Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

how to simulate photodiode in standard cmos tech.

Status
Not open for further replies.
X

xuexucheng

Full Member level 2
Joined
May 6, 2010
Messages
145
Helped
4
Reputation
8
Reaction score
4
Trophy points
1,298
Activity points
2,343
I want use cadence to design CMOS image sensor.
But how to simulate photodiode in standard cmos tech?
dose the PDK or CDK support photodiode ?
if not , how to do?
thank you
 

PDK for standard CMOS does not usually have a photodiode as the passivation process on standard CMOS is not optimal for light transmission but some processes do support a photodiode.
It is easy enough to simulate a photodiode with the equivalent circuit below

14_1292168751.jpg


where IP is the current induced by photons, Io,Vo is output current and voltage, C is junction capacitance, Rsh is shunt resistance and Rs the series resistance.
 
Thank you!
However, how to give the value of Rs etc.
 

That would require detailed knowledge of the process you are using. If it is just for a learning exercise, then you could get these values from the Spice model of a commercial discrete device.
 
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top