Voltage Controlled Voltage Source Amplifier

How to design a simple voltage controlled bidirectional current source.

Voltage controlled voltage source amplifier. Early transistors were made from germanium but most modern bjts are made from silicon. The mode selection is made via a jumper setting located on the amplifier main board. In any amplifier the output voltage is depends upon their input voltage then it is called voltage controlled voltage source. Figure 39 1 s conceptual design utilizes a differential amplifier featuring differential uncommitted feedback inputs.

Voltage controlled voltage source vcvs and voltage controlled current source vccs comparison. This effect can be used to amplify the input voltage or current. A voltage controlled current source with ground referred input and output is difficult to achieve. As shown in the schematic below this current source requires two amplifier ics and a few passives.

However this control voltage can be given from a variable voltage divider using any kind of potentiometer. In the theory of electrical networks a dependent source is a voltage source or a current source whose value depends on a voltage or current elsewhere in the network. Diagram taken from the datasheet for the lt1102. The currents should be in a range from 0 to 2 5ma.

Voltage dependent generated current can be expressed as i vsine r8. Most op amps are limited to around 30v on the supply so the circuit wont work for higher output voltages. Voltage controlled voltage source schematic the disadvantage of the circuit above is that the supply of the op amp is tied to the hv supply. Where r8 1kohm.

Ae techron 7000 series amplifiers can be field configured to operate as voltage amplifiers voltage controlled voltage source or as transconductance amplifiers voltage controlled current source. Executions exist but are often cumbersome involving numerous components. The output voltage in an amplifier is k times input voltage. K gain of the amplifier let us consider a one example s.

Load resistance should be up to 5kohm. Bjts can be thought of as voltage controlled current sources but are more simply characterized as current controlled current sources or current amplifiers due to the low impedance at the base. Therefore the following components are required to make a voltage controlled variable current source op amp lm358 mosfet irf540n shunt resistor 1 ohm 1k resistor. I want to design voltage controlled current source for my current project.

The input and output output impedances are both ideally infinite and for your model they are made very big. A vccs ideal transconductance amplifier has a current output controlled by a voltage input. The lt1006 is a typical precision op amp. My idea was to use unity gain amplifier together with the buffer in the configuration like this.

Dependent sources are useful for example in modelling the behavior of amplifiers.