Opamp Output Current Limit Calculator

Screen requested opamp resistive-load voltages under explicit asymmetric source/sink current limits; ideal hard-current clamp, excludes rail swing, thermal behavior, reactive loads or device safety.

Description

An asymmetric opamp current clamp uses separate source and sink limits.

An asymmetric opamp current clamp uses separate source and sink limits. A resistive load converts requested voltage into current.^[1]

Enter finite requested voltages, positive load resistance and nonnegative current limits. Return requested currents, clamped outputs and strict source/sink exceedance indexes; empty requests are allowed.

When to use Opamp Output Current Limit Calculator

Use Opamp Output Current Limit Calculator when you need to evaluate the supplied records under the calculation and evidence rules below. No rail swing, thermal behavior, reactive load or device safety is modeled.

Prepare measured device or circuit evidence with matched frequency, temperature, waveform and calibration conditions. Supply explicit caller ratings and limits.

How to use Opamp Output Current Limit Calculator and understand its results

Prepare measured device or circuit evidence with matched frequency, temperature, waveform and calibration conditions. Supply explicit caller ratings and limits.
Enter requestedOutputVoltagesV, loadResistanceOhms, callerSourceCurrentLimitA, callerSinkCurrentLimitA using the field table and calculation rules, then run the tool.
Read requestedLoadCurrentsA, currentLimitedOutputVoltagesV, sourceLimitExceededIndices, sinkLimitExceededIndices. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
requestedOutputVoltagesV	Requested output voltages v	list of number	Required
loadResistanceOhms	Load resistance ohms	number	Required
callerSourceCurrentLimitA	Caller source current limit a	number	Required
callerSinkCurrentLimitA	Caller sink current limit a	number	Required

requestedI=V/R; modeledV=clamp(I,−sinkLimit,sourceLimit)×R

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
requestedLoadCurrentsA	Requested load currents a	list of number
currentLimitedOutputVoltagesV	Current limited output voltages v	list of number
sourceLimitExceededIndices	Source limit exceeded indices	list of number
sinkLimitExceededIndices	Sink limit exceeded indices	list of number

json

{
  "input": {
    "requestedOutputVoltagesV": [
      2,
      -2
    ],
    "loadResistanceOhms": 100,
    "callerSourceCurrentLimitA": 0.01,
    "callerSinkCurrentLimitA": 0.03
  },
  "output": {
    "requestedLoadCurrentsA": [
      0.02,
      -0.02
    ],
    "currentLimitedOutputVoltagesV": [
      1,
      -2
    ],
    "sourceLimitExceededIndices": [
      0
    ],
    "sinkLimitExceededIndices": []
  }
}

Limitations and assumptions

No rail swing, thermal behavior, reactive load or device safety is modeled.

Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Numeric lists are limited to 10,000 entries; string lists to 128 strings of at most 128 characters each. The rules above may impose smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Ffe Tap Weight Calculator: A finite causal zero-forcing FFE inverts the leading channel response. Truncation leaves a residual tail. For a complementary task, use Ctle Peaking Calculator: A normalized single-zero/two-pole CTLE transfer expresses frequency gain relative to DC. Pole and zero choices are caller parameters.

References

Opamp Output Current Limit Calculator — tool.io

Similar or alternative tools

Ffe Tap Weight Calculator
A finite causal zero-forcing FFE inverts the leading channel response. Truncation leaves a residual tail.
Ctle Peaking Calculator
A normalized single-zero/two-pole CTLE transfer expresses frequency gain relative to DC. Pole and zero choices are caller parameters.