Integrated Switched Differential Inductor
Original Publication Date: 2003-Jul-17
Included in the Prior Art Database: 2003-Jul-17
Integrated RFICs often utilize several integrated inductors within circuits such as LNAs, mixers, VCOs etc. These inductors occupy a significant amount of silicon die area and we hence seek methods to either increase the inductance per unit area or share certain inductors. Also, differential circuits are commonly used in RFIC implementations and therefore require the use of differential inductors. Furthermore, applications that need to switch frequency bands require either capacitors or inductors that can be switched. This article describes a novel method in which an integrated differential inductor can be switched to provide different inductance values by varying the mutual inductance and lengths of its turns.