XYNC

by Fairwaves

The ultimate low-cost massive MIMO SDR, with up to 32x32 transmit/receive channels

View all updates Oct 29, 2019

Power Consumption, Power Supply, and Cooling

by Alexander Chemeris

First of all, I want to say how happy we are to have received our first orders for XYNC as a part of this campaign. All of our XYNC customers so far have been companies and R&D labs with long procurement cycles, and it is thrilling to see some of them coming through on short notice.

In the meantime, backers have raised important questions about the power consumption, power supply, and cooling of XYNC, so we decided to address them in this update.

Power Consumption

XYNC consists of three main units:

  1. The PCIe switch unit
  2. The synchronization & frontend unit (classical or 6 GHz RX)
  3. Several XTRX SDR units (4x for Quadro or 8x for Octo)

The power consumption of the PCIe switch and frontend units is relatively constant at about 10 W for the classical version.

XTRX power consumption varies significantly depending on whether you're doing RX, TX, or both; on whether you're doing continuous or burst TX/RX; and on output power, internal gains, bandwidth, digital pre-processing, and a few other parameters. Maximum XTRX power consumption at maximum sample rate and gains is approximately 3 W, which is what we have used for the calculations below:

Included XTRXsMaximum Power Consumption
XYNC Quadro422 W
XYNC Quadro 6 GHz RX4TBD *
XYNC Octo834 W
XYNC Quadro Tandem834 W
XYNC Quadro Tandem 6 GHz RX8TBD *
XYNC Octo Tandem1658 W

* We have not yet measured the power consumption of the 6 GHz RX frontend. When we do, we will post an update with its power consumption values.

Power Supply

XYNC is powered from two different sources, a PCIe edge connector and a 6-pin 12 V GPU ATX Molex connector:

PCIe Switch Unit:PCIe edge connector
Synchronization & Frontend Unit:6-pin 12 V GPU ATX Molex connector
XTRX Units:PCIe edge connector

6-pin 12 V GPU ATX Molex connectors, which are typically used to provide power to video cards, look like the following:

In terms of voltages, XYNC uses 3.3 V and 12 V from the PCIe connector and 12 V from the 6-pin ATX connector for the synchronization logic on the synchronization & frontend unit.

Cooling

With tens of watts of power consumption, cooling is important. Output power and other parameters of the LMS7002M chips we're using begin to degrade at about 80°C. It's important to keep the ambient temperature significantly below that to provide enough of a temperature gradient for the chips to cool. If you're interested in phase stability, it's also important to keep the temperature as stable as possible – temperature changes can noticeably affect phase stability, causing phase differences between the XYNC channels to drift.

For general applications, we recommend at least providing a stable flow of air through the PCIe compartment. For industrial applications, an external box with a passive heatsink might be a good choice. You can connect such a box to the PCIe bus with a PCIe bus extender.

Fairwaves is happy to work with backers on heat dissipation designs that will keep your XYNC operating safely under its target conditions.

About the Author

Alexander Chemeris


$19,500 raised

of $58,000 goal

34% Funded

Pledge Now

$4,500

XYNC Quadro

Four XTRXs provide eight TX channels at 30 MHz - 3.7 GHz and eight RX channels at 30 MHz - 3.7 GHz. (Price will increase after the campaign ends.)


$5,800

XYNC Quadro 6 GHz RX

Four XTRXs provide eight TX channels at 30 MHz - 3.7 GHz and eight RX channels at 1.8 GHz - 6 GHz. (Price will increase after the campaign ends.)


$6,500

XYNC Octo

Eight XTRXs provide 16 TX channels at 30 MHz - 3.7 GHz and 16 RX channels at 30 MHz - 3.7 GHz. (Price will increase after the campaign ends.)


$9,000

XYNC Quadro Tandem

Eight XTRXs provide 16 high-throughput TX channels at 30 MHz - 3.7 GHz and 16 high-throughput RX channels at 30 MHz - 3.7 GHz. (Price will increase after the campaign ends.)


$11,600

XYNC Quadro Tandem 6 GHz RX

Eight XTRXs provide 16 high-throughput TX channels at 30 MHz - 3.7 GHz and 16 high-throughput RX channels at 1.8 GHz - 6 GHz. (Price will increase after the campaign ends.)


$13,000

XYNC Octo Tandem

16 XTRXs provide 32 high-throughput TX channels at 30 MHz - 3.7 GHz and 32 high-throughput RX channels at 30 MHz - 3.7 GHz. (Price will increase after the campaign ends.)

Credits

Fairwaves

We are a vertically integrated vendor of cellular equipment focused on the needs of emerging markets. We are developing, manufacturing, deploying, and operating turn-key cellular network solutions including radio equipment, towers, power and backhaul all the way to a core network and SS7 interconnect. Our team has been building software-defined radios and systems based on them since 2009 and is well known for its ClockTamer, UmTRX, and UmSITE products.


Alexander Chemeris

CTO

Sergey Kostanbaev

Software & Firmware Development

Andrey Sviyazov

Hardware Design

Albert Gardiner

CEO

Andrey Bakhmat

Marketing

Andy Avtushenko

Manufacturing

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