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In this paper, the design of a time-to-digital converter (TDC) for measuring the time of flight (ToF) of a radio pulse is described. The novel idea is based on the adoption of a charge-pump time-to-voltage transducer followed by a sample-and-hold amplifier (SHA) and by a second-order discrete-time incremental Delta-Sigma (????) converter to perform a single-shot conversion. The TDC architecture is capable of achieving a range of 220 ns, a time resolution of about 200 ps (a 10-bit incremental ???? converter), and robustness with respect to temperature variations. The design has been successfully verified through simulations both at system and transistor levels using a 0.25-??m complimentary metal-oxide-semiconductor (CMOS) technology with a -2.5- to + 4-V power supply.
Instrumentation and Measurement, IEEE Transactions on (Volume:59 , Issue: 5 )
Date of Publication: May 2010