An improved gated-oscillator time-base and associated auto-calibration algorithm for use in a high-accuracy sampling waveform acquistion system are described. The time-base architecture consists of a stable 100 MHz gated-oscillator, 24-bit counter chain, and a clock period interpolator. The nominal, uncorrected linearity of the time-base is approximately +/-30 ps. By using an iterative, sine-fit based algorithm, the linearity has been improved to < + /-5 ps. Details of the performance and major sources of error of the time-base and correction algorithm in an equivalent time sampling system are also discussed.
Proceedings Title: Proc. IEEE Instrumentation and Technology Conference (IMTC)
Conference Dates: May 1-4, 2000
Conference Location: Baltimore, MD
Pub Type: Conferences
auto-calibration, comparator, counter, equivalent-time, oscillator, ramp, sampling, sine-fit, time-base