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#1
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DISCRETE NMOS & PMOS, Low V, Low I
Not being a discrete MOS user, I am unfamiliar with what is currently
available. I need NMOS and PMOS, VDS = 5V, ID =500uA (And truly small... need capacitance as low as possible.) Operating frequency = 100KHz Suggestions? Thanks! ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice480)460-2350 | | | E-mail Address at Website Fax480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | America: Land of the Free, Because of the Brave |
#2
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DISCRETE NMOS & PMOS, Low V, Low I
On Fri, 11 Jan 2008 16:52:15 -0700, Jim Thompson wrote:
Not being a discrete MOS user, I am unfamiliar with what is currently available. I need NMOS and PMOS, VDS = 5V, ID =500uA (And truly small... need capacitance as low as possible.) Operating frequency = 100KHz Suggestions? Thanks! ...Jim Thompson www.google.com same as the rest of us. Jim |
#3
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DISCRETE NMOS & PMOS, Low V, Low I
On Sat, 12 Jan 2008 09:04:37 GMT, JimW52 wrote:
On Fri, 11 Jan 2008 16:52:15 -0700, Jim Thompson wrote: Not being a discrete MOS user, I am unfamiliar with what is currently available. I need NMOS and PMOS, VDS = 5V, ID =500uA (And truly small... need capacitance as low as possible.) Operating frequency = 100KHz Suggestions? Thanks! ...Jim Thompson www.google.com same as the rest of us. Jim So you have no experience with such small device either? You were SO helpful. ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice480)460-2350 | | | E-mail Address at Website Fax480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | America: Land of the Free, Because of the Brave |
#4
Posted to alt.binaries.schematics.electronic,sci.electronics.design
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DISCRETE NMOS & PMOS, Low V, Low I
On Fri, 11 Jan 2008 16:52:15 -0700, Jim Thompson
wrote: Not being a discrete MOS user, I am unfamiliar with what is currently available. I need NMOS and PMOS, VDS = 5V, ID =500uA (And truly small... need capacitance as low as possible.) Operating frequency = 100KHz Suggestions? Thanks! ...Jim Thompson CD4007? John |
#5
Posted to alt.binaries.schematics.electronic,sci.electronics.design
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DISCRETE NMOS & PMOS, Low V, Low I
On Fri, 11 Jan 2008 16:52:15 -0700, Jim Thompson
wrote: Not being a discrete MOS user, I am unfamiliar with what is currently available. I need NMOS and PMOS, VDS = 5V, ID =500uA (And truly small... need capacitance as low as possible.) Operating frequency = 100KHz Suggestions? Thanks! ...Jim Thompson Or these: http://www.calogic.net/html/mosfet.html John |
#6
Posted to alt.binaries.schematics.electronic,sci.electronics.design
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DISCRETE NMOS & PMOS, Low V, Low I
Jim Thompson wrote:
Not being a discrete MOS user, I am unfamiliar with what is currently available. I need NMOS and PMOS, VDS = 5V, ID =500uA (And truly small... need capacitance as low as possible.) Operating frequency = 100KHz Suggestions? Thanks! Have you asked your favorite foundries? Some will bond out sample devices for you, to kick the tires or to lash up something. For really good customers they might even be free. Usually they won't offer fancy packages such as SC75 but more likely SO-something and you can't be too picky about geometry. -- Regards, Joerg http://www.analogconsultants.com/ |
#7
Posted to alt.binaries.schematics.electronic,sci.electronics.design
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DISCRETE NMOS & PMOS, Low V, Low I
"Jim Thompson" wrote in
message ... Not being a discrete MOS user, I am unfamiliar with what is currently available. I need NMOS and PMOS, VDS = 5V, ID =500uA (And truly small... need capacitance as low as possible.) Operating frequency = 100KHz Suggestions? Thanks! I actually started digging into my old archives, as I had researched this about 10 years ago at Hewlett Packard. The old silicon printheads used a FET array to fire the TIJ (thermal inkjet) resistors, which had very low Ciss and I had to find substitutes for a test instrument we designed which could simulate the printhead. After pulling up the old datasheet, it became apparent how far we've come. The ZVN4206A which we used (after much searching) boasted 100pf Ciss which was quite the kickass part at the time. A quick search for "Ciss" on Digikey get's lots of options for you. They're down as low as 1.5pf now, Yikes! http://www.digikey.com/scripts/DkSea...;keywords=ciss Happy Hunting! Chris |
#8
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DISCRETE NMOS & PMOS, Low V, Low I
On 2008-01-12 07:50, Jim Thompson wrote:
On Sat, 12 Jan 2008 09:04:37 GMT, JimW52 wrote: On Fri, 11 Jan 2008 16:52:15 -0700, Jim Thompson wrote: Not being a discrete MOS user, I am unfamiliar with what is currently available. I need NMOS and PMOS, VDS = 5V, ID =500uA (And truly small... need capacitance as low as possible.) Operating frequency = 100KHz Suggestions? Thanks! ...Jim Thompson www.google.com same as the rest of us. Jim So you have no experience with such small device either? You were SO helpful. ...Jim Thompson Oh, you mean he should be helpful like you? All YOU ever do in this group is smother it in off-topic posts and then ask others to do your work for you, for free, while charging your clients for it. You should look in the mirror before talking about others. -- Pay no attention to that man behind the curtain... |
#9
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DISCRETE NMOS & PMOS, Low V, Low I
On Mon, 14 Jan 2008 06:06:03 GMT, Wizard of Odds
wrote: On 2008-01-12 07:50, Jim Thompson wrote: On Sat, 12 Jan 2008 09:04:37 GMT, JimW52 wrote: On Fri, 11 Jan 2008 16:52:15 -0700, Jim Thompson wrote: Not being a discrete MOS user, I am unfamiliar with what is currently available. I need NMOS and PMOS, VDS = 5V, ID =500uA (And truly small... need capacitance as low as possible.) Operating frequency = 100KHz Suggestions? Thanks! ...Jim Thompson www.google.com same as the rest of us. Jim So you have no experience with such small device either? You were SO helpful. ...Jim Thompson Oh, you mean he should be helpful like you? All YOU ever do in this group is smother it in off-topic posts and then ask others to do your work for you, for free, while charging your clients for it. Bwahahahaha! It is rare indeed when ANYTHING useful is ever posted here. You should look in the mirror before talking about others. Some experts users in the area I was unfamiliar with have responded usefully. ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice480)460-2350 | | | E-mail Address at Website Fax480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | America: Land of the Free, Because of the Brave |
#10
Posted to alt.binaries.schematics.electronic,sci.electronics.design
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DISCRETE NMOS & PMOS, Low V, Low I
Jim Thompson wrote:
Not being a discrete MOS user, I am unfamiliar with what is currently available. I need NMOS and PMOS, VDS = 5V, ID =500uA (And truly small... need capacitance as low as possible.) Operating frequency = 100KHz Suggestions? Thanks! So, what did you finally buy? Inquiring minds want to know ... :-) And no, this time we won't ask what circuit you built. -- Regards, Joerg http://www.analogconsultants.com/ |
#11
Posted to alt.binaries.schematics.electronic,sci.electronics.design
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DISCRETE NMOS & PMOS, Low V, Low I
On Mon, 14 Jan 2008 16:34:43 -0800, Joerg
wrote: Jim Thompson wrote: Not being a discrete MOS user, I am unfamiliar with what is currently available. I need NMOS and PMOS, VDS = 5V, ID =500uA (And truly small... need capacitance as low as possible.) Operating frequency = 100KHz Suggestions? Thanks! So, what did you finally buy? Inquiring minds want to know ... :-) And no, this time we won't ask what circuit you built. I'm on hold while I await further experiments by the client, but it certainly looks promising to use small MOS devices to cascode large photodiodes into TIA's. ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice480)460-2350 | | | E-mail Address at Website Fax480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | America: Land of the Free, Because of the Brave |
#12
Posted to alt.binaries.schematics.electronic,sci.electronics.design
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DISCRETE NMOS & PMOS, Low V, Low I
Jim Thompson wrote:
On Mon, 14 Jan 2008 16:34:43 -0800, Joerg wrote: Jim Thompson wrote: Not being a discrete MOS user, I am unfamiliar with what is currently available. I need NMOS and PMOS, VDS = 5V, ID =500uA (And truly small... need capacitance as low as possible.) Operating frequency = 100KHz Suggestions? Thanks! So, what did you finally buy? Inquiring minds want to know ... :-) And no, this time we won't ask what circuit you built. I'm on hold while I await further experiments by the client, but it certainly looks promising to use small MOS devices to cascode large photodiodes into TIA's. So far I've only once cascoded with a FET and back then it was ye olde 2N7002/BSS123 (but still followed with a BJT). Later only bipolar. Then the fiberoptics part of my biz life became easier, lots of speed but really low-C photodiodes. I am sure you've read Phil Hoobs' paper but in case other haven't seen it yet: http://users.bestweb.net/~hobbs/frontends/frontends.pdf For low-C work the newer dual-gate FETs are nice but I believe your stuff is low frequency and I don't know how they behave down there noise-wise. This would be the BF998 (they really messed up their links now): http://www.infineon.com/dgdl/bf998se...1493688fd31042 -- Regards, Joerg http://www.analogconsultants.com/ |
#13
Posted to alt.binaries.schematics.electronic,sci.electronics.design
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DISCRETE NMOS & PMOS, Low V, Low I
On Tue, 15 Jan 2008 01:26:32 GMT, Joerg
wrote: Jim Thompson wrote: On Mon, 14 Jan 2008 16:34:43 -0800, Joerg wrote: Jim Thompson wrote: Not being a discrete MOS user, I am unfamiliar with what is currently available. I need NMOS and PMOS, VDS = 5V, ID =500uA (And truly small... need capacitance as low as possible.) Operating frequency = 100KHz Suggestions? Thanks! So, what did you finally buy? Inquiring minds want to know ... :-) And no, this time we won't ask what circuit you built. I'm on hold while I await further experiments by the client, but it certainly looks promising to use small MOS devices to cascode large photodiodes into TIA's. So far I've only once cascoded with a FET and back then it was ye olde 2N7002/BSS123 (but still followed with a BJT). Later only bipolar. Then the fiberoptics part of my biz life became easier, lots of speed but really low-C photodiodes. I am sure you've read Phil Hoobs' paper but in case other haven't seen it yet: http://users.bestweb.net/~hobbs/frontends/frontends.pdf For low-C work the newer dual-gate FETs are nice but I believe your stuff is low frequency and I don't know how they behave down there noise-wise. This would be the BF998 (they really messed up their links now): http://www.infineon.com/dgdl/bf998se...1493688fd31042 Phil and I loosely keep in touch... he even knows who I'm working with right now ;-) ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice480)460-2350 | | | E-mail Address at Website Fax480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | America: Land of the Free, Because of the Brave |
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