# electrical report

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Digital Radio : Figure 1: Block diagram of the digital radio transmitter Figure 2: Block diagram of the digital radio receiver Transmitter circuit: I. L1 V1 -10V VDD 1m 10Vdc Q1 Q2N3904 U2 C1 10n 0 R1 1Meg - + OPAMP M2 Mbreakn OUT L2 C3 1m 39p 0 OUT - C2 10n + U15 VoutAntenna Q2N3906 OPAMP R6 M3 Q2 50k C4 Mbreakp +10V R3 1k 0 R12 0 C5 10u 0 R5 40k 0 +10V 0 1k R11 - 0 R7 1k 1Meg R2 500k R10 100 0 100n R4 Vee R8 M5 Mbreakn R9 10k 19k VDD V12 10 Vee V13 -10 OPAMP 1k V1 = -10 V2 = 10 TD = 0 TR = 10u TF = 10u PW = 1m PER = 2m OUT V14 -10V 0 0 + U1 0 0 Figure 3: Transmitter expected output (GREEN). Input voltage (RED) 1) Colpitts Oscillator with a buffer. L1 V1 1m 10Vdc C1 10n R1 1Meg C3 39p - OPAMP OUT L2 1m C2 10n 0 + U15 C4 M5 100n R4 Mbreakn 1Meg R2 500k R3 1k 0 0 C5 10u R5 40k 0 0 Figure 4: GREEN is the colpitts oscillator output and RED is the output between the two resistors 2) Digital Signal : M2 Mbreakn M3 Mbreakp Vpositiv e10 R3 R25 Vpositiv e10 1k - OPAMP 1k V1 = -10 V2 = 10 TD = 0 TR = 10u TF = 10u PW = 1m PER = 2m OUT V14 Vnegativ e10 + U1 0 0 NMOS parameters : kp = 125u Vto= 2.5 L=100u W=100u lambda=0.01 PMOS Parameters kp = 125u Vto= 2.5 L=100u W=100u lambda=0.01 Figure 5: input voltage (RED) and Output voltage (GREEN) 3) Class B amplifier : VDD Q1 Q2N3904 U2 + VoutAntenna R9 10k OUT - Q2N3906 OPAMP R6 Q2 50k Vee R10 100 R8 0 0 R7 1k 19k VDD V12 0 10 Vee V13 -10 0 0 Op-amp is used to amplify the voltage to 5V Figure 6: Input voltage (RED) and Output voltage (GREEN) II. Receiver: VoutTransimitter R8 R10 19k 19k C16 R7 U3 re1 + R9 1k 0.001u U4 OUT - + 1k - re3 15.9k C17 0.001u 7.96k OUT OPAMP - OPAMP OPAMP D2 OUT + U14 re2 162.4 D1N3940 C5 0.047u R14 200 U7 + 0 0 0 0 0 0 D3 OUT - D1N3940 OPAMP R21 2k VDD R22 8k V R20 1k R19 1k 0 0 Figure 7: Input Voltage (RED) and expected output voltage of the Receiver (GREEN) 1) RF amplifier: R7 R8 R10 19k 19k U3 + R9 1k U4 OUT + 1k - OUT OPAMP - 0 0 OPAMP Figure 8: Input Voltage(RED) and Output Voltage (GREEN) 2) Band Pass Filter : C16 re1 re3 15.9k 0.001u C17 0.001u 7.96k OUT + U14 re2 162.4 0 OPAMP 0 Figure 9: Bode Plot (top) and Frequency plot (bottom). Input Voltage (RED) and Output Voltage (GREEN). MATLAB: % Band Pass Filter: w= 2*pi*100e3; %frequecny k = 1 ; %Bandpass gain Q=5; C = 0.001e-6 ; %pick up any value %Req= (R1*R2)/(R1+R2) ; %B= 2/R3C %KB = 1/R1C ; %sys=tf([0 -KB],[1 B w^2]); r1 = Q/k ; r2 = Q/(2*(Q^2) - k) ; r3 = 2*Q ; kf = w ; %scaling factor km = ((1/C))/(kf); %scalar R1 = km * r1 ; R2 = km * r2 ; R3 = km * r3; 3) Envelope Detector : D2 D1N3940 C5 0.047u R14 200 0 0 Figure 10: Input Voltage (RED) and output voltage (GREEN) 4) Comparator : U7 + D3 OUT VDD R22 8k - D1N3940 OPAMP R21 2k V R19 1k 0 NOTE : The output MUST be 5V. R20 1k 0 Due to the Op-amp Vcc which is +15 by default in PISPICE, two resistors were used to drop the output voltage to almost 5V. Figure 11: Input voltage (RED) and output voltage (GREEN)
 The interim report for the project should have the following format: 1- Abstract: That is one paragraph that describes the project, and was simulated, and the outcome conclusion of the simulation. Key specifications maybe mentioned. 2- Introduction: a- You need to explain what is the overall project, and describe the block diagram of the system module by module. What are the expected signals of each modules. b-Do not included any circuits, you need to describe the blocks. c- Detailed description of the specifications (VDD, -VSS, bit rates, carrier frequency, power, antenna,...) 3- Theory: in the theory section you need to describe the circuit used to design each module, the theoretical equations and the design values. This must be supported by the PSPICE simulation. you should have every circuit simulated from the collpitts oscillator all the way to the output the comparator.  The format of the report have to be as follows: Cover Sheet: Include your name and the name of your lab partner(s) along with the date and title of the experiment. Abstract: A condensed version of a longer piece of writing that summarizes and highlights the major points. Include the conclusions and any recommendations made. Introduction: Provide readers with any general information they must have to understand the detailed information in the report. Include the subject and purpose of your report. Theory: Give the theoretical background for the experiment, including simulation results. Provide mathematical models of circuit as well as PSPICE simulation results. Methodology: Describe, in general, how the design, fabrication, and/or measurement process was performed. Include circuit schematics and diagrams of your setup. Results and Analysis: Compare your results to your predictions and interpret the outcome for your reader. A lab report analysis describes significant observations. Label and explain all figures and graphs. Conclusions: Draw from the analysis of the data. The conclusions should not be a recapitulation of the results. Recommendations: The author makes recommendations that follow logically from the data and conclusions in the report. References: In writing your report, you must document all information and ideas obtained from others. Appendices: Includes supporting data, derivations, figures, calculations, PSPICE or MATLAB code.

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