Question

In control systems, excessive bandwidth is NOT employed because:
1. noise is proportional to bandwidth
2. it leads to low relative stability
3. it leads to slower response
4. noise is proportional to the square of the bandwidth

Answer 1

Correct Answer - Option 1 : noise is proportional to bandwidth

Noise power is given as:

Pn = KTB

Where,

K = Boltz man's constant

T = temperature

B = Bandwidth over which noise is measured

When the bandwidth is increased, then system becomes fast as it reduces rise time, increases stability as well as reduces oscillations in the response but according to the above equation, the noise also increases.