What is voltage-controlled current source?

Glossary Term: voltage-controlled-current-source An amplifier that converts a voltage to a current. One synonym is OTA, or operational transconductance amplifier, a term that marries the terms transconductance amplifier and operational amplifier.

Can a current source have a voltage across it?

A current source can certainly have a voltage across it. If the voltage across a current source is zero, then it is not delivering or absorbing any power. However, if the voltage across the source is not zero, then it is either sourcing or sinking power into the rest of the circuit.

Is Mosfet a voltage-controlled current source?

A MOSFET, therefore, in conjunction with a power supply, can act as a voltage controlled current source in which the drain current is controlled by the gate voltage.

Is op amp a Vcvs?

The ideal op-amp works like a Voltage Controlled Voltage Source (VCVS), where its output is equal to the difference of its inputs multiplied by a large open-loop gain A_OL . Modeling the op-amp as a VCVS is a very powerful technique that makes it possible to design and analyze complicated op-amp circuits.

What is the voltage across a voltage source?

The voltage across an ideal voltage source is independent of the current flowing through it. An ideal voltage source can be defined by an equation like this: v = V v = \text V v=Vv, equals, start text, V, end text, for example: v = 1.5 V v = 1.5\,\text V v=1.

Which part of the MOSFET is controlling the current?

Mosfet act as a constant current source in the saturation region. This is because, after the Vds is increased to such a level that pinch-off of the channel occurs, the gate and the drain voltages looses the control over the current flowing.

What is an ideal opamp?

Operational amplifier: The ideal op amp is an amplifier with infinite input impedance, infinite open-loop gain, zero output impedance, infinite bandwidth, and zero noise. It has positive and negative inputs which allow circuits that use feedback to achieve a wide range of functions.

What is a bi-directional current source for a grounded load?

A bi-directional current source for a grounded load will always have some complication in its construction. The improved Howland Current Pump as shown in Figure 1 is the most frequent choice for this function. The Howland requires carefully matched resistors or resistor networks.

How is the output voltage of a bipolar power supply controlled?

The output voltage is controlled by the voltage source CONTROL signal at the CTRL pin of controller U1. Figure 1. Electrical schematic of bipolar, bidirectional, 2-terminal power supply: V IN = 5 V to 24 V, V OUT = ±10 V at 3 A. The low-pass filter C F, R F alleviates sharp changes in control voltage.

How does the output current depend on the load resistance?

Since the load is in series with the resistor R, the output current is always proportional to the input voltage, regardless of the load resistance (within limits, of course—e.g., you won’t be able to drive 10 mA through a 1 MΩ load unless you can find amplifiers that accept supply voltages up to 10,000 V or so).

What is a simple current source circuit?

Figure 2 This simple current source (Simple Source) circuit provides accuracy with a single resistor by floating the power supplies of the output stage. Isolated dual output DC to DC converters are readily available at many power levels as a check of your favorite distributors website will show.