On Thu, 09 Aug 2007 08:25:22 -0700, Telstar Electronics
wrote:

|On Aug 9, 8:43 am, james wrote:
| besides a well designed PCB layout and proper care in design can quite
| often remove the need for shielding.
|
|When you have an amplifier with 60dB of gain... and high local RF
|fields... all the design and PCB layout work in the world will not
|help you from instabilities... without a shield!
|www.telstar-electronics.com
|---------------

If there is instabilities that often is the results of to much gain in
one stage. A m ore prudent design would be to spread the gain over
several stages to reduce instabilities of a single stage.

Also proper RF by passing and PCB layout can minimize stray pickup of
weak RF fields.

james