Voltage Controlled Amplifier Ic

The vcr is one of the numerous interesting circuit elements that can be produced by using a jfet junction field effect transistor with simple biasing.

Voltage controlled amplifier ic.

At some voltage level the entire signal is let through. That corporation unveils the new that 2162 the company s first dual blackmer voltage controlled amplifier vca ic. The ic ideal for use in stereo amplifier applications. The amplifier can achieve an 80 db dynamic control range with less than 0 2.

The vca810 is a dc coupled wideband continuously variable voltage controlled gain amplifier. They are very high performance current in current out devices with two opposing polarity voltage sensitive control ports. The device provides a differential input to single ended output conversion with a high impedance gain control input used to vary the gain over a 40 db to 40 db range linear in db v. This voltage controlled amplifier circuit is simply an op amp having an additional input at pin 5.

That 2180 series integrated circuit voltage controlled amplifiers vcas are very high performance current in current out devices with two opposing polarity voltage sensitive control ports. A simple linear voltage controlled amplifier can be constructed with one op amp and two jfets see the figure. Things that can force changes to this circuit are many but are mostly limited to larger and smaller input signals and higher or lower supply voltage ranges. A voltage controlled amplifier can be realised by first creating a voltage controlled resistor vcr which is used to set the amplifier gain.

A vca or voltage controlled amplifier lets you use a voltage to control the amount of another signal that is allowed through to the output of the module. The higher the control voltage the more signal is passed. The soundlazer vca offers a wide range exponential control of gain and attenuation with low signal distortion. Figure 8 shows how two amplifiers of the figure 7 type can be used together to make a voltage controlled stereo amplifi er.

Thus by inserting an audio signal 10 mv within pin 2 and 3 and with controlling the current on pin 5 the amount of the signal output pin 6 is controlled. A current ilsc is inserted into this input which controls the gain of the device linerly. The part is a low cost space saving solution for multi channel vca applications. They offer wide range exponen tial control of gain and attenuation with low signal distortion.

The parts are trimmed at wafer stage for low thd and control. The part delivers great performance in a tiny package offering 118db dynamic range 130db gain control range and distortion under 0 1 without any adjustment. This voltage controlled amplifier is fully functional and tested.