Active Digital & Analog Modules

SHF provides a wide range of high performance digital high speed modules suitable for the use in telecommunication systems and test and measurement setups e.g. for SONET OC-768 / SDHSTM-256, 100 GbE, 400 GbE or Fibre Channel.

Raising the speed (up to 120 Gbps serial)

Our multiplexers (MUX) and demultiplexers (DEMUX) offer broadband operation up to 120 Gbps with adjustable output amplitude and eye symmetry.

Raising the number of levels (digital-to-analog converters up to 60 GBaud)

Our digital-to-analog converters (DAC) operate at baud rates up to 32 or 60 GBaud. Up to six single-ended serial data streams are converted into one differential multi-level signal. This makes the SHF DAC an ideal electrical signal source e.g. for PAM or QAM applications. Together with one of our our programmable BPGs (Bit Pattern Generators) a high speed “remote head” AWG (Arbitrary Waveform Generator) is formed.

Raising the speed and the number of levels (PAM4 Multiplexer up to 112 GBaud)

Our PAM4 multiplexer take four binay input data streams, re-time, reshape the signals and multiplex each two to a binary signal of double the speed. Inside the module a two bit DAC converts these two extremely high speed signals to a four level signal.


The limiting amplifier and the D-type flip-flop (DFF) are ideally suited to clean, re-shape and re-time signals to perfect binary waveforms.

Tailor it to the needs

The needs of our customers are different; therefore SHF is happy to offer customization to specific applications. A small selection of such assemblies based on our standard product offerings can be found in the customized assemblies subsection.

Multiplexer (Mux) & Demultiplexer (Demux)

P/NTypeInput Data
Rate Range
Output Data
Rate Range
Max. Output
Amplitude (typ.)
SHF 601 A2:1 Mux1… 30 Gbps2… 60 Gbps0.63 V single-ended
1.26 V differential
SHF 602 B4:1 Mux1.5… 15 Gbps6… 60 Gbps0.55 V single-ended
1.1 V differential
SHF 603 A2:1 Mux2… 60 Gbps4… 120 Gbps0.4 V single-ended
0.8 V differential
SHF 604 A2:1 Power Mux2… 40 Gbps4… 80 Gbps1.4 V single-ended
2.8 V differential
SHF 621 A1:2 Demux2… 60 Gbps1… 30 Gbps0.38 V single-ended
0.76 V differential
SHF 623 B1:2 Demux10… 120 Gbps5… 60 Gbps0.4 V single-ended
0.8 V differentia

Digital-to-Analog Converter (DAC)

P/NTypeInputOutputOutput Amplitude
(typ., FS*)
SHF 611 F3-Bit DAC1… 32 Gbps
at 2 or 3 inputs
1… 32 GBaud
4 or 8 levels
0.65 V single-ended
1.3 V differential
SHF 612 A4-Bit DAC1… 32 Gbps
at 2, 3 or 4 inputs
1… 32 GBaud
4, 8 or 16 levels
0.65 V single-ended
1.3 V differential
SHF 613 A3-Bit DAC1… 60 Gbps
at 2 or 3 inputs
1… 60 GBaud
4 or 8 levels
0.65 V single-ended
1.3 V differential
SHF 614 B6-Bit DAC1… 60 Gbps
at 2 to 6 inputs
1… 60 GBaud
4 to 64 levels
1.3 V single-ended
2.6 V differential
SHF 615 B3-Bit Power DAC1… 60 Gbps
at 2 or 3 inputs
1… 60 GBaud
4 or 8 levels
2.4 V single-ended
4.8 V differential

* FS: Full Scale i.e. maximum output with all input channels active. Output voltage can be reduced by software or by applying less input channels.

PAM4 Multiplexer

SHF 616 APAM4 Multiplexer1… 56 Gbps binary
(at 4 inputs)
2… 112 GBaud PAM4
(4… 224 Gbps PAM4)

Re-timing / Re-shaping (DFF & Limiting Amplifier)

P/NTypeData Rate RangeDatasheet
SHF 631 AD-type Flip-Flop2… 56 Gbps
SHF 651 ABuffer Amplifier1… 56 Gbps

Frequency Divider & Multiplier

P/NTypeInput Operating RangeOutput Operating RangeDatasheet
SHF 442 Af -> f/2 Static Frequency Divider0.5… 25 GHz0.25… 12.5 GHz
SHF 641 Af -> f/2 Static Frequency Divider2… 56 GHz1… 28 GHz
SHF 1020 CFrequency Doubler9… 12.5 GHz18… 25 GHz
SHF 1428 AFrequency Doubler12… 16.5 GHz24… 33 GHz
SHF 1632 AFrequency Doubler13.5… 18 GHz27… 36 GHz
SHF 2040 AFrequency Doubler19.5… 21.75 GHz39… 43.5 GHz
SHF 2856 AFrequency Doubler25… 32 GHz50… 64 GHz