A 2-GHz analog-to-digital delta-sigma modulator for CDMA receivers with 79-dB signal-to-noise ratio in 1.23-MHz bandwidth

This paper presents the design of a second-order single-bit analog-to-digital continuous-time delta-sigma modulator (CT-/spl Delta//spl Sigma/M) that can be used in wireless CDMA receivers. The CT-/spl Delta//spl Sigma/M samples at 2 GHz, consumes 18 mW at 1.8 V and has a 79-dB signal-to-noise ratio...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 2004-11, Vol.39 (11), p.1819-1828
Main Authors: Dagher, E.H., Stubberud, P.A., Masenten, W.K., Conta, M., Dinh, T.V.
Format: Article
Language:English
Subjects:
Analog to digital conversion
Applied sciences
Bandwidth
Circuit properties
Circuits
CMOS
Code division multiple access
Delta modulation
Digital communication
Digital filters
Dynamic range
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Filtering
Integrated circuits
Integrated circuits by function (including memories and processors)
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Modulators
Multiaccess communication
Receivers
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Signal convertors
Signal to noise ratio
Specifications
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Summary:This paper presents the design of a second-order single-bit analog-to-digital continuous-time delta-sigma modulator (CT-/spl Delta//spl Sigma/M) that can be used in wireless CDMA receivers. The CT-/spl Delta//spl Sigma/M samples at 2 GHz, consumes 18 mW at 1.8 V and has a 79-dB signal-to-noise ratio (SNR) over a 1.23-MHz bandwidth. The CT-/spl Delta//spl Sigma/M was fabricated in a 0.18-/spl mu/m 1-poly 6-metal, CMOS technology and has an active area of approximately 0.892 mm/sup 2/. The /spl Delta//spl Sigma/M's critical performance specifications are derived from the CDMA receiver specifications.
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.2004.835831