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Electronics Forum / CAD / July 2008Spice Model for PMT
Anyone have a Spice model for a photo-multiplier TUBE ?? ...Jim Thompson | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | America: Land of the Free, Because of the Brave >Anyone have a Spice model for a photo-multiplier TUBE ?? > > ...Jim Thompson www-boone.fnal.gov/publicpages/detector_tdr.ps.gz Page 82 has some simple models. Best regards, Spehro Pefhany  Signature"it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com >>Anyone have a Spice model for a photo-multiplier TUBE ?? >> [quoted text clipped - 6 lines] >Best regards, >Spehro Pefhany Thanks! ...Jim Thompson | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Liberalism is a persistent vegetative state > Anyone have a Spice model for a photo-multiplier TUBE ?? > > ...Jim Thompson Do you need all 14 pins modelled, or just the photon->anode current response? Even if it's just the anode current, PMTs vary greatly in transit time, transit time spread, afterpulses, and so on--you can get pulse widths of 500 ps to 50 ns from one primary photoelectron. Cheers, Phil Hobbs >> Anyone have a Spice model for a photo-multiplier TUBE ?? >> >> ...Jim Thompson > >Do you need all 14 pins modelled, or just the photon->anode current >response? Just photon->anode current >Even if it's just the anode current, PMTs vary greatly in transit time, >transit time spread, afterpulses, and so on--you can get pulse widths of [quoted text clipped - 3 lines] > >Phil Hobbs ...Jim Thompson | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Liberalism is a persistent vegetative state > Just photon->anode current Not a spice model, but perhaps, some data that will help you build one. A few years ago, I came up with a functional fit between total supply voltage and gain for an Hamamatsu R928 stage side view multiplier: http://sales.hamamatsu.com/assets/pdf/parts_R/R928.pdf The function I pulled out of my but and fit to the data sheet curve is: gain(a,b,v,N)=(a*(v/(N+1))^b)^N Where N=9 successive internal gain stages, a=0.185, b=0.755, and v = the total voltage applied across the voltage divider socket type E717-21, shown at the end of the above data sheet. Add propagation delay and capacitance and I think you are close, if this is the sort of PMT. SignatureRegards, John Popelish > > Just photon->anode current > [quoted text clipped - 14 lines] > Add propagation delay and capacitance and I think you are > close, if this is the sort of PMT. Don't try and pull too much current out of the tube though. There are at least eight different sources of photomultiplier non-linearity, starting with space charge in the photo-cathode to first dynode space. Space charge between the last two dynodes (which are usually on either side of the anode) and the anode usually limits the anode current to less than 100mA (unless you use fairly high voltages across the last few dynodes). There was a rather dire Spice simulation of a PMT in IEEE Trans. Electron Devices vol.36 (9) 2005-2010 (Sept 1989) and my comment on it was published in 1991."Comment on 'Computer aided simulation study of photomultiplier tubes'", IEEE Transactions on Electron Devices, ED-38 679-680 (1991). It lists a bunch of papers on photomultiplier non-linearity. The best of them - by Sauerbrey - is in Applied Optics, but in German. I've got a translation somewhere. -- Bill Sloman, Nijmegen >> > Just photon->anode current >> [quoted text clipped - 33 lines] >of them - by Sauerbrey - is in Applied Optics, but in German. I've got >a translation somewhere. Thanks, Bill! ...Jim Thompson | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Liberalism is a persistent vegetative state >> Just photon->anode current > [quoted text clipped - 15 lines] >Add propagation delay and capacitance and I think you are >close, if this is the sort of PMT. Thanks! ...Jim Thompson | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Liberalism is a persistent vegetative state On 7月18日, 上午8时58分, Jim Thompson <To-Email-Use-The-Envelope-I...@My-Web- Site.com> wrote: > Anyone have a Spice model for a photo-multiplier TUBE ?? > [quoted text clipped - 8 lines] > > America: Land of the Free, Because of the Brave |
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