Photodiode SPICE models?
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From: Phil Hobbs on 27 Oct 2009 17:09 Dear all: I'm on a bit of a roll with TIA designs at the moment, but I've just been using current sources with caps in parallel to model fully-depleted photodiodes, and I need a better model to hack up. The LTSPICE Yahoo group's files area is broken at the moment. Do any of you have a decent PD model with 4 terminals (anode, cathode, and two to represent the light input)? Nonlinear capacitance would be a plus but isn't required. (I've used SPICE more in the last two weeks than in my entire previous career--I'm more of an algebra guy when it comes to circuit design, but some things really need sims.) Thanks Phil Hobbs -- Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
From: Joerg on 27 Oct 2009 18:32 Phil Hobbs wrote: > Dear all: > > I'm on a bit of a roll with TIA designs at the moment, but I've just > been using current sources with caps in parallel to model fully-depleted > photodiodes, and I need a better model to hack up. > > The LTSPICE Yahoo group's files area is broken at the moment. Do any of > you have a decent PD model with 4 terminals (anode, cathode, and two to > represent the light input)? > > Nonlinear capacitance would be a plus but isn't required. > > (I've used SPICE more in the last two weeks than in my entire previous > career--I'm more of an algebra guy when it comes to circuit design, but > some things really need sims.) > Been there myself but ran out of time and did the design sans sims ... rummaging in some old notes ... ah, here, in case you have library access: Ravezzi L.; Dalla Betta G.-F.1; Stoppa D.; Simoni A., Microelectronics Journal, Vol.31, No.4, April 2000, pp. 277-282, Elsevier. Sorry, I wish I had it but I don't. But these are available online: http://www.mos-ak.org/munich/posters/P09_MOS-AK_Senapati.pdf http://www.nsti.org/publications/MSM/2001/pdf/302.pdf Ecole Polytechnique in France has developed a model a couple years ago, you might want to contact: razvan.negru <at> polytechnique <dot> edu Specialty stuff but may be helpful: http://www.mdpi.com/1424-8220/8/10/6566/pdf -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Phil Hobbs on 27 Oct 2009 18:33 Joerg wrote: > Phil Hobbs wrote: >> Dear all: >> >> I'm on a bit of a roll with TIA designs at the moment, but I've just >> been using current sources with caps in parallel to model >> fully-depleted photodiodes, and I need a better model to hack up. >> >> The LTSPICE Yahoo group's files area is broken at the moment. Do any >> of you have a decent PD model with 4 terminals (anode, cathode, and >> two to represent the light input)? >> >> Nonlinear capacitance would be a plus but isn't required. >> >> (I've used SPICE more in the last two weeks than in my entire previous >> career--I'm more of an algebra guy when it comes to circuit design, >> but some things really need sims.) >> > > Been there myself but ran out of time and did the design sans sims ... > rummaging in some old notes ... ah, here, in case you have library access: > > Ravezzi L.; Dalla Betta G.-F.1; Stoppa D.; Simoni A., Microelectronics > Journal, Vol.31, No.4, April 2000, pp. 277-282, Elsevier. > > Sorry, I wish I had it but I don't. But these are available online: > > http://www.mos-ak.org/munich/posters/P09_MOS-AK_Senapati.pdf > http://www.nsti.org/publications/MSM/2001/pdf/302.pdf > > Ecole Polytechnique in France has developed a model a couple years ago, > you might want to contact: > razvan.negru <at> polytechnique <dot> edu > > Specialty stuff but may be helpful: > > http://www.mdpi.com/1424-8220/8/10/6566/pdf > Thanks, Joerg. I'll do that. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
From: Yuri Belenky on 28 Oct 2009 02:38 Phil Hobbs wrote: > Dear all: > > I'm on a bit of a roll with TIA designs at the moment, but I've just > been using current sources with caps in parallel to model fully-depleted > photodiodes, and I need a better model to hack up. > > The LTSPICE Yahoo group's files area is broken at the moment. Do any of > you have a decent PD model with 4 terminals (anode, cathode, and two to > represent the light input)? > > Nonlinear capacitance would be a plus but isn't required. > > (I've used SPICE more in the last two weeks than in my entire previous > career--I'm more of an algebra guy when it comes to circuit design, but > some things really need sims.) > > Thanks > > Phil Hobbs > I've used this model several years ago (MRD500 photodiode): --- model starts here ------------------------ * PSpice Model Editor - Version 10.5.0 *$ ******************************************************************************* * A = Anode * C = Cathode * P = (light)Power as voltage input ..SUBCKT MRD500 A C P PARAMS: Spec=1.0 Sensy=0.3894 * MRD500 from Motorola * RAP 7/97 DPD A C PhotoDet RDUMMY P 0 1G GPD C A TABLE {V(P)* Spec * Sensy} (0,0) (1,1) ..MODEL PhotoDet D IS=1.02p RS=10 N=0.841978 BV=100 IBV=1u + CJO=6.03p VJ=0.202968 M=0.146605 TT=1n ISR=17p ..ends *$ --- end of model ------------------------------ Let me know if you need it as OrCAD library file. Yuri.
From: Phil Hobbs on 28 Oct 2009 12:40
Yuri Belenky wrote: > Phil Hobbs wrote: >> Dear all: >> >> I'm on a bit of a roll with TIA designs at the moment, but I've just >> been using current sources with caps in parallel to model >> fully-depleted photodiodes, and I need a better model to hack up. >> >> The LTSPICE Yahoo group's files area is broken at the moment. Do any >> of you have a decent PD model with 4 terminals (anode, cathode, and >> two to represent the light input)? >> >> Nonlinear capacitance would be a plus but isn't required. >> >> (I've used SPICE more in the last two weeks than in my entire previous >> career--I'm more of an algebra guy when it comes to circuit design, >> but some things really need sims.) >> >> Thanks >> >> Phil Hobbs >> > > I've used this model several years ago (MRD500 photodiode): > > --- model starts here ------------------------ > > * PSpice Model Editor - Version 10.5.0 > > *$ > ******************************************************************************* > > * A = Anode > * C = Cathode > * P = (light)Power as voltage input > ..SUBCKT MRD500 A C P PARAMS: Spec=1.0 Sensy=0.3894 > * MRD500 from Motorola * RAP 7/97 > DPD A C PhotoDet > RDUMMY P 0 1G > GPD C A TABLE {V(P)* Spec * Sensy} (0,0) (1,1) > ..MODEL PhotoDet D IS=1.02p RS=10 N=0.841978 BV=100 IBV=1u > + CJO=6.03p VJ=0.202968 M=0.146605 TT=1n ISR=17p > ..ends > *$ > > --- end of model ------------------------------ > > Let me know if you need it as OrCAD library file. > > Yuri. Thanks. A couple of people have sent models (Thanks, guys), but there is one remaining puzzle: shot noise. I'd have thought that the .asc file below would generate exactly the shot noise of Iphoto--diodes have full shot noise, so connecting it to a DC current source should turn D1 into a full shot noise current source, which ought to get picked off via the infinite capacitor into the 0V source, and so into the behavioural current source at the output. However, it doesn't do anything of the sort--it's all over the map. Different diodes and diode-connected transistors give all sorts of different values. Any ideas what's going on? One possible clue is that any resistance at all in series with V2 reduces the noise enormously. Thanks Phil Hobbs -- Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net |