PCB Layout using ADS November 29, 2005 PCB Layout using ADS Dr. B. Frank Department of Electrical and Computer Engineering Queen's University Slide 1

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Transcription:

Dr. B. Frank Department of Electrical and Computer Engineering Queen's University Slide 1

Motivation Need circuit more reliable than breadboard? Working at RF/microwave frequencies? Printed circuit board (PCB) is a good solution Slide 2

PCB PCB done on a substrate such as FR-2 or FR-4, though at RF/microwave frequencies special low-loss substrates are used (often obtained free from Rogers Corporation) Slide 3

PCB Design Procedure Layout software is usually used to to draw the metallic traces, which tells milling machine where to move excess metal Via holes are drilled through the board as necessary to provide a path between the top and bottom of the board. The board is populated with transistors, RLC, integrated circuits, etc. Slide 4

Agilent's Advanced Design System (ADS) schematic capture circuit simulation electromagnetic simulation layout We will focus on using ADS for layout in this guide. Slide 5

Layout using Autogeneration 1.Create schematic using Lumped Components with artwork 2.Add connecting traces (e.g. microstrip lines) 3.Generate layout from schematic 4.Modify layout to suit Abbreviated procedure outlined next, but more detail in document posted on web Slide 6

1. Open ADS Under Start menu in Windows, ads in UNIX File Create New Project Slide 7

2. Add passives Use Lumped-With Artwork palette Slide 8

3. Set size of passives Each R,L,C item has properties of W, S, L that specify pad size use data sheet to determine pads Slide 9

4. Add active components Come in standard package sizes: see Wikipedia Surface mount technology Transistor: select BJT or MOSFET palette, place on schematic, right click, Component Edit Artwork, and select package size IC: select a component with the right number of pins (e.g. in Eqn-based Nonlinear palette), select artwork Slide 10

5. Join everything with microstrip Slide 11

Slide 12

6. Export to layout Layout Generate/Update Layout Slide 13

7. Modify layout elements May need to move/rotate microstrip lines to prevent them from overlapping Can add new lines using Insert Rectangle See Chapter 9 of the Schematic Capture and Layout manual Slide 14

8. Export to Gerber file From layout window select File Export, then select Gerber Provide Gerber file to ILC technician Slide 15

More information Schematic Capture and Layout ADS manual Tutorial guide at http://bmf.ece.queensu.ca/ Slide 16

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