Use this semiconductor calculation for first-order device, material, fabrication, interconnect, packaging, or reliability estimates when every coefficient and unit convention is known.

Intrinsic output resistance (ohm)

Required number in ohm. Device intrinsic output resistance.

Transconductance (S)

Required number in S. Small-signal transconductance of the cascode device.

The cited overview of Semiconductor device supplies background for the terminology and domain context used by this tool.^[1]

Estimate the output resistance of two matched cascoded devices as 2ro + gm·ro². Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Cascode output resistance (ohm)

Returned number in ohm. Approximate cascode output resistance.

• Material composition, geometry, process history, temperature, electric field, bias, interfaces, parasitics, and fitted parameter ranges can invalidate a compact semiconductor model.
• Intrinsic output resistance must be at least 5e-324.
• Transconductance must be at least 5e-324.
• Use finite inputs in the displayed units, preserve source measurements and assumptions, and independently verify consequential decisions.

Compare the estimate with measured process data, current device documentation, and a higher-fidelity circuit, field, thermal, quantum, or TCAD model when the decision requires it.

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