1. 類比通訊系統 2008/11/24 金正元

2. Outline Introduction Transmission Line Filter Amplifier Mixer

3. Introduction You are going to complete this part. 980MHz 900MHz

4. Introduction Crystal Oscillator at 100MHz and BPF 900MHz

5. Introduction

6. What’s Transmission Line? A transmission line is the material medium or structure that forms all or part of a path from one place to another for directing the transmission of energy, such as electromagnetic waves or acoustic waves, as well as electric power transmission. Components of transmission lines include wires, coaxial cables, dielectric slabs, optical fibers, electric power lines, and waveguides.

7. Miscellaneous Transmission Lines

8. Design 中心頻率 (980MHz) 傳輸線結構 (microstrip line) 板材 (FR4) 板子厚度 (0.8 mm) 特徵阻抗 (50 ohm)

9. Design

10. Relative Permittivity How about microstrip line ?

11. Relative Permittivity

12. Filter Why do we need a filter?

13. Filter Types

15. Maximally flat Equal-ripple Linear phase

16. Filter Types Lumped Distributed

17. Coupled-Line Filter Each section is 0.25 lambda long.

18. Coupled-Line Filter It is very close to the practical value 42.4 !! We can use this formula to calculate our effective relative permittivity.

19. Amplifier

20. R1: bias C1: input match C2: output match C3: 900MHz short C4: RF decoupling

21. Layout of Amplifier

22. Mixer Mixer = Multiplier !? Active Nonlinear

23. Diode Mixer

24. FET Mixer

25. Layout of Mixer

26. The End *^.<*