An 8-GHz continuous-time Σ-Δ analog-digital converter in an InP-based HBT technology

Author

Krishnan, Sundararajan ; Scott, Dennis ; Griffith, Zach ; Urteaga, Miguel ; Wei, Yun ; Parthasarathy, Navin ; Rodwell, Mark

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of California, Santa Barbara, CA, USA

Volume

51

Issue

12

fYear

2003

Firstpage

2555

Lastpage

2561

Abstract

We report an 8-GHz clock-rate, second-order continuous-time Σ-Δ analog-digital converter (ADC) that achieves 57.4-, 51.7-, and 40.2-dB SNR at signal sampling rates of 125, 250, and 500 Ms/s, respectively. The integrated circuit occupied 1.45-mm² die area, contains 76 transistors, is fabricated in an InP-based HBT technology, and dissipates ∼1.8 W. We also study the effect of excess delay on modulator performance, and show that excess delay does not affect performance as long as the centroid-in-time of the digital-analog converter pulse remains stationary.

Keywords

III-V semiconductors; heterojunction bipolar transistors; indium compounds; modulators; sigma-delta modulation; Σ-Δ ADC; Σ-Δ analog-digital converter; 1.8 W; 40.2 dB; 51.7 dB; 57.4 dB; InP; InP based HBT technology; SNR; integrated circuit; modulator; Analog-digital conversion; Analog-digital integrated circuits; Clocks; Delay effects; Digital integrated circuits; Digital modulation; Heterojunction bipolar transistors; Integrated circuit technology; Pulse modulation; Signal sampling;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2003.820176

Filename

1256789