ECE231H1 Chapter Notes - Chapter 1: Decibel, T Power, Linear Amplifier

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periwinklechimpanzee944

27 Jan 2019

School

UTSG

Department

Electrical and Computer Engineering

Course

ECE231H1

Professor

Olivier Trescases

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Document Summary

Vsl4=rs(cid:8869) signalamplifie. rs# that signals transducer produces are too weak ( v or mv ) A = amplifier gain c linear amplifier ) amplifier voltage-gated. 20 log i avl db with have greater power power gain than that obtained from. : wi w provide load amplifiers great that amplifier deliver to load : io= . *= =io =:: :: o current draws from signal source in decibel power gain. Ap=av- power gain = voltage gain x current gain in decibel current gain. Av signals , or air means doesn"t mean there is amplifier is. 1800 phase attenuating the difference signal between input and. Pdc t pi d drawn power from signal. Amplifiersaturati# input signal must keep within linear range of operation negative. Equation : av=i = i t gain factor of voltage control ( voltage gain of tpeitvagegaii unloaded. Idealvohageahfie not losing gain when coupling amplifier output to a load. A overall voltage gain : assume if rc is.

Related Questions

Question 3 (IEIIQ16)

A 3 W rated Zener diode is used in a shunt voltage regulator circuit to supply a dc output of 12 V to a variable load with a minimum resistance of 240 Ω. The supply voltage varies between 20 V and 24 V.

3.1 Draw the circuit diagram.

3.2 Calculate the range of series resistance that may safely be used in this circuit. Select a single suitable standard value.

3.3 Calculate the maximum power rating required for the series resistor.

Question 4 (IEIIQ17)

A simple Zener voltage regulator is required to provide a steady regulated output voltage of 10 V under a maximum load of 80 mA, while the input voltage to the regulator varies between 12 V and 14 V.

17.1 Calculate the maximum rated current value of a Zener diode to be used

17.2 Calculate the minimum power for the Zener that could be used safely.

17.3 If a 5 W rated Zener were to be used in this circuit:

(i) Calculate the maximum rated current value of a Zener device to be used

(ii) Calculate the range of possible RS. limiting resistor values.

(iii) Suggest a suitable standard E12 resistor value

tongamall66

Question 1

A simple Zener diode shunt voltage regulator is to supply 12 V to a load which normally draws a load current which varies from 0 to 50 mA. The input voltage varies between 15 V and 18 V.

1.1 Calculate the maximum rated current value of a Zener device to be used.

1.2 Calculate the minimum power for the Zener that could be used safely.

1.3 If a 5 W rated Zener were to be used, calculate the range of possible RS. values and hence suggest a suitable standard E12 resistor value.

1.4 State four (4) conditions under which a Zener diode dissipates minimum power in a regulator circuit.

Question 2 (IEIIQ15)

A 2.5 W Zener diode is used in a simple Zener shunt voltage-regulator to supply 5.1 V to a load which normally draws a load current varying from 0 to 125 mA. The input voltage varies between 8 V and 9.5 V

2.1 Give two (2) reasons for the inclusion of the series resistor in the Zener-regulator circuit.

2.2 Calculate the range of series resistance that may safely be used in this circuit.

2.3 Select a single suitable standard E12 resistor value and give its colour code with 1 % tolerance.

maponyamall30

Kindly solve the below questions:

1. Assume the AC frequency is 50 Hz. Convert these phasors to signals (remember that phasor magnitudes are RMS values of the signals)

(a) V = 115∠90V

(b) I = 10 + 10j A

2. Convert these signals to phasors (remember to us RMS values for the phasor magnitude)

(a) v(t) = 230cos (314t + 20

) V

(b) i(t) = 5cos (314t + 10

) A

3. Suppose the voltage across a load is v(t) and the current drawn is i(t) where

v(t) = 230cos (314t + 20) V

i(t) = 5cos (314t + 10

) A

(a) calculate the complex power, real power, reactive power and apparent power.

(b) calculate the power factor and indicate if it is leading or bagging

courseh170

ECE231H1 Chapter Notes - Chapter 1: Decibel, T Power, Linear Amplifier

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