SHF is going to release a new stand-alone analog (clockless) FIR equalization module for speeds up to 70 GBaud PAM4. The SHF C683 A can significantly improve the quality of heavily degraded signals. It literally opens up your eyes.
The following pictures show 64 GBaud (128 Gbps) PAM4 signals measured with a high-speed sampling scope in its original state (e.g. degraded by a DUT) and improved by equalization through the SHF C683 A.
![64 GBaud Input and Output of SHF C683 A 64 GBaud Input and Output of SHF C683 A](https://www.shf-communication.com/wp-content/uploads/shf_c683_a_64g_in_and_out.png)
Measured 64 GBaud (128 Gbps) input and output signal of a SHF C683 A
Comparing these measured eye diagrams with the signals calculated by the complementary software “SHF-Optimizer” shows how accurate the software predicts the reality. The calculated signals at different stages in the signal chain are shown below.
The SHF-Optimizer bases its calculation either on ideal inputs, imported signal traces or measurements directly acquired from supported sampling oscilloscopes. Additionally, these signals can be distorted or modified (e.g. by loading s-parameter files). The result is used by the software for a fast and quick calculation of the output eye, the frequency response and the group delay of the signal chain without optimization.
![SHF Optimizer - responses and signals of the calculated distorted signal SHF Optimizer - responses and signals of the calculated distorted signal](https://www.shf-communication.com/wp-content/uploads/SHF-Optimizer-responses-and-signals-of-the-calculated-distorted-signal.png)
Responses and signals of the calculated distorted signal
(without SHF C683 A Filter)
![SHF Optimizer - responses and signals of the calculated optimized signal](https://www.shf-communication.com/wp-content/uploads/SHF-Optimizer-responses-and-signals-of-the-calculated-optimized-signal.png)
Responses and signals of the calculated optimized signal
(with SHF C683 A Filter)
Another unique feature of the SHF C683 A is its ability to emulate various RF and microwave modules. If a DUT is not physically available, the SHF C683 A can mimic that DUT based on loaded s-parameters or for ideal components like cables, PCB traces, Bessel filters, attenuators or amplifiers within certain ranges.
Key Features – SHF C683 A
- Bandwidth > 55 GHz (suitable for PAM4 signals from 20 to 70 GBaud)
- 6 taps
- Compensates insertion losses of up to 12 dB
- Input signals up to 350 mV single-ended or differential
- Differential input and output ports can also be used single-ended (even mixed configurations)
- Compact module is flexible enough to be placed wherever adaptive equalization is required
The full data sheet is available in our “RF & Microwave Modules and Instruments” product section.