How to characterize a voltage controlled current source?

To understand how to characterize a voltage controlled current source (VCCS)? We must know about VCCS. Voltage-controlled current source (VCCS) is an electronic device that produces a current that is proportional to an input voltage signal. To characterize a VCCS, you need to determine its transfer function, which relates the output current to the input voltage.

In this article, we’ll take you through the steps to characterizing a VCCS, including measuring input and output ranges, determining the transfer function, evaluating linearity, measuring input and output impedance, and assessing power consumption.

At the end of this guide article you’ll have a solid knowledge of how to select and design circuits using voltage controlled current source devices (VCCS), which will make those electronic projects more productive and efficient.

How to characterize a voltage controlled current source (VCCS), you can follow these steps:

  1. Measure the input voltage range: Find out the input voltage range that the VCCS will accept. This can be accomplished by applying various amounts of voltages to an input on the VCCS and observing the current at the output.
  2. Measure the output current range: Find the possible range of output currents the VCCS is able to produce. This is done by applying various output voltages on the VCCS and then measuring the output currents.
  3. Determine the transfer function: Determine the function for transfer of VCCS through dividing the output’s current with the input voltage every measurement. This will reveal an equation with the input voltage as well as output current.
  4. Evaluate linearity: Check the degree to which the transfer function is an unidirectional line. A linear VCCS performs more similar to an ideal VCCS.
  5. Measure input impedance: Determine the amount of resistance the VCCS gives to the voltage signal that it is connected to. This is done by applying a voltage known at the source of the VCCS and observing the resultant current.
  6. Measure output impedance: Measure the resistance that the VCCS presents to the output current. This can be done by applying a known current to the output of the VCCS and measuring the resulting voltage.
  7. Evaluate power consumption: Find out the power the VCCS consumes when it is operating. This can be done by measuring the voltage and current at the input of the VCCS and calculating the power consumed.


The process of determining the properties of a VCCS is the determination of the range of its input voltage and output current range linearity, transfer function, the output impedance and input, and the power consumption. These data is used determine the right VCCS for the specific application as well as to design circuits to contain VCCS devices.