simulation of a superheterodyne receiver using pspice - School of ...

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PAGE INDEX: TITLE PAGES DIT cover page. 1 Title page. 2 Page Index. 3 Chapter 1: Project Organisation. 4 Chapter 2: Introduction. 5-7 Chapter 3: Technical description and construction details (including test procedures and results). Part 1: Generation of an AM wave. 8-11 Part 2: Design of a single tuned RF amplifier. 12-15 Part 3: Local Oscillator design. 16-24 Part 4: Design of mixer circuit. 25-27 Part 5: Design of IF stage. 28-31 Part 6: AM detection with AGC. 32-35 Part 7: Design of pre-amplifier and power amplifier. 36-39 Chapter 4: Final tests and results (hierarchy structure). 40-51 Chapter 5: Conclusions 52-55 Appendix A: Software used. 56 Appendix B: References. 57 Appendix C: Scale suffixes. 58 Appendix D: Schematics and probes. 59 Acknowledgement. 60 2
CHAPTER 1: PROJECT ORGANISATION. The purpose of this project was to simulate a complete superhetrodyne receiver using Pspice. Initially the project was broken into eight separate blocks to be designed and tested separately and then to be implemented together using hierarchical methods. The blocks were divided as follows; I concentrated on the RF amplifier, the IF amplifiers and the audio amplifier and Gavin took charge of the AM wave generation, the mixer and the AM detection with AGC. The local oscillator circuit provided most problems and was mainly dealt with simultaneously. However it must be noted that strict adherence to these divisions was not followed as problems arose with circuits and often problem solving was dealt with by consultation. Another reason for this was that a better understanding of the complete circuit was obtained from working on all sections of the project. CHAPTER 2: INTRODUCTION. 3
Page 1: SIMULATION OF A SUPERHETERODYNE REC
Page 5 and 6: modulating signal (Sensitivity). A
Page 7 and 8: amplitude of the carrier wave varie
Page 9 and 10: Fig. 3: Amplitude Modulator. Settin
Page 11 and 12: This is a quite high value, which m
Page 13 and 14: R Total IN IN 5 = R1 R2 R = 80k 50k
Page 15 and 16: was assumed that the drain-source r
Page 17 and 18: A V = g m R L = 5.56X10 −3 X1X10
Page 19 and 20: 1 Substituting for ω 2 = . LC T β
Page 21 and 22: −3 3 VD = VDD − I DRD = 20V −
Page 23 and 24: Ref. [6] Appendix B Fig. 21: Mixer
Page 25 and 26: Values for the second LC tuned circ
Page 27 and 28: Fig. 24: Double tuned IF amplifier.
Page 29 and 30: Fig. 28: Enlarged section of diode
Page 31 and 32: Fig. 30: AGC and audio signals. The
Page 33 and 34: I C 22.02mA BJT Q12 (pnp transistor
Page 35 and 36: The middle section of the hierarchy
Page 37 and 38: Fig. 40: Block 4 - Local oscillator
Page 39 and 40: Fig. 44: Block 8 - Audio amplifier.
Page 41 and 42: The first major test for the superh
Page 43 and 44: spectrum. However, as long as the I
Page 45 and 46: Fig. 50: Modulating frequency in AM
Page 47 and 48: * Working on the IF stages of the d
Page 49 and 50: are very important) combated this p
Page 51: Fig. 18: Local Oscillator (Amplifie

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