RX-Model

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Rhonexum introduces the RX-Model — a SPICE-compatible compact model built specifically for cryogenic circuit simulation.

While traditional models struggle at ultra-low temperatures, relying on bloated room-temperature frameworks with hundreds of parameters, the RX-Model sets a new standard: fast, stable, and cryo-native.

● A tiny chip like this can have massive costs and delay. in ourdays, a fabrication cycle can take up to $25k per mm2 in 8 months.

Conventional circuit design processes rely on multiple physical iterations before reaching a functional prototype.

Each design adjustment requires new manufacturing runs and testing cycles, extending timelines and significantly increasing costs. Without accurate simulation, teams work in the dark — refining through trial and error rather than predictive insight. This iterative loop delays innovation and reduces efficiency across the entire development pipeline.

of the designs fail on the first try.
That’s where we start.

fewer chips.
less cash.
faster results.

Existing Solutions

10 manufacturing runs

1 manufacturing run

80 months

8 months

$2M

$200K

90% Time & Cost reduction

Existing Solutions

10 manufacturing runs

80 months

$2M

1 manufacturing run

8 months

$200K

90% Time & Cost reduction

Engineered with a physics-based, semi-empirical approach and advanced normalization techniques, RX-Model delivers robust, numerically stable simulations across cryogenic regimes. It’s technology-agnostic, working seamlessly with various CMOS processes.

Unlike conventional tools, RX-Model captures key cryogenic effects — like quantum transport — without convergence issues. It uses significantly fewer parameters, is deployable in days, and plugs effortlessly into both commercial and open-source platforms.

simulation display example

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