Lab_5_2C_2009

Lab_5_2C_2009 - 1 © Bob York ECE 2C Laboratory Manual 5...

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Unformatted text preview: 1 © Bob York ECE 2C Laboratory Manual 5 Infrared PWM Receiver Overview In this lab you will construct the receiver circuit to complement the PWM transmitter board you assembled last week. This receiver detects, amplifies, and demodulates a 40   kHz PWM infrared signal. In the 1 st week you will construct the receiver circuit with some rudimentary testing. In the second week we will put together a complete system combining the microphone and amplifier circuits of Lab 1, and explore the limits of the system with respect to operating distances. Table of Contents Pre-lab Preparation 2 Parts List 2 Full Schematics for IR PWM Receiver 3 In-Lab Procedure 4 5.1 Detector/HP Filter Section 4 5.2 Signal Conditioning Circuit 5 5.3 Demodulation 6 2 Infrared PWM Receiver © Bob York 2 Pre-lab Preparation You have two weeks to complete this lab. Read through the lab experiment to familiarize yourself with the components and assembly sequence, and complete the calculations below. Before coming to the lab, each group should obtain a parts kit from the ECE Shop. Bring your solder-less breadboard, tools, & wire jumpers, as well as the IR transmitter from Lab 4 and the power-supply from ECE 2B. Required calculations: □ Determine the maximum capacitance C8/C9 in the 2 nd-order HP filter stage that will give at least 26dB of rejection at 120 Hz. What is the resulting HP cutoff frequency? C8/C9=______________uF HP f =______________Hz □ For a peak photodiode current photo I , find an expression for the signal voltage after the first four op-amp stages (i.e. at the output of U3D). Express your answer in terms of R12-R20. out V = _______________________________________________________________ Parts List Qty Description Circuit Semiconductors 2 Op-Amp, LF347N (DIP-14) U3, U4 4 DIODE, 1N4148 D1-D4 2 n-ch JFET, 2N5485 Q3,Q4 Passives 8 RESIST OR, 1k Ω 10% 1/4W R13, R15, R17, R18, R19, R21 2 RESIST OR, 2.2k Ω 10% 1/4W 3 RESIST OR, 4.7k Ω 10% 1/4W R14, R16, R20 4 RESIST OR, 47k Ω 10% R12, R25 6 RESIST OR, 10k Ω 10% 1/4W R24, R26-29 2 RESISTOR, 100k Ω 10% R22 1 POTENTIOMETER, 2k Ω R23 1 CAPACITOR, 10pF 20% C7 1 CAPACITOR, 0.001μF 10% (low-volt ceramic) C12 2 CAPACITOR, 0.0022μF 10% (low-volt ceramic) C13, C14 2 CAPACITOR, 0.047μF 10% (low-volt ceramic) C8, C9 1 CAPACITOR, 0.01μF 20% 8 CAPACITOR, 0.1μF 20% C5, C6, C10, C11, C15, C16 2 CAP_ELECTROLIT, 100μF 20% Pre-lab Preparation 3 © Bob York 3 Full Schematics for IR PWM Receiver Figure 5-1 – Schematic for the Analog Infrared PWM Receiver. 4...
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This note was uploaded on 12/28/2011 for the course ECE 2C taught by Professor Yue during the Fall '08 term at UCSB.

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Lab_5_2C_2009 - 1 © Bob York ECE 2C Laboratory Manual 5...

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