Picosecond-Accuracy Digital-to-Time Converter for Phase-Interpolation DDS

Abstract

A high-resolution CMOS Digital-to-Time Converter for Direct-Digital-Synthesis (DDS) applications is presented in this paper. The novel architecture permits one to perform 4096 phase-interpolation levels introducing a delay proportional to a 12-bit digital control word with a resolution of about 2 ps. The virtual multiplication of the 120 MHz accumulator clock frequency by the factor 4096 is, thus, realized achieving a great reduction of the DDS output spurious components. The phase interpolation, implemented in two steps, is based on Delay-Locked Delay-Lines that are able to assure the reliability of the introduced delay by fully compensating environmental and process variations. The circuit is very compact in terms of occupied silicon area, since it employs only 35 delay-cells.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 2004
Accession Number
ADA427910

Entities

People

  • D. Lunardini
  • F. Baronti
  • R. Roncella
  • R. Saletti

Organizations

  • University of Pisa

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Accuracy
  • Capacitors
  • Clocks
  • Communication Systems
  • Control Systems
  • Converters
  • Delay Lines
  • Diagrams
  • Frequency
  • Generators
  • High Resolution
  • Interpolation
  • Simulations
  • Sine Waves
  • Time Intervals
  • Waveforms
  • Waves

Fields of Study

  • Engineering
  • Physics

Readers

  • Approximation Theory.
  • Integrated Circuit Design and Technology.
  • Small Business Innovation Research Program (SBIR) EDI Research and Innovation.