Max, It would be helpful to know what type of op-amps and circuit you are dealing with. Neil D... At 03:39 PM 11/3/97 -0500, Max Harris wrote: > Can anyone out there help me with the subject of using guard rings > around op amp inputs to minimize leakage at the high impedance nodes? > I will be using an FR-4 PCB, multilayer, PTH technology. From what > I've read, it is suggested that the guard rings be placed on every > layer. This begs the question: "How do I then connect traces to the > node being guarded?". Also, any traces that do connect to the guarded > node and then run outside of the ring are now subject to the same > leakage that the original node was. > > Any help would be appreciated. > > Max.P.Harris > Hardware Design Engineer > Lockheed Martin Canada, Inc. > >############################################################## >TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c >############################################################## >To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: >To subscribe: SUBSCRIBE TECHNET <your full name> >To unsubscribe: SIGNOFF TECHNET >############################################################## >Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. >For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 >############################################################## > ____________________ / /\ / Neil Diamond / \ / [log in to unmask] / \ /___________________/------\ ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ##############################################################