Weak inversion MOS varactors for 0.5 V analog integrated filters
Chatterjee, S.
Musah, T.
Tsividis, Y.
Kinget, P.
Columbia Univ., New York, NY, USA;
This paper appears in: VLSI Circuits, 2005. Digest of Technical Papers. 2005 Symposium on
Publication Date: 16-18 June 2005
On page(s): 272- 275
ISSN:
ISBN: 4-900784-01-X
INSPEC Accession Number: 8573506
Digital Object Identifier: 10.1109/VLSIC.2005.1469384
Current Version Published: 2005-07-25
Abstract
This work proposes a weak-inversion MOS capacitor-based varactor, tuned through the body voltage, for the realization of tunable filters at supply voltages down to 0.5 V. Weak inversion operation results in a distributed series resistance and a model is derived to accurately calculate this frequency dependent resistance. The model matches well with experimental results from test devices in a 0.18 μm CMOS technology. Channel segmentation is used to simulate the varactor. Use of the varactor is demonstrated in the design of tunable filters and good agreement is obtained between simulated and measured performance.
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