![]() The gate capacitance of the MOSFET can load the op-amp output to the point that it introduces enough phase lag to cause the circuit to go unstable. The tolerance of the current-sense resistor.A controlled (or dependent) current source is one which is determined by another measurable value in the circuit, usually a voltage (e.g. An independent current source is once which has a predetermined fixed set current. to make a sawtooth or triangular waveform).Ĭurrent sources are very common in circuit design, and as such are usually drawn using schematic symbols as shown below. Charging capacitors to provide a linear increase in voltage across it (e.g.Biasing resistors for pull-ups/pull-downs.Driving LEDs (especially high power LEDs). ![]() Current sources/sinks are used as a sub-circuit in many larger circuit designs. A current source (or sink) is not a single passive component, but a small circuit usually made from an active element ( transistor, op-amp) and a few passives (such as resistors). Worked Example: 1.0mA Constant-Current DiodeĬurrent sources and current sinks are electronic circuits which allow a fixed amount of current to flow through it, irrespective of the voltage across it.How To Calculate The Value Of The Resistor \(R_S\). ![]()
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