What is a Variable Gain Amplifier?
A variable gain amplifier, or VGA, is a signal-conditioning amplifier with an electronically settable voltage gain. There are analog variable gain amplifiers and digital variable gain amplifiers. An analog voltage controls the gain and either a functional source, a digital to analog converter or a dc source can provide the control. In analog variable gain amplifiers, gain in dB is a linear function of the input voltage.
Types of Variable Gain Amplifiers
There are many different kinds of variable gain amplifiers and at Future Electronics we stock many of the most common types categorized by gain, nominal gain bandwidth, maximum supply voltage, nominal slew rate, packaging type and number of channels. The parametric filters on our website can help refine your search results depending on the required specifications.
Nominal gain bandwidth can be 90 MHz, 130 MHz or 850 to 2500 MHz. The maximum supply voltage can be between 3 V and 9.5 V, and the nominal slew rate can be either 0.275 V/µs or 275 V/µs.
Variable Gain Amplifiers from Future Electronics
Future Electronics has a full selection of variable gain amplifier chips from manufacturers that can be used to design a variable gain op amp circuit or for any other equipment that might require a variable gain amp. Simply choose from the variable gain amplifier technical attributes below and your search results will quickly be narrowed to match your specific variable gain amplifier application needs.
We deal with New Japan Radio and NXP as manufacturers. You can easily refine your variable gain amplifier product search results by clicking your preferred variable gain amplifier brand below from our list of manufacturers.
Applications for Variable Gain Amplifiers:
Variable gain amplifiers are useful in order to tame signals exhibiting a wide dynamic range. A good example would be mobile phone receivers. Depending on the distance between the cell phone and the base station, the input signal levels vary greatly. Other typical applications with a wide dynamic range are found in the industrial, medical and scientific sectors in measurement equipment. Generally, a variable gain amplifier might be used in two circumstances. The first is in situations where one needs to match an input signal level to the full scale input of a device (for example an FM discriminator or an ADC). The second is in situations where one might need to scale a fixed input voltage in order to compensate for variable losses (for example in order to adjust the voltage level to a given transmission line).
Choosing the Right Variable Gain Amplifier:
When you are looking for the right variable gain amplifiers, with the FutureElectronics.com parametric search, you can filter the results by various attributes: by Nominal Gain Bandwidth (90 MHz, 130 MHz, 850 to 2500 MHz), Nominal Slew Rate (0.275 V/µs, 275 V/µs) and Maximum Supply Voltage (3 V, 5.25 V, 9.5 V) to name a few. You will be able to find the right semiconductor chip from our manufacturers that can be used to design a variable gain op amp circuit or for any other devices that might require a variable gain amp.
Variable Gain Amplifiers in Production Ready Packaging or R&D Quantities
If the quantity of variable gain amplifiers required is less than a full reel, we offer customers many of our programmable variable gain amplifier products in tube, tray or individual quantities that will avoid unneeded surplus.
In addition, Future Electronics offers clients a unique bonded inventory program that is designed to eliminate potential problems that may arise from an unpredictable supply of products containing raw metals and products with erratic or long lead times. Talk with your nearest Future Electronics branch and find out more on how you and your company can avoid possible shortages.