Compact Device Modeling Using Velilog-A and ADMS

18 Pages·2002·0.64 MB·English

Compact Device Modeling Using
Velilog-A and ADMS
Laurent Lemaitre, Colin Mc Andrew, Wladek Grabinski
[email protected]
Motorola, Geneva Modeling Center
207 route de Ferney
CH-1218 Le Grand Saconnex
MIXDES’2001
Motorola Document Classification, Rev 2002.06#1
Motorola, the Stylized M, and all other trademarks indicated as such herein are trademarks of Motorola, Inc. ® Reg. U.S. Pat. & Tm. Off.
All other product or service names are the property of their respective owners. © Motorola, Inc. 2001. All rights reserved.
Compact Device Modeling Using Velilog-A and ADMS
Outline:
Developments of the Compact Models
Device Model Implementation Today
ADMS - Device Model Generator
Overview of the Device Model Generator
Example of Model Generation
Implementation of EKV 2.6 in ADS
Current Status - Availability
Conclusion
MIXDES’2001
Motorola Document Classification, Rev 2002.06#2
Motorola, the Stylized M, and all other trademarks indicated as such herein are trademarks of Motorola, Inc. ® Reg. U.S. Pat. & Tm. Off.
All other product or service names are the property of their respective owners. © Motorola, Inc. 2001. All rights reserved.
Developments of the Compact Models
1000
BSIM4
BSIM3v2
BSIM3v3
s
r
e BSIM2 HiSIM
t HSP28
e
m 100
BSIM3v3
a
ar BSIM BSIM3v2
P MM11
BSIM2
el PCIM SP
d HSP28
o BSIM3v1 EKV3
M
LEVEL2 MM9
f BSIM
o
EKV v2.6

.
o 10
LEVEL3
N
LEVEL1
Including L,W,P scaling
Without scaling
1
1960 1970 1980 1990 2000 2010
Years
(cid:127) Number of DC model parameters vs. year of the model introduction
– Significant growth of the parameter number that includes geometry (W/L) scaling
– Most recent versions of the EKV, HiSIM, MM, PCIM and SP models are included
MIXDES’2001
Motorola Document Classification, Rev 2002.06#3
Motorola, the Stylized M, and all other trademarks indicated as such herein are trademarks of Motorola, Inc. ® Reg. U.S. Pat. & Tm. Off.
All other product or service names are the property of their respective owners. © Motorola, Inc. 2001. All rights reserved.
What is a Device Model?
PROGRAMMER:
Spice netlists
Electrical
+
Circuit
Process libraries
Simulator
(model parameters)
DESIGNER:
Spectre, ADS, Mica ...
Model c-code
Simulation
Results
ADMS
or Manually
DEVICE MODELING ENGINEER:
Built-in Device Model Equations
VBIC, EKV, SP, MOSCAP, R3, ..
MIXDES’2001
Motorola Document Classification, Rev 2002.06#4
Motorola, the Stylized M, and all other trademarks indicated as such herein are trademarks of Motorola, Inc. ® Reg. U.S. Pat. & Tm. Off.
All other product or service names are the property of their respective owners. © Motorola, Inc. 2001. All rights reserved.
Model Implementation Today
Device Modeling Engineer:
provides equations of new model
to programmer. No standard.
Programmer:
hand-codes the model in source code of the electrical circuit
simulator (most of the time the language is C). No standard.
(cid:127) C code must comply with the Simulator Programming Interface.
Much coding needs to be done again for each simulator.
(cid:127) C code involves the manual computation and coding of partial derivatives.
This process is tedious and error-prone.
(cid:127) Feedback to the Device Modeling Engineer is made difficult.
C-code is hard to read.
(cid:127) The process is a barrier to model maintenance and enhancement.
MIXDES’2001
Motorola Document Classification, Rev 2002.06#5
Motorola, the Stylized M, and all other trademarks indicated as such herein are trademarks of Motorola, Inc. ® Reg. U.S. Pat. & Tm. Off.
All other product or service names are the property of their respective owners. © Motorola, Inc. 2001. All rights reserved.
ADMS Approach
(cid:127) ADMS is a Code Generator from a high-level language to ready-to-
compile C code for simulators
(cid:127) ADMS uses Verilog-AMS as a description language for device
models. Verilog-AMS is a behavioral description language for mixed-
signal electrical circuits.
(cid:127) Verilog-AMS code easy to read - no extra code specific to simulators.
(cid:127) Model can be easily and completely tested prior implementation!
(cid:127) ADMS uses a subset of XML as an intermediate language between
Verilog-AMS and Simulator Programming Interfaces.
(cid:127) Simplifies development of new features of ADMS and support of multiple
simulators
MIXDES’2001
Motorola Document Classification, Rev 2002.06#6
Motorola, the Stylized M, and all other trademarks indicated as such herein are trademarks of Motorola, Inc. ® Reg. U.S. Pat. & Tm. Off.
All other product or service names are the property of their respective owners. © Motorola, Inc. 2001. All rights reserved.
ADMS Model Generator
STANDARD 1: STANDARD 2:
MODEL LEVEL SIMULATOR LEVEL
DTD based
Parsing XML validation
Internal
data
Verilog-AMS
Model Code
Code Generator Other applications
Testing
C code
Documentation,
prior implementation
Mica, Spectre,
Circuit Test Benches
Hsim, ADS, …
MIXDES’2001
Motorola Document Classification, Rev 2002.06#7
Motorola, the Stylized M, and all other trademarks indicated as such herein are trademarks of Motorola, Inc. ® Reg. U.S. Pat. & Tm. Off.
All other product or service names are the property of their respective owners. © Motorola, Inc. 2001. All rights reserved.
Example – Symbolic View
Bipolar Device Model
Collector
Base
Emitter
(cid:127) Branch assignment in the HBT model
MIXDES’2001
Motorola Document Classification, Rev 2002.06#8
Motorola, the Stylized M, and all other trademarks indicated as such herein are trademarks of Motorola, Inc. ® Reg. U.S. Pat. & Tm. Off.
All other product or service names are the property of their respective owners. © Motorola, Inc. 2001. All rights reserved.
Example – Verilog-AMS
‘define NPN +1
‘define PNP –1
module BIP (c,b,e);
// Nodes
input c,b; // input nodes
output e;// output nodes
electrical c,b,e; // all electrical
// Branches
branch (b,c) bc;
branch (c,e) ce;
branch (e,c) ec;
branch (b,e) be;
MIXDES’2001
Motorola Document Classification, Rev 2002.06#9
Motorola, the Stylized M, and all other trademarks indicated as such herein are trademarks of Motorola, Inc. ® Reg. U.S. Pat. & Tm. Off.
All other product or service names are the property of their respective owners. © Motorola, Inc. 2001. All rights reserved.
Example – Verilog-AMS (cont.)
// Parameters
parameter real is = 1.0e-16;
parameter real bf = 100;
parameter real br = 1;
parameter real nf = 1.0;
parameter real nr = 1.0;
parameter integer type = ‘NPN;
// Variables
real Tdev, Vtv;
real Ifi, Ibf;
real Iri, Ibr;
real argf,expf;
MIXDES’2001
Motorola Document Classification, Rev 2002.06#10
Motorola, the Stylized M, and all other trademarks indicated as such herein are trademarks of Motorola, Inc. ® Reg. U.S. Pat. & Tm. Off.
All other product or service names are the property of their respective owners. © Motorola, Inc. 2001. All rights reserved.