quiz_1_2007_solution

quiz_1_2007_solution - Question 1A You would like to design...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Question 1A You would like to design an amplifier to use your MP3 player in your car. The amplifier should not provide less than 40W of signal power to a speaker whose resistance is 10 . The MP3 player’s audio jack provides a 100mV signal and has a resistance of 5K . Out of your drawer, you take out three amplifier stages: a) High input resistance: R IN = 1M , R OUT = 10K , A VO = 10V/V b) High gain: R IN = 10K , R OUT = 1K , A VO = 100V/V c) Low output resistance: R IN = 10K , R OUT = 10 , A VO = 1V/V 1) What kind of amplifier is this (A V , A IS , R MO , G MO )? Based on the configuration to best maximize the gain for a single stage amplifier of this type, in what order should the amplifiers be connected? A V , or Voltage amplifier. The amplifiers should be put (from input to output): (a), (b), (c) because you want high Rin and low Rout. 2) What is the minimum output voltage required to drive the speaker? What is the minimum gain? P = V 2 / R L Æ V = 20 V Therefore A VO = 20V/0.1V = 200 V/V 3) Based on the configuration in (1), what gain can you realize? What is the resulting output and output power? Gain = (1) * (100) * (10) * (10/20) * (10K/11K) * (10K/20K) * (1M/(1M + 5K)) Gain = 226.1 V/V Therefore load voltage = 226.1 V/V * 0.1 V = 22.61 V Power = V 2 / R L = 51.1 W
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Question 3A The circuit below contains two diodes having n=1. Solve parts a) and b) using the constant voltage drop model (CVDM) a) (2 pts) If the resistance R = 50 and V1 = V2 = 5 V, determine the current flowing in each diode. Voltage across R is 5 – 0.7 = 4.3 so current in R is 4.3/50 = 86mA and half of that (43 mA) flows in each diode. b) (2 pts) If the resistance R = 50 and V1 = 5 V and V2 = 6 V, determine the current flowing in each diode. In this case, D1 is clearly off (I=0) and voltage across R is 5.3 so there is 5.3/50 =106mA of current in D2. c)
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 10

quiz_1_2007_solution - Question 1A You would like to design...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online