Variable Gain Amplifier Circuit. Variable gain amplifiers often use a mechanical potentiometer to set the gain. The vga uses ac coupling highpass filter for dc offset rejection while each vga stage is designed to have constant output offset to overcome the slow response of the highpass filter.
Variable gain amplifiers deliver unmatched performance for signal chains that require high dynamic range. A variable gain or voltage controlled amplifier is an electronic amplifier that varies its gain depending on a control voltage. Op amp variable gain circuit.
A voltage controlled amplifier or variable gain amplifier is an electronic device amplifier that varies its gain depending on the applied control voltage cv.
The vga uses ac coupling highpass filter for dc offset rejection while each vga stage is designed to have constant output offset to overcome the slow response of the highpass filter. The gain can thus be made variable by replacing r1 with a pot and connecting its slider to the inverting terminal of the op amp as shown in the circuit in figure 4 in which the gain can be varied over the range x1 to x101 via rv2. Consider the circuit schematic presented in figure 4. Mmic die to high power instrumentation amplifiers from dc to 44 ghz.
