How to obtain high rate of accuracy in comparator?a)Input offsetb)High...
High voltage gain causes comparator output voltage to switch between saturation levels. High CMRR rejects noise at input terminal and input offset (voltage & current) help to keep changes in temperature variation very slight.
How to obtain high rate of accuracy in comparator?a)Input offsetb)High...
To obtain a high rate of accuracy in a comparator, several factors need to be considered. These factors include input offset, high voltage gain, and high common-mode rejection ratio (CMRR). Let's discuss each of these factors in detail:
1. Input Offset:
- The input offset is the voltage difference required between the two input terminals of a comparator to produce an output voltage.
- Ideally, a comparator should have zero input offset, meaning there should be no voltage difference required between the inputs for the output to switch.
- However, in practical scenarios, there is always some input offset voltage present, which can introduce errors and affect accuracy.
- To obtain a high rate of accuracy, the input offset voltage should be minimized as much as possible.
2. High Voltage Gain:
- Voltage gain refers to the ratio of the change in output voltage to the change in input voltage.
- In a comparator, a high voltage gain ensures that even small differences in input voltages can be accurately amplified and detected.
- A high voltage gain allows the comparator to differentiate between input voltages that are very close to each other, increasing the accuracy of the comparison.
3. High Common-Mode Rejection Ratio (CMRR):
- CMRR is a measure of how well a comparator rejects common-mode signals present at its inputs.
- Common-mode signals are voltage signals that are present on both the non-inverting and inverting inputs of the comparator.
- A high CMRR ensures that the comparator responds primarily to the differential input voltage and rejects any common-mode voltage.
- By rejecting common-mode signals, the comparator can focus on accurately comparing the actual input voltages, improving the accuracy of the comparison.
By considering all these factors and optimizing them, a high rate of accuracy can be achieved in a comparator. Minimizing input offset, maximizing voltage gain, and increasing CMRR all contribute to reducing errors and improving the accuracy of the comparison.
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