| 摘要 |
FIELD: instruments. SUBSTANCE: method may be used in design of high-precision instruments which measures complex of measuring characteristics, including static and dynamic non-linear distortion, differential amplification, amplitude, amplitude-frequency response, pulse characteristics. Method involves generation of reference low- frequency constituent a(t,s), amplitude b(t, s) and phase Φ(t,s) envelops of radio pulse constituent of p-th signal, which depend on time t and s-th value of amplitude, generation of reference test signal as random series of signals which amplitude, polarity of components and pedestal r, which is used as base for reference tests signal, vary in random and correspond to set of all possible values of test signal which belong to dynamic range of analog-to- digital converter to be tested. Each s-th value of amplitude and polarity is used for generation of all S phases:After this, method involves limited-digit generation of reference low- frequency constituent A(t,s,S),, amplitude B(t,s,S) and phase ν(t,s,S) envelops of radio pulse constituent of test signal, which depend on time t, s-th value of amplitude and series number S,, generation of p-th test signal in digital form, generation of p-th test signal in analog form by means of preliminary distortion of p-th reference test signalfor each s-th value of amplitude and polarity by means of identification method using function:Analysis of test signal involves calculation of mean value of instantaneous values of distorted test signal at output of analog-to- digital converter for L realizations of tests signals. This results in signal:After this, signalat output of analog-to-digital converter is corrected of test signalis distorted for each s-th value of amplitude and polarity by means of identification method using function:Components of matrixare used as parameters which describe all complex of measuring characteristics of analog-to-digital converter. EFFECT: increased information capacity of measurements due to recovery of functions which describe variation in constituents of test signal; increased speed of measurements due to decreased number of calculation; increased precision of evaluation of complex of distortions which are caused by analog-to-digital converter, taking into account their interdependency due to selection of best ratio between preliminary distortion and correction rate during identification; optimal conditions for testing analog-to-digital converter and selection of optimal mode of its operations. |
