Politecnico Di Milano

Lorenzo Combi

Umberto Spagnolini

It is described a modulator apparatus () comprising: an input terminal () structured to receive an analog electrical signal (x(t)) having an information content to be transmitted; a loop filter structured to receive an error signal (&#x3b5;(t) and provide a filtered signal (s(t)), the loop filter being configured to minimize said error signal (&#x3b5;(t)); a modulator device () configured to module the filtered signal (s(t)) and provide a Pulse Width Modulated, PWM, signal (y(t)) to be transmitted including a plurality of pulses having corresponding widths correlated to non-quantized amplitudes of the filtered signal (s(t)); a first pulse width demodulator () configured to receive the PWM, signal (y(t)) and provide a demodulated signal (&#x15d;(t)) and a difference module () configured to receive the analog electrical signal (x(t)) and the demodulated signal (&#x15d;(t)) and provide the error signal (&#x3b5;(t)).

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Pescantina, Italy

Lorenzo Combi