Name of screening technique
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From: MarkAren on 15 Mar 2010 05:24 Hi All, I have been scratching my head for a while and just can't remember the correct term... What is the name of the technique where a very high sensitivity input is protected by a metal screen... The rub is that the screening can is actively driven with buffered ground reference I keep coming up with "force driven screening" or something similar Thoughts please Thanks, Mark
From: Grant on 15 Mar 2010 06:22 On Mon, 15 Mar 2010 02:24:52 -0700 (PDT), MarkAren <markaren10(a)yahoo.com> wrote: >Hi All, > >I have been scratching my head for a while and just can't remember the >correct term... > >What is the name of the technique where a very high sensitivity input >is protected by a metal screen... Like Figure 9, page 14 of TI's INA321 Datasheet? Shown is an ECG amplifier circuit application. Grant.
From: keithw86 on 15 Mar 2010 08:42 On Mar 15, 4:24 am, MarkAren <markare...(a)yahoo.com> wrote: > Hi All, > > I have been scratching my head for a while and just can't remember the > correct term... > > What is the name of the technique where a very high sensitivity input > is protected by a metal screen... Are you looking for "guarding"? I've generally use this term for traces on boards used for this purpose. Leakage currents go to the "guard" trace rather than the circuit. > The rub is that the screening can is actively driven with buffered > ground reference "Active guarding". > I keep coming up with "force driven screening" or something similar > > Thoughts please > > Thanks, > > Mark
From: MarkAren on 15 Mar 2010 13:51 On Mar 16, 1:42 am, "keith...(a)gmail.com" <keith...(a)gmail.com> wrote: > On Mar 15, 4:24 am, MarkAren <markare...(a)yahoo.com> wrote: > > > Hi All, > > > I have been scratching my head for a while and just can't remember the > > correct term... > > > What is the name of the technique where a very high sensitivity input > > is protected by a metal screen... > > Are you looking for "guarding"? I've generally use this term for > traces on boards used for this purpose. Leakage currents go to the > "guard" trace rather than the circuit. > > > The rub is that the screening can is actively driven with buffered > > ground reference > > "Active guarding". > > > > > I keep coming up with "force driven screening" or something similar > > > Thoughts please > > > Thanks, > > > Mark Thanks guys. "guarding", "active guarding" and "ring guarding" was what I was looking for. -Mark
From: krw on 15 Mar 2010 20:24
On Mon, 15 Mar 2010 10:51:47 -0700 (PDT), MarkAren <markaren10(a)yahoo.com> wrote: >On Mar 16, 1:42�am, "keith...(a)gmail.com" <keith...(a)gmail.com> wrote: >> On Mar 15, 4:24�am, MarkAren <markare...(a)yahoo.com> wrote: >> >> > Hi All, >> >> > I have been scratching my head for a while and just can't remember the >> > correct term... >> >> > What is the name of the technique where a very high sensitivity input >> > is protected by a metal screen... >> >> Are you looking for "guarding"? �I've generally use this term for >> traces on boards used for this purpose. �Leakage currents go to the >> "guard" trace rather than the circuit. >> >> > The rub is that the screening can is actively driven with buffered >> > ground reference >> >> "Active guarding". >> >> >> >> > I keep coming up with "force driven screening" or something similar >> >> > Thoughts please >> >> > Thanks, >> >> > Mark > >Thanks guys. > >"guarding", "active guarding" and "ring guarding" was what I was >looking for. Yes, I've also seen "driven guard". Note that the guard usually isn't driven at ground, but rather the common mode voltage. |