EE 164 Problems Set 10 Solution

# EE 164 Problems Set 10 Solution - EE 164 Problem 1 Problem...

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

EE 164 Problem Set 10 Spring 2005 Problem 1: Design an analog modulator like that shown in the below figure by using a silicon transistor. For this transistor, 60 β = .Set the DC bias at 50 mA . 50 , in R = 3, a R K =Ω 6 b R K and the bias supply voltage is 10 V . When the light source is on, its voltage drop is 1.8V. in V in R b R a R c R C dc V c e b B I c I E I LED a) Compute the value of the emitter resistance e R . b) Compute the collector-emitter voltage at the Q point.

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

View Full Document
c) Figure out the maximum modulation factor this circuit can provide. Problem 2: The LED whose output characteristic is shown in the below figure is used in a two-channel frequency-division-multiplexed system. The LED total harmonic distortion is measured as 25 dB when a sinusoidal current with a 50 mA peak is applied. The bias current is set at 50 mA. The AM modulation of each subcarrier is 50%. The intensity modulation is 100%. The subcarriers are at 1 MHz and 2 MHz and have equal peak currents. The information is a1000 Hz tone for both

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 4

EE 164 Problems Set 10 Solution - EE 164 Problem 1 Problem...

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

View Full Document
Ask a homework question - tutors are online