Method and apparatus for full-wave rectification of delta-sigma modulated signals

摘要

The present invention relates to method and apparatus for full-wave rectification of AC delta-sigma modulated signals. It comprises of a delta-sigma modulator, rectifying encoder, and polarity detector. It offers “spike” free rectified signals at the lowest amplitudes of AC signals to be rectified.

主权项

1. A “spike” free full wave rectifying or squaring operation circuit, comprising:
a Δ-Σ modulator for producing a pulse density signal Xn; a delay element D for delaying the signal Xn one clock pulse; a XNOR gate for accepting the signal Xn-1 and the signal Zn-1 of polarity detector; a polarity detector logic gates for accepting signals Xn and Xn-1 to produce signal Zn-1; and a low-pass filter (LPF) for demodulation (averaging) of a Yn signal and producing signal y(t), which is the rectified AC input signal x(t).