Data Sheet SHF C683 A
SHF Communication Technologies AG

Data SheetSHF C683 AAnalog FIR Filter

SHF reserves the right to change specifications and design without notice
V002 - Mar. 21, 2023 - Page 1

Data Sheet SHF C683 A
SHF Communication Technologies AG

Description
The SHF C683 A is a tunable analog 6-tap finite impulse response (FIR) filter. The differential input signal isamplified and filtered by a 6-stage FIR filter structure with fixed tap delays of about 8 ps. The frequency
response can be arbitrarily modified by adjusting the filter coefficients (i.e. the gain of the tap amplifiers inthe GUI). Equalizing operation has been verified for heavily degraded signals up to 70 GBaud PAM4 and NRZ(please be referred to the signals below). All RF in- and output ports are AC-coupled and internallyterminated with 50 Ohm to GND. Unused in- or output ports should be terminated with 50 Ohm.

FeaturesDifferential data input and output

Compact module to be placed wherever adaptive equalization is required e.g. close to the DUTComplementary DSP software (“SHF Optimizer”) to calculate optimum settings from s2p-files andcaptured traces from oscilloscopes

Applications


Quality improvement of a degraded signal e.g. for BER measurements



Equalization of transmission channels

Emulation of various RF and microwave modules

Signal predistortion to simulate various transmission channels



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
V002 - Mar. 21, 2023 - Page 2

Data Sheet SHF C683 A
SHF Communication Technologies AG

Block Diagram
SHFC683 A
τ

Inτ

In∑

τ

τ

∑∑τ

∑

OutOut∑FIR Filter

USB+5VSpecifications
Absolute Maximum Ratings
Parameter

Unit

SymbolMax

CommentmVVdata in900

Peak-to-PeakSingle-ended

External DC Voltage on
RF Input Ports

VVDCin-6+6AC coupled input

External DC Voltage on
RF Output Ports

VVDCout-6+6AC coupled output

DC Supply Voltage

VVcc

0+6Parameter

UnitSymbol

Min

Maximum Analog
BandwidthGHz

f-3dB55

Data Input Voltage

mVVdata in

1 dB Compression

mVV1dB

Data Input Voltage

MinTypInput Parameters

1TypMax

Comment

500

Eye Amplitude
Single-ended

1350
175

Eye Amplitude
Single ended drive
Differential drive (each input port)

Analog Bandwidth depends on the set filter characteristic

SHF reserves the right to change specifications and design without notice
V002 - Mar. 21, 2023 - Page 3

Data Sheet SHF C683 A
SHF Communication Technologies AGOutput Parameters
Parameter

Output Amplitude

Unit

SymbolMin

TypMaxComment700

Eye Amplitude
Single-ended
Depending on tap settings andinput amplitude

Max

Comment+5.2

2.5 x 0.7 mm DC Power JackmV

Vout

Parameter

Unit

SymbolMin

Supply Voltage

V

VCC+4.8

Supply Current

mA

ICC

Power Dissipation

W

Pd

Parameter

Unit

SymbolInput Connectors

Ω50

1.85 mm (V) female

Output Connectors

Ω50

1.85 mm (V) female

DimensionsmmPower Requirements
Typ1050

1100
5.75@ VCC = +5VMax

CommentMechanical Characteristics

WeightMin

TypSee pages 8-9g90moduleg420

module + heat sink

Conditions
Parameter

UnitSymbol

Min

Operating Temperature°C

Tambient

15TypMax

Comment35

SHF reserves the right to change specifications and design without notice
V002 - Mar. 21, 2023 - Page 4

Data Sheet SHF C683 A
SHF Communication Technologies AG

Remote Interface & Software
The filter is controlled either by the SHF Control Center (SCC) software or by the dedicated DSP program
SHF-Optimizer. The SCC is an easy to use tool for setting the filter coefficient. The SHF-Optimizer can do thesame, but is much more powerful as it provides various algorithms to calculate the optimum settings (e.g.
based on signal traces from supported oscilloscopes or s-parameters). In addition, the SHF Optimizer
provides accurate prediction of the output eye, frequency response and group delay at any stage of thesignal chain. Both software packages are a complementary part of the SHF C683 A.

GUI – SHF Control Center SCC

GUI – SHF-Optimizer

SHF reserves the right to change specifications and design without notice
V002 - Mar. 21, 2023 - Page 5

Data Sheet SHF C683 A
SHF Communication Technologies AGTypical FIR Filter PresetsFlat frequency responses for maximum bandwidth at various gain levels

Frequency responses for a 3, 6, 9 and 12 dB slope @ 35 GHz

SHF reserves the right to change specifications and design without notice
V002 - Mar. 21, 2023 - Page 6

Data Sheet SHF C683 A
SHF Communication Technologies AG

Example Application
Compensation of a 3m SMA cable

NRZ @ 70 Gbps without equalization

NRZ @ 70 Gbps with equalization

PAM4 @ 70 GBaud without equalization

PAM4 @ 70 GBaud with equalization

SHF reserves the right to change specifications and design without notice
V002 - Mar. 21, 2023 - Page 7

Data Sheet SHF C683 A
SHF Communication Technologies AG

Mechanical Drawing

a b c d4xØ4028

13.6

2.7

13.6

OutIn

SHF C683 AInOut51453551376

SHF CommunicationTechnologies AG3USB

23.5354554

AnalogFIR Filter+5 V DC

3452.7PortConnector

In

1.85mm (V) female

aMini-USBIn

1.85mm (V) femalebPower-LED

Out

1.85mm (V) femalecPowerOut1.85mm (V) femaledFunctional earth (FE)13.6Connector
13.6PortAll dimensions are in mm

SHF reserves the right to change specifications and design without notice
V002 - Mar. 21, 2023 - Page 8

Data Sheet SHF C683 A
SHF Communication Technologies AGMechanical Drawing with Heat Sink

a b c d19.6
652.7

19.6

OutIn

SHF C683 AAnalog
FIR FilterInOut51376

SHF Communication
Technologies AG70

101
111

+5 V DC

111
101120

USB

120

Port

In

1.85mm (V) female

aMini-USBIn

1.85mm (V) femalebPower-LED

Out

1.85mm (V) female

c

Power

Out

1.85mm (V) femaledFunctional earth (FE)37

Connector

PortAll dimensions are in mmConnector

SHF reserves the right to change specifications and design without notice
V002 - Mar. 21, 2023 - Page 9Data Sheet SHF C683 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
V002 - Mar. 21, 2023 - Page 10