input Voltage

60@ 500mV input
amplitude, see page 81000

2Single ended,peak-to-peak,
see page 8

800

1000

Single ended,peak-to-peak,
see page 8-5-4.8

Iee

300

330mW

Pd

1500

V

LVL

-3.3

0°C

Tambient

1535

Output Parameters
Output Voltage

Power Requirements

Power Dissipation@ VEE = -5V;
incl. Bias Board

Bias Voltages
Output Level Adjust

if not used, connect togndConditions
Operating Temperature

1

Theoretical limit is DC, practical limit depends on slew rate of input signal

2corresponds to a maximum sinusoidal input signal of +4dBm

SHF reserves the right to change specifications and design without notice – SHF 641 A - V003 – August 31, 2018

Page 4/9

Typical Output Waveforms
The measurements below had been performed using an Agilent 86100D DCA with Precision Time Base
Module (86107A) and 70 GHz Sampling Head (86118A). The output of the TFF had been connected directly
to the DCA input.

Output signal @ fout = 30 GHz

Output signal @ fout = 28 GHz

Output signal @ fout = 25 GHz

Output signal @ fout = 21,5 GHz

Output signal @ fout = 16 GHz

Output signal @ fout = 14 GHz

SHF reserves the right to change specifications and design without notice – SHF 641 A - V003 – August 31, 2018

Page 5/9

Output signal @ fout = 125 GHz

Output signal @ fout = 8 GHz

Output signal @ fout = 0.5 GHz

SHF reserves the right to change specifications and design without notice – SHF 641 A - V003 – August 31, 2018

Page 6/9

Output Signal Timing
The measurements had been performed using an Agilent 86100B DCA with Precision Time Base Module(86107A) and 70 GHz Sampling Head (86118A). The output of the TFF had been connected directly to theDCA input. The screenshots shown below describe the phase relation between the 2 differential output
signals with its 90° phase shift between output port 1 and output port 2.

Out1 @ fout = 5 GHz

Out1 inverted @ fout = 5 GHz

Out2 @ fout = 5 GHz

Out2 inverted @ fout = 5 GHz

SHF reserves the right to change specifications and design without notice – SHF 641 A - V003 – August 31, 2018

Page 7/9

Typical Results

SHF reserves the right to change specifications and design without notice – SHF 641 A - V003 – August 31, 2018

Page 8/9

Outline Drawing

9,1

23459,1

1

GND
3,8
5,08
4 x 5,08

1912,34x Ø2,7InInOut 2

Out 1

29TFF

Out 135Out 2293835

SHF 641 A

1919XXXXXSHF AG Berlin-5V33LVL

28344052,55,089,7PortConnector

In1.85mm (V) female

In1.85mm (V) female

Out 11.85mm (V) female

Out 1

1.85mm (V) female

Out 2

1.85mm (V) female

PinDesignation

Out 2

1.85mm (V) female

1Level (LVL)

2nc

3nc

4nc

5-5V

12,3

19,512,3

SHF reserves the right to change specifications and design without notice – SHF 641 A - V003 – August 31, 2018

Page 9/9