A Q-Enhanced 3.6   GHz, Tunable, Sixth-Order Bandpass Filter Using 0.18   μm CMOS. (18th June 2007)

• Record Type: Journal Article
• Authors: Dinh, Anh; Ge, Jiandong
• Other Names: Silva-Martinez Jose Academic Editor.
• Is Part Of: VLSI design. Volume 2007(2007)
• Publication Date: 2007-06-18
• Subjects: Integrated circuits -- Very large scale integration -- Periodicals; 621.395
• DOI: 10.1155/2007/84650
• Languages: English
• ISSNs: 1065-514X

Abstract

Abstract : An experimental filter was designed to operate at 3.6 GHz using mainstream 0.18 μ m CMOS. In the design, theQ -enhancement technique was used to overcome the low-Q characteristics of the CMOS on-chip inductors. A sixth-order bandpass filter with a wide passband and a high image rejection was built by cascading three stages of second-orderQ -enhanced filters. A combination of three biquads with offset in center frequency provides wider tuning frequency and bandwidth. This high-performance filter provides a 340 MHz tunable center frequency around 3.6 GHz, an image rejection of 50 dB and a tunableQ from 25 to 50 for a bandwidth adjustment from 95 MHz to 35 MHz. The filter achieves an 18 dB voltage gain while consuming 130 mW of power at 1.8 V DC supply. The chip occupies an area of900 × 900 μ m 2 including all the required bonding pads. The design provides a simple architecture to simplify tuning scheme for both frequency and bandwidth for practical use. The tunable ability of the design could be exploited in further study to be used as a channel-select filter in the gigahertz range.