Sistemi Elettronici Integrati B 25 Lumped Modeling of
Sistemi Elettronici Integrati – B 25 Lumped Modeling of Differentially Driven Symmetric Inductors for RF IC Design Egidio Ragonese, Angelo Scuderi, Tonio Biondi, Alessandro Italia, and Giuseppe Palmisano Radio Frequency Advanced Design Center (RF-ADC) Università di Catania Facoltà di Ingegneria DIEES Catania - ITALY Riunione Annuale GE 2006 STMicroelectronics Catania site Ischia, 21 -23 giugno 2006
Introduction q In RF ICs symmetrical inductors are profitable exploited instead of two separate spirals § lower area § full electrical symmetry § higher Q-factor and f. SR q A profitable exploitation of integrated inductors requires simple, accurate and geometrically scalable models q Most inductor models are developed only for single -ended spirals, while the few models for symmetric inductors are not validated for single-ended structures Riunione Annuale GE 2006 Ischia, 21 -23 giugno 2006
Modeling of integrated inductors on Si q Both single-ended and differential inductors were fabricated using a bipolar process supplied by ST -Microelectronics Turn number from 1 to 5. 5, inner diameter from 50 to 150 µm and metal width from 6 to 20 mm Riunione Annuale GE 2006 Ischia, 21 -23 giugno 2006
Modeling of integrated inductors on Si q A scalable model for both single-ended and differential inductors § Modified -like topology (only one fitting parameter) § Physics-based equations based on process/layout parameters § Improved current sheet expression of LS (for sub-n. H inductors) § Novel equation for series resistance (current crowding) Riunione Annuale GE 2006 Ischia, 21 -23 giugno 2006
Model validation q Model validation up to 20 GHz by comparison with onwafer measurements of more than 100 spirals (covering 0. 2 to 8. 3 n. H inductance values) q Accuracy, geometrical scalability and compactness promote the model as a reliable time-saving design tool Average errors on inductance, f. SR and Q are 2%, 5%, and 7% Riunione Annuale GE 2006 Ischia, 21 -23 giugno 2006
Model exploitation: A 5 -GHz image-reject down-converter q Extensively exploitation of integrated inductors (designed with the proposed model) q Differential inductors are used in image-rejection filters Riunione Annuale GE 2006 Ischia, 21 -23 giugno 2006
Model exploitation A 5 -GHz image-reject down-converter Riunione Annuale GE 2006 Ischia, 21 -23 giugno 2006
See you later…. Poster B 25 Riunione Annuale GE 2006 Ischia, 21 -23 giugno 2006
- Slides: 8