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| Study on Phase Error and Its Uncertainty of
Broadband Sampling Oscilloscope Zhang Zhe£¬Lin Maoliu£¬Chen Chunyu (School of Electronics and Information Technology£¬Harbin Institute of Technology£¬Harbin 150001£¬China) Abstract£ºA simulation model of sampling circuit SPICE of 50 GHz broadband sampling
oscilloscope was developed based on the electric parameter modeling of discrete componentsª±The
model parameters were constructed according to the circuit frame and multiª²dimensional
and subtle electrical measurements of a disassembled sampling headª±Since the electric
parameters are intuitional and have specific physical meanings£¬this method is simpler
and more precise than the mathematical modeling methodª± Under the premise that the
uncertainty of each parameter of the model is 10%£¬the phase error of approximate 7.03¡ã
and the standard uncertainty of 1.34¡ã are synthesized through quantizing the influence of
each component parameter£¬and a conclusion that the impact of diode¡¯s gradient factor
on the phase error is larger than that of the diode¡¯s zeroª²bias junction capacitance
is drawnª±The simulation results show that compared with mathematical modeling£¬the
proposed method is easier to analyze the phase error uncertainty£¬and the phase error is
decreased by 45%£® |
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