Layout, PCB

L a y o u t

Power & Ground Distribution Ramdac Layout Analog & Digital Separation ADC Example

^{Related Pages}

`Layout`	`= Stability`	`= E M C`	`= Performance`
`Bypassing`	`= Shunting`	`= Diversion`	`= Stabilization`
`Decoupling`	`= Isolation`	`= Separation`
`Shielding`	`= Blocking`	`= Impeding`	`= Protection`
`ground plane`	`= Return`	`= Sinking`	`= Referencing`

Power & Ground

Analog/Digital Power & Ground Distribution

The Use of back-to-back Schottky diodes, between the analog and digital grounds, is to catch any excessive differential shifts in ground potential--steady-state or fast events. This can happen when the distances from the device to the power supply (where the two grounds are reconciled) is excessive. Depending on the X_Land Z_oof the traces, the system clock's rise and fall times; and the currents involved: the distance or trace lengths, do not have to be very long to cause mischief.

Layout Examples

bt498 Ramdac Layout

Analog & Digital Power and Ground _-- S ^{e p e r}_{a t i o n}

	Seperation: Analog & Digital Power and Ground
	Multiple Layers

ADC Example:
Separation of Analog/Digital Power & Ground

Analog Devices AD-9020 Flash Convertor

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