CALCULATORS / ANALOG CIRCUITS AND FILTERS

Op-amp bandwidth and slew-rate screening calculator

Single-pole gain-bandwidth approximation.

analog-op-amp-bandwidth.napkin / editable

SCENARIO COMPARISON

Compare the numbers.

This source describes an analytical model. Its quantities and checks are the view.

Scenario	bandwidthHz	margin
	100000	10
	80000	8

All calculated quantities are listed with the inputs. Switch to Source to inspect the equations.

SCENARIOS / CALCULATED VALUESSAME SOURCE

Change an input to see the consequences.

bandwidth margin target10.00 ✓ passes

BASELINE INPUTS

gainBandwidth1000000 HzclosedGain10 signalFrequency10000 Hz

CALCULATED

bandwidth100000 Hz

margin10

Edits change the baseline source.

THE SOURCE

Edits below update the same model.

# Op-amp bandwidth and slew-rate screening
# Scope: Single-pole gain-bandwidth approximation.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

gainBandwidth = 1000000 Hz
closedGain = 10
signalFrequency = 10000 Hz

bandwidth := gainBandwidth/closedGain [Hz]
margin := bandwidth/signalFrequency

check bandwidth margin target: margin >= 5

scenario alternative: gainBandwidth = 800000 Hz

Calculated from your source · not saved

Baseline · Baseline

bandwidth margin target10.00 ✓ passes

alternative · alternative

bandwidth margin target8.00 ✓ passes

Illustrative first-order example. Checks are editable requirements, not design standards. The broader topic may require additional equations, data, and validation.

Formula and units

This example uses the following equations. Input names and units match the editable source above.

bandwidth: bandwidth = gainBandwidth/closedGain [Hz]
margin: margin = bandwidth/signalFrequency

Original worked example

These are the baseline values in the downloadable source. Edits above let you test your own values.

Given

gain bandwidth: 1000000 Hz
closed gain: 10
signal frequency: 10000 Hz

Calculated

bandwidth: 100000 Hz
margin: 10

Assumptions and limits

Single-pole gain-bandwidth approximation.

The requirement checks use the limits written in this example. Passing a check does not establish that the model covers every load, material behavior, or operating condition in a real design.

Download this .napkin example ↓

Take it further with your agent

Napkin keeps the inputs, equations, checks and assumptions together in one study. Your agent sets it up; you change the numbers.

Try with Claude ↗

codex 'Use Napkin (https://napkin.engineering/mcp, or the local Napkin plugin) to build a study: Op-amp bandwidth and slew-rate screening. Inputs: gain; signal amplitude/frequency; GBW; slew rate. Outputs: bandwidth and slew requirements. Model scope: Lumped small-signal models within device operating ranges. Read napkin_capabilities and the current snapshot. Ask me for the values that matter, label assumptions with units, author .napkin source, validate it and apply it with napkin_source using the current revision, then open the study. Add checks for the limits I supply. Keep unsupported analyses explicit.'

Claude needs the Napkin connector; Codex needs the Napkin plugin. Set up your agent ↗

The broader study

The topic brief below describes the broader scope. The worked example above states the particular calculation it implements.

Inputs: gain, signal amplitude/frequency, GBW, slew rate
Outputs: bandwidth and slew requirements
Modes: calculate, compare, sweep
Drawing: Schematic and Bode plot

EXECUTABLE WORKED EXAMPLE · FIRST-ORDER MODEL · CHECK THE SCOPE & ASSUMPTIONS