06-10-2016 дата публикации
Номер: US20160291069A1
Принадлежит:
A phase angle can be measured between an analogue signal and a reference signal by converting the analogue signal to digital samples in a residue number system (RNS) analogue-to-digital converter (ADC), based on a RNS scheme. The phase angle can be measured directly from the RNS values output by the RNS ADC, or the RNS values can be converted to a binary scheme, such as straight binary, offset binary or two's complement, before calculating the phase angle measurement. 1. Apparatus for measuring a phase angle from an analogue signal , the apparatus comprising:a residue number system RNS analogue-to-digital converter ADC arranged to output a plurality of digital samples from the first analogue signal according to a RNS scheme; anda phase measurement module arranged to measure a phase angle between the analogue signal and a reference signal, based on the reference signal and the digital samples output by the RNS ADC.2. The apparatus of claim 1 , further comprising:a RNS-to-binary converter connected between the RNS ADC and the phase measurement module, the RNS-to-binary converter being arranged to convert the RNS digital samples to binary values according to a binary coding scheme,wherein the phase measurement module is arranged to measure the phase angle based on the reference signal and the converted digital samples from the RNS-to-binary converter.3. The apparatus of claim 1 , wherein the phase measurement module comprises:a quadrature reference signal generator arranged to generate sine and cosine waveforms according to a frequency of the reference signal;a first multiplier arranged to multiply the digital samples by the cosine waveform to obtain an in-phase I signal component;a second multiplier arranged to multiply the digital samples by the sine waveform to obtain a quadrature Q signal component;a first integrator arranged to integrate the I signal component over time;a second integrator arranged to integrate the Q signal component over time; anda phase angle ...
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