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SizeAt A new circuit design framework

Say the current. Get the size.

Tell SizeAt your intent, and it hands you the exact transistor that delivers it: its size, its bias voltage, and a tag with every electrical parameter. In seconds.

Try it once See how
L1L2L3L4
Cgg Total gate capacitance
fT Unity-gain frequency
CapacitancesUnity-gain frequency vs total gate capacitance
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01 Introducing SizeAt

Every designer faces one question:

Whatsizeshouldthistransistorbe?

SizeAt

Now it has an answer, and the secret is hidden in the name itself.

SizeAt is a new circuit design framework that allows designers to size every transistor at their desired current as well as other electrical parameters.

In any circuit, for any transistor, you can

AnalogMixed-signalCustom digital
Size
At the current you need.At the voltages you have.At any process corner.At any temperature.At your desired operating point.At your fingertips.

All in seconds… with SizeAt.

Every value comes from the real transistor, the same reference the whole industry trusts, at sign-off accuracy.

Tell SizeAt your intent, and it hands you the exact transistor that delivers it.

02 Why it matters

Every electronic system is built from chips.

Each with its own role: processing, power management, storage, memory and connectivity. Let's look inside one of them.

A modern chip contains many different circuit blocks.

Such as PLLs, ADCs, regulators and digital logic gates.

They all rely on their transistors.

Although these blocks serve different purposes, they all rely on the electrical parameters of their transistors to perform their functions.

Chip performance depends strongly on transistor sizing.

Because changing one transistor can affect the performance of the entire circuit, finding the right dimensions becomes a critical design problem.

03 The turning point

Start where the designer starts.

The problem is not the quality of the engineering. The skill is already there. All it needs is a workflow that is faster, easier and works the way designers think.

What if sizing worked the way designers think: starting from the currents and voltages the circuit needs?

To see the difference, think of a tap and a pipe.

The conventional waymains1.2 barL/minØ 8 mmØ 16 mmØ 12 mmtry 1tried and dropped:Ø 8 mm (0.7)Ø 16 mm (4.1)– – L/min need 2.0 L/min

Pick a pipe size, open the tap, measure the flow, swap the pipe and measure again, until you finally get the right flow.

The new waymains1.2 barL/minFlow: 2.0 L/minPressure: 1.2 barØ 12 mmlength 1.0 mspeed 0.29 m/s ✓– – L/min need 2.0 L/min

Write down the exact flow you need and the pressure you have, and receive the exact pipe, with a tag that tells you everything else about it.

Now, what if we replace the pipe with a transistor?

  1. The tapThe gate voltage
  2. The pipeThe transistor: W and L
  3. The flowThe current: ID
  4. The pressureThe voltages: VDS and VBS
  5. The pipe's tagThe transistor's tag
  • W µm
  • L µm
  • VGS mV
  • Vov mV
  • gm µS
  • rout MΩ
  • fT MHz

State them, and within seconds you receive the exact transistor: its size, its bias voltage, and a tag with every electrical parameter. Every answer is exact and ready to use. Just verify it once.

Not a better map, but a direct road from intent to size.

When this “what if” becomes real, the hours designers lose to trial and error go back to new theory, new architectures and new ideas.

Sounds too good to be true? See for yourself.

04 Everything a transistor can give you

In one shot, you clearly see everything this transistor can give you.

Bias

Know exactly where every transistor sits: its gate voltage, its threshold, its headroom.

  • Drain current
  • Gate-to-source voltage
  • Drain-to-source voltage
  • Body-to-source voltage
  • Threshold voltage
  • Overdrive voltage
  • Saturation voltage
  • Operating region
Design point 1/2Overdrive voltage vs width, for four lengths
L1L2L3L4
W Width
Vov Overdrive voltage
05 The new designer workflow

Three clear steps.

1

Define

State your intent as a design point.

  • DeviceNMOS
  • ID
  • VDS · VBS
  • L
  • Corner · temp
2

Pick

Choose the transistor whose tag meets your specification: gm, Vov, VGS or any other parameter.

  • W Vov
  • W Vov
  • W Vov ✓
  • W Vov
→ VGS
3

Verify

Simulate once to confirm it.

1 simulation · ID on target ✓Vov on target ✓

You no longer calculate or guess a size, and there's no further scripting to read charts and interpolate, because every answer comes complete.

Every sizing decision traces back to one exact transistor and its tag, which gives you a clear, defensible answer to “Why this size?”

06 The bigger picture

This is more than a faster way to size a transistor. It changes the way designers work.

Instead of making designers search again and again for the electrical behavior they need, SizeAt brings the right device characteristics straight into the sizing decision.

Start from intent

Size from the currents and voltages your circuit needs, not from a guess.

Every option at once

Hundreds of sizes in one request, each with its key electrical parameters, so you see the trade-offs before you choose.

Port or start fresh

On a new process, keep your currents and voltages and get the new sizes, or start a new design from scratch.

More time to innovate

Less trial and error, more creative design.

So, what size should this transistor be? Now you get the answer within seconds.

Try it once, on your next circuit.

Write to contact@sizeat.com

To collaborate or to learn more, write to contact@sizeat.com