Could some electronics guru please help ? I am looking for a very low(few milliVolts) VTO commercially available NMOS, and its corresponding PMOS. I am trying to use a reverse biased photodiode(very low output current) to trigger a PMOS. The output voltage could then be used to trigger ideally a BJT. Any hints, suggestiosn would be greatly appreciated. Thanks in advance.
Looking for very low threshold voltage NMOS and its PMOS counterpart
Started by ●September 20, 2023
Reply by ●September 20, 20232023-09-20
On Wed, 20 Sep 2023 08:08:08 -0700 (PDT), amal banerjee <dakupoto@gmail.com> wrote:>Could some electronics guru please help ? I am looking for a very low(few milliVolts) VTO commercially available NMOS, and its corresponding PMOS. >I am trying to use a reverse biased photodiode(very low output current) to >trigger a PMOS. The output voltage could then be used to trigger ideally a >BJT. Any hints, suggestiosn would be greatly appreciated. Thanks in advance.What is VTO? I don't think such a part exists. A photodiode might just barely turn on a high-beta bipolar transisor. What's the open-circuit voltage of the photodiode? What's the current? Is a power supply available? If the pd is back-biased by a supply, you'd have lots of voltage available to turn on a mosfet. A lithium battery might power a micropower comparator for decades.
Reply by ●September 20, 20232023-09-20
On Wednesday, September 20, 2023 at 10:21:50 AM UTC-5, John Larkin wrote:> On Wed, 20 Sep 2023 08:08:08 -0700 (PDT), amal banerjee > <daku...@gmail.com> wrote: > > >Could some electronics guru please help ? I am looking for a very low(few milliVolts) VTO commercially available NMOS, and its corresponding PMOS. > >I am trying to use a reverse biased photodiode(very low output current) to > >trigger a PMOS. The output voltage could then be used to trigger ideally a > >BJT. Any hints, suggestiosn would be greatly appreciated. Thanks in advance. > What is VTO? > > I don't think such a part exists. A photodiode might just barely turn > on a high-beta bipolar transisor. > > What's the open-circuit voltage of the photodiode? What's the current? > Is a power supply available? If the pd is back-biased by a supply, > you'd have lots of voltage available to turn on a mosfet. > > A lithium battery might power a micropower comparator for decades.VTO: Vertical Take Off
Reply by ●September 20, 20232023-09-20
On 20/09/2023 16:21, John Larkin wrote:> On Wed, 20 Sep 2023 08:08:08 -0700 (PDT), amal banerjee > <dakupoto@gmail.com> wrote: > >> Could some electronics guru please help ? I am looking for a very low(few milliVolts) VTO commercially available NMOS, and its corresponding PMOS. >> I am trying to use a reverse biased photodiode(very low output current) to >> trigger a PMOS. The output voltage could then be used to trigger ideally a >> BJT. Any hints, suggestiosn would be greatly appreciated. Thanks in advance. > > What is VTO? > > I don't think such a part exists. A photodiode might just barely turn > on a high-beta bipolar transisor. > > What's the open-circuit voltage of the photodiode? What's the current? > Is a power supply available? If the pd is back-biased by a supply, > you'd have lots of voltage available to turn on a mosfet. > > A lithium battery might power a micropower comparator for decades. >I think they meant V-turn-on? Strange sub threshold behaviors exist but I know nothing about them. piglet
Reply by ●September 20, 20232023-09-20
On 2023-09-20 17:08, amal banerjee wrote:> Could some electronics guru please help ? I am looking for a very low(few milliVolts) VTO commercially available NMOS, and its corresponding PMOS. > I am trying to use a reverse biased photodiode(very low output current) to > trigger a PMOS. The output voltage could then be used to trigger ideally a > BJT. Any hints, suggestiosn would be greatly appreciated. Thanks in advance. >That's what amplifiers are for. Jeroen Belleman
Reply by ●September 20, 20232023-09-20
On Wednesday, 20 September 2023 at 18:10:44 UTC+1, John Smiht wrote:> On Wednesday, September 20, 2023 at 10:21:50 AM UTC-5, John Larkin wrote: > > On Wed, 20 Sep 2023 08:08:08 -0700 (PDT), amal banerjee > > <daku...@gmail.com> wrote: > > > > >Could some electronics guru please help ? I am looking for a very low(few milliVolts) VTO commercially available NMOS, and its corresponding PMOS. > > >I am trying to use a reverse biased photodiode(very low output current) to > > >trigger a PMOS. The output voltage could then be used to trigger ideally a > > >BJT. Any hints, suggestiosn would be greatly appreciated. Thanks in advance. > > What is VTO? > > > > I don't think such a part exists. A photodiode might just barely turn > > on a high-beta bipolar transisor. > > > > What's the open-circuit voltage of the photodiode? What's the current? > > Is a power supply available? If the pd is back-biased by a supply, > > you'd have lots of voltage available to turn on a mosfet. > > > > A lithium battery might power a micropower comparator for decades. > VTO: Vertical Take OffI've seen transistors do that. Just apply 100x rated power
Reply by ●September 20, 20232023-09-20
On Wednesday, September 20, 2023 at 7:57:41 PM UTC-5, Tabby wrote:> On Wednesday, 20 September 2023 at 18:10:44 UTC+1, John Smiht wrote: > > On Wednesday, September 20, 2023 at 10:21:50 AM UTC-5, John Larkin wrote: > > > On Wed, 20 Sep 2023 08:08:08 -0700 (PDT), amal banerjee > > > <daku...@gmail.com> wrote: > > > > > > >Could some electronics guru please help ? I am looking for a very low(few milliVolts) VTO commercially available NMOS, and its corresponding PMOS. > > > >I am trying to use a reverse biased photodiode(very low output current) to > > > >trigger a PMOS. The output voltage could then be used to trigger ideally a > > > >BJT. Any hints, suggestiosn would be greatly appreciated. Thanks in advance. > > > What is VTO? > > > > > > I don't think such a part exists. A photodiode might just barely turn > > > on a high-beta bipolar transisor. > > > > > > What's the open-circuit voltage of the photodiode? What's the current? > > > Is a power supply available? If the pd is back-biased by a supply, > > > you'd have lots of voltage available to turn on a mosfet. > > > > > > A lithium battery might power a micropower comparator for decades. > > VTO: Vertical Take Off > I've seen transistors do that. Just apply 100x rated powerA TO92 is what I think of as a transistor-on-the-half-shell.
Reply by ●September 20, 20232023-09-20
On Wednesday, September 20, 2023 at 12:37:46 PM UTC-5, piglet wrote:> On 20/09/2023 16:21, John Larkin wrote: > > On Wed, 20 Sep 2023 08:08:08 -0700 (PDT), amal banerjee > > <daku...@gmail.com> wrote: > > > >> Could some electronics guru please help ? I am looking for a very low(few milliVolts) VTO commercially available NMOS, and its corresponding PMOS. > >> I am trying to use a reverse biased photodiode(very low output current) to > >> trigger a PMOS. The output voltage could then be used to trigger ideally a > >> BJT. Any hints, suggestiosn would be greatly appreciated. Thanks in advance. > > > > What is VTO? > > > > I don't think such a part exists. A photodiode might just barely turn > > on a high-beta bipolar transisor. > > > > What's the open-circuit voltage of the photodiode? What's the current? > > Is a power supply available? If the pd is back-biased by a supply, > > you'd have lots of voltage available to turn on a mosfet. > > > > A lithium battery might power a micropower comparator for decades. > > > I think they meant V-turn-on? > > Strange sub threshold behaviors exist but I know nothing about them. > > pigletOr maybe V-turn-off?
Reply by ●September 21, 20232023-09-21
On Wednesday, September 20, 2023 at 8:51:50 PM UTC+5:30, John Larkin wrote:> On Wed, 20 Sep 2023 08:08:08 -0700 (PDT), amal banerjee > <daku...@gmail.com> wrote: > > >Could some electronics guru please help ? I am looking for a very low(few milliVolts) VTO commercially available NMOS, and its corresponding PMOS. > >I am trying to use a reverse biased photodiode(very low output current) to > >trigger a PMOS. The output voltage could then be used to trigger ideally a > >BJT. Any hints, suggestiosn would be greatly appreciated. Thanks in advance. > What is VTO? > > I don't think such a part exists. A photodiode might just barely turn > on a high-beta bipolar transisor. > > What's the open-circuit voltage of the photodiode? What's the current? > Is a power supply available? If the pd is back-biased by a supply, > you'd have lots of voltage available to turn on a mosfet. > > A lithium battery might power a micropower comparator for decades.Sorry for the confusion. 'VTO' means threshold voltage for the mosfet. The candidate photodiode is BPW31|34. The datasheet contains the following data: Open circuit voltage : 440 mV In reverse bias, the diode is open circuit, so current should flow. The dark current is 12 pA.
Reply by ●September 21, 20232023-09-21
On a sunny day (Wed, 20 Sep 2023 21:28:49 -0700 (PDT)) it happened amal banerjee <dakupoto@gmail.com> wrote in <21592d6c-93a9-4852-a6d9-285c75bbd202n@googlegroups.com>:>On Wednesday, September 20, 2023 at 8:51:50 PM UTC+5:30, John Larki= >n wrote: >> On Wed, 20 Sep 2023 08:08:08 -0700 (PDT), amal banerjee >> <daku...@gmail.com> wrote: >> >> >Could some electronics guru please help ? I am looking for a very low(fe= >w milliVolts) VTO commercially available NMOS, and its corresponding PMOS.= > >> >I am trying to use a reverse biased photodiode(very low output current) = >to >> >trigger a PMOS. The output voltage could then be used to trigger ideally= > a >> >BJT. Any hints, suggestiosn would be greatly appreciated. Thanks in adva= >nce. >> What is VTO? >> >> I don't think such a part exists. A photodiode might just barely turn >> on a high-beta bipolar transisor. >> >> What's the open-circuit voltage of the photodiode? What's the current? >> Is a power supply available? If the pd is back-biased by a supply, >> you'd have lots of voltage available to turn on a mosfet. >> >> A lithium battery might power a micropower comparator for decades. > >Sorry for the confusion. 'VTO' means threshold voltage for the mosfet. >The candidate photodiode is BPW31|34. The datasheet contains the following= > >data: >Open circuit voltage : 440 mV >In reverse bias, the diode is open circuit, so current should flow. The da= >rk current >is 12 pA.Think 'current' the reverse photo-diode could drive the base of for exampe a NPN directly photo diode current amplified by beta * R1 is output. Note leakage etc.. ------------------------ + | | --- R1 a few k / \ | --- |------------ out, negative going on light input | c ---- b NPN beta 200 e | ----------------- GND
