A wideband low-power continuous-time delta-sigma modulator for next generation wireless applications Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/zp38wf62x

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  • Delta-Sigma (ΔΣ) analog-to-digital converters (ADCs) are widely used in wireless transceivers. Recently, continuous-time (CT) ΔΣ ADCs gain growing interest in wireless applications for their lower power consumption and wider input bandwidth as compared with the discrete-time (DT) counterparts. In this thesis, a wideband low-power CT ΔΣ modulator for next generation wireless applications is proposed to achieve 10-bit dynamic range within a 25 MHz signal bandwidth. On the system level, a low-power, mainly feed-forward architecture is used to realize the loop filter. Feed-in branches are added and optimized to eliminate the out-of-band peaking in the signal transfer function. On the circuit level, two-stage operational amplifiers with class-AB output stages are used to implement low-power active RC integrators. Capacitor tuning is used to compensate the variation of RC time constants. In addition, a fast current adder, an 11-level internal flash ADC and three current feedback DACs are also integrated on the chip which was manufactured in TSMC 0.18 μm CMOS technology. The test results show that the modulator draws less than 10 mA from the 1.8 V supply voltage.
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  • description.provenance : Approved for entry into archive by Julie Kurtz(julie.kurtz@oregonstate.edu) on 2007-03-26T18:15:29Z (GMT) No. of bitstreams: 1 dissertation.pdf: 6020348 bytes, checksum: fc2dcb2cf3082a76f2897e37b1fece14 (MD5)
  • description.provenance : Submitted by Xuefeng Chen (chenxu@onid.orst.edu) on 2007-03-20T23:02:13Z No. of bitstreams: 1 dissertation.pdf: 6020348 bytes, checksum: fc2dcb2cf3082a76f2897e37b1fece14 (MD5)
  • description.provenance : Made available in DSpace on 2007-03-26T20:58:54Z (GMT). No. of bitstreams: 1 dissertation.pdf: 6020348 bytes, checksum: fc2dcb2cf3082a76f2897e37b1fece14 (MD5)

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