What is the purpose of a programmable gain amplifier?
The PGA is used when an input signal has insufficient amplitude. You can put a PGA in front of a comparator, ADC, or mixer to increase the amplitude of the signal to these components. The PGA can be used as a unity gain amplifier to buffer the inputs of lower impedance blocks, including Mixers or inverting PGAs.
What are unity gain amplifiers used in?
The voltage follower or unity gain buffer is a special and very useful type of Non-inverting amplifier circuit that is commonly used in electronics to isolated circuits from each other especially in High-order state variable or Sallen-Key type active filters to separate one filter stage from the other.
What is a programmable gain instrumentation amplifier?
Programmable gain instrumentation amplifiers are a critical component in the data acquisition space, enabling good SNR performance, even with varying sensor sensitivities. The use of integrated PGIAs allows for shorter design time and better overall dc and ac performance for the front end.
What is programmable gain amplifier in ADC?
The Programmable Gain Amplifier (PGA) is designed to increase the dynamic range by amplifying low-amplitude signals before they are fed to the 16-bit ADC. 1.1 Abstract. Whenever a gain stage is included in the converter path, the Signal to Noise Ratio (SNR) will go down.
What does PGA mean in electronics?
A programmable-gain amplifier (PGA) is an electronic amplifier (typically based on an operational amplifier) whose gain can be controlled by external digital or analog signals.
How does a variable gain amplifier work?
A voltage-controlled amplifier or variable gain amplifier is an electronic device (amplifier) that varies its gain depending on the applied control voltage (CV). Also, variable gain amplifiers are in use in various applications, including synthesizers, amplitude modulation, and audio level compression.
Why unity gain buffer is used?
This is the reason unity gain buffers are used. They draw very little current, not disturbing the original circuit, and give the same voltage signal as output. They act as isolation buffers, isolating a circuit so that the power of a circuit is disturbed very little.
What dB is unity gain?
0 dB
A gain of factor 1 (equivalent to 0 dB) where both input and output are at the same voltage level and impedance is also known as unity gain.
What is meant by instrumentation amplifier?
An instrumentation amplifier (sometimes shorthanded as in-amp or InAmp) is a type of differential amplifier that has been outfitted with input buffer amplifiers, which eliminate the need for input impedance matching and thus make the amplifier particularly suitable for use in measurement and test equipment.
What is the full form of PGA?
British Dictionary definitions for PGA PGA. abbreviation for. Professional Golfers’ Association. Slang.
What does a VCO do?
VCOs are used in function generators, phase-locked loops including frequency synthesizers used in communication equipment and the production of electronic music, to generate variable tones in synthesizers.
What are the two types of voltage gain?
There are three different kinds of amplifier gain which can be measured and these are: Voltage Gain ( Av ), Current Gain ( Ai ) and Power Gain ( Ap ) depending upon the quantity being measured with examples of these different types of gains are given below.
In these applications, programmable gain instrumentation amplifiers (PGIAs) are a good solution for the front end to accommodate the sensitivities of the various sensor interfaces, while optimizing SNR. Integrated PGIAs are available to achieve good dc and ac specifications.
How can I make a photodiode amplifier with programmable gain?
One way to make a photodiode amplifier with programmable gain is to use a transimpedance amplifier with a gain that keeps the output in the linear region even for the brightest light inputs.
What is a programmable amplifier?
One common type of programmable amplifier is the VGA. Depending on the receiver architecture, the VGA could be placed either at IF in a dual conversion receiver for example 1 or at baseband as is always the case in a direct conversion receiver. The gain of the VGA may be continuously adjusted or adjusted in steps as is more commonly the case.
What is programmable gain and why is it important?
Having programmable gain allows engineers to design instruments that accurately measure very large dynamic ranges. This article shows how to ensure stability while achieving high bandwidth and low noise.