# Ecet310 Week2 Hw

Homework 2_1

ECET310

NOISE

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

six.

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

ECET310

1 .

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

Research 2_3

ECET310

RESONANT-TUNED OUTLET

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

I (mA)...