A 1.3-GHz IF digitizer using a 4th-order continuous-time bandpass ΔΣ modulator

Todd Kaplan*, Jose Cruz-Albrecht, Mehran Mokhtari, Dave Matthews, Joe Jensen, Mau-Chung Chang

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

24 Scopus citations

Abstract

We present a 4th-order, 3-bit, 4.3 GHz continuous-time bandpass ΔΣ modulator (CT-DSM) that can directly digitize a 1.3-GHz IF signal. We used the impulse-invariant transform to design the CT-DSM, which has a similar NTF as an idealized discrete-time modulator despite up to 1.6 clock delays in its feedback loop paths. The part was fabricated using InP HBT technology, and has a measured SNDR of 39 dB in a 200 MHz bandwidth.

Original languageEnglish
Pages (from-to)127-130
Number of pages4
JournalProceedings of the Custom Integrated Circuits Conference
DOIs
StatePublished - 19 Nov 2003
EventProceedings of the IEEE 2003 Custom Integrated Circuits Conference - San Jose, CA, United States
Duration: 21 Sep 200324 Sep 2003

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