# mid2 - TEST Student's Name: Utah State University ECE 3410...

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Student’s Name: A wireless signal is used to send power and data into an implanted drug-delivery device. The signal consists of a 100kHz sine wave modulated with a 1kHz square wave. The square wave represents digital data. PROBLEM 1 An antenna picks up the wireless signal and delivers it as a current, i S . The current is input to a bridge rectifier as shown below. All diodes have a forward drop of 0.7V at 1mA and n=1.5. The thermal voltage is 25mV. On the following page, draw the rectified signal waveform as accurately as possible. Utah State University page 1 of 9 ECE 3410 - Microelectronics I Midterm 2 TEST 0.75mA -0.75mA -1mA i S t 1mA 0mA R S i S R L v R Antenna Signal R S = R L = 20k Ω

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Draw the output waveform on the axes below. Label the axes accurately, and label the signal’s maxima and minima. Utah State University page 2 of 9 ECE 3410 - Microelectronics I Midterm 2 TEST
PROBLEM 2 Now we’ll add a capacitor to convert the rectifier to a peak detector, as shown below. Our goal will be to filter out

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## This note was uploaded on 05/03/2010 for the course ECE 3410 taught by Professor Cripps,d during the Spring '08 term at Utah State University.

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mid2 - TEST Student's Name: Utah State University ECE 3410...

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