Noise
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Noise
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22 Questions

1. Low frequency noise is
2. For a two stage amplifier, first amplifier has Voltage gain = 20, Input Resistance Rin1=700Ω, equivalent Resistance Req1=1800Ω and Output Resistor Ro1 = 30KΩ. The corresponding values of second amplifier are : 25, 80 KΩ, 12 KΩ, 1.2 MΩ respectively. What is the value of equivalent input noise resistance of the given two stage amplifier?
3. At a room temperature of 300K, calculate the thermal noise generated by two resistors of 10KΩ and 30 KΩ when the bandwidth is 10 KHz and the resistors are connected in parallel.
4. The Noise Factor for cascaded amplifiers (FN) is given by (F1, F2, F3 .. FN, G1, G2, G3....GN) are the noise factors and the gains of the amplifiers at different stages:
5. The noise voltage (Vn) and the signal bandwidth (B) are related as
6. Transit time noise is
7. Figure of merit γ is
8. For a two stage amplifier, first amplifier has Voltage gain = 20, Input Resistance Rin1=700Ω, equivalent Resistance Req1=1800Ω and Output Resistor Ro1 = 30KΩ. The corresponding values of second amplifier are : 25, 80 KΩ, 12 KΩ, 1.2 MΩ respectively. What is the value of equivalent input noise resistance of the given two stage amplifier?
9. Noise is added to a signal in a communication system
10. The Hilbert transform of the signal sinω1t + sinω2t is
11. Low frequency noise is
12. Noise factor for a system is defined as the ratio of
13. Noise voltage Vn and absolute temperature T are related as
14. Hilbert transform may be used in
15. Noise voltage Vn and absolute temperature T are related as
16. Notch filter is a
17. Noise Factor(F) and Noise Figure(NF) are related as
18. At a room temperature of 300K, calculate the thermal noise generated by two resistors of 10KΩ and 20 KΩ when the bandwidth is 10 KHz.
19. Signum function sgn(f), for f>0, f=0 and f<0, has the values:
20. For a three stage cascade amplifier, calculate the overall noise figure when each stage has a gain of 12 DB and noise figure of 8dB.
21. In Hilbert transform of a signal, the phase angles of all components of a given signal are shifted by
22. The noise due to random behaviour of charge carriers is

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