"Chapter 1 - The Op Amp's Place in the World" - HTL Wien 10

Summary
17-28
HALF
SUPPLY
GOOD
_
+
HALF
SUPPLY
OPEN
ZERO
Figure 17–21. Proper Termination of Unused Op Amp Sections
17.8 Summary
17.8.1 General
BETTER
_
+
ZERO
Keep the following points in mind when designing a PCB for analog circuitry:
17.8.2 Board Structure
17.8.3 Components
Think of the PCB as a component of the design.
Know and understand the types of noise the circuit will be subjected to.
Prototype the circuit.
Use a high-quality board material such as FR–4.
Multi-layer boards are as much as 20-dB better than double-sided boards.
Use separate, nonoverlapping ground and power planes.
Place power and ground planes to the interior of the board instead of exterior.
Be aware of frequency limitations of traces and other passive components.
Avoid vertical mounting of through-hole passive components in high-speed circuits.
Use surface mount for high-speed analog circuitry.
Keep traces as short as possible.
Use narrow traces if long traces are required.
Terminate unused op amp sections properly.