Ecet310 Week2 Hw
1 . Assume that a receiver includes a first augmenter stage having a 5K input resistance, a gain of 300, an input audio signal of 20 V, and an operating temperature of 27oC. When the amplifier is definitely operating having a bandwidth to begin 10 MHz, find
(a) the rms input noise levels
(b) the audio output levels
(c) the rms outcome noise levels
PN sama dengan noise electrical power in watts
Tk sama dengan 27°C & 273 = 300°K
a) Noise level Pn(in) = KT(k)BW = (1. 38x10-23)(300°K)(10MHz) = 41. four x 10^-15 W
b) Ps(out) = Gain * Ps(in) = 60mW
c) Pn(out) = Gain * Pn(in) = 12. 42pW
installment payments on your We have an amplifier using a 1 MHz bandwidth and a 20 V suggestions signal. The input sound = you V, result signal sama dengan 6. 0 mV, and output noises = you mV. Locate
(a) SNR at the input
(b) SNR at the output
(c) Noises figure
a) SNRi = Psi / Pni sama dengan Vsi^2 as well as Vni^2 sama dengan 400
b) SNRo = Pso as well as Pno = Vso^2 as well as Vno^2 sama dengan 36
c) NF sama dengan SNRi as well as SNRo = 11. eleven
3. A great FM recipient has SNR = forty-eight at the type and SNR = doze at the result. Calculate the receiver's noise figure in dB's.
NF = SNRi as well as SNRo = 4
NF(dB) = 12 log4 sama dengan 6. 02dB
4. A 300 resistor is usually connected across the 300 antenna input of a tv set receiver. The bandwidth of the receiver is 6 Megahertz, and the resistor is at place temperature (20oC). Find the noise electrical power and noises voltage applied to the recipient input.
Pn = KTBW = twenty-four. 26 back button 10^-15 T
Vn sama dengan = (24. 26x10^-15 W) * (300Ω) = 2 . 7µV
your five. The signal at the input of an augmenter has an SNR of 42 dB. In case the amplifier provides a noise physique of six db, precisely what is the SNR at the outcome (in dB's)?
SNRo sama dengan SNRi / NF = 7dB
A three-stage amplifier is definitely shown. The operating bandwidth is five-hundred KHz at a temperature of 25o C. The output load is definitely 1000.
(a) Calculate the entire power gain in dB's and as many (b) Compute the total NF as a number
(c) Calculate the output noise electric power
(d) Calculate the output noise voltage
Ap1=10, Ap2=31. sixty two, Ap3=3. sixteen
NF1=1. fifty eight, NF2=3. 16, NF3=2. fifty-one
a) Ap(T) = twelve + 12-15 + your five = 30dB
Ap(T) sama dengan 1000
b) NFT = NF1 + = 1 . 8
c) Pn(in) = KTBW sama dengan 2 . 06x10^-15 W
Pn(o) = NFT * Ap(T) * Pn(in) = a few. 71pW
d) Vn sama dengan = 3. 71µV
several. The noise input electrical power is one particular pW/Hz. Decide the output noise power.
Ap(T) = 40dB = 10000
Pn(o) sama dengan Pn(i) * Ap(T) 5. BW = 10mW
Home work 2_2
fCUTOFF = 145 KHz
T = 25 Sec
Draw the frequency variety of the outcome of the low pass filtration.
the time period is T sama dengan 25 usec = 25 x 10^-6 sec
the frequency is f = (1/T)
the cutoff regularity is fco = 130 kHz = 130 x 10^3 Hz
the output frequency is
fo = fco - farrenheit
EP-P = 12-15 V
Big t = two hundred and fifty SEC
2 . Draw the frequency spectrum of the outcome if the filter is: 13 marks
An increased pass filterfC =20 KHz
the time period is usually T sama dengan 250 usec = two hundred and fifty x 10^-6 sec
the frequency can be f = (1/T)
the output frequency will probably be
fo = fc - f
1 . The bandwidth of any series resonant circuit can be 400 Hz.
(a) In case the resonant frequency is 4000 Hz, find Q.
(b) If Ur = 10Ω, what is the importance of XL by resonance?
(c) Find the inductance D and capacitance C of the circuit.
a) Q = fr/BW = 4000Hz/400Hz sama dengan 10
b)XL = Q * R = 12 * 10Ω = 100Ω
c)At reverberation XL = XC = 100Ω
T = XL / (2π*fr) = 100Ω / (2π*4000Hz) = a few. 99mH = 4mH
C = you / (2π*fr*XC) = 1 / (2π*4000Hz*100Ω) = 397. 89nF = 0. 4µF