What is reference voltage generator?
A voltage reference generator produces a constant voltage independent of the temperature and supply voltage [1]. Implementations of voltage reference generators, known as Bandgap Voltage Reference (BGR) Generators, usually, were designed to generate a constant voltage around 1.26 V at 27 °C (300 K).
Why is voltage reference needed?
A voltage reference is a precision device specifically designed to maintain a constant output voltage, even as parameters such as ambient temperature or supply voltage change. The precision of a voltage reference enables its use in several differ- ent types of applications beyond a data converter.
How are voltage references used in a circuit?
Voltage references typically provide this known potential for as long as the circuit is switched on and drawing power. This means that other components can measure the types of input signal that are important to their specific roles against a constant standard, and thus accurately interpret them.
When do you use a shunt voltage reference?
Shunt voltage references are two-terminal models designed for operation within a specified current range, where the reference operates in parallel with its load. When not under a load, the shunt reference sinks just enough current to achieve the desired output voltage with regards to voltage drop.
When do you use a bandgap voltage reference?
A bandgap voltage reference is a temperature-independent circuit. This type of component is becoming increasingly popular in voltage reference ICs. It is used to produce a fixed (constant) voltage regardless of fluctuations in the power supply, circuit loading from a device, or – most crucially – operating temperatures.
Which is the best 5% accurate voltage reference?
On the low end of the reference accuracy continuum, we have the lowly zener diode. It is readily available and 5% accurate devices are inexpensive. A 5.1V, 1N751A zener can be purchased for about a dime and is a good starting point for our discussion.