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Abstract

A pulse density modulator unit transforms an N-bit input signal representing an input value, into an output digital signal having a digital pulse density which is a linear function of the input value. The pulse density modulator unit includes a first pulse density modulator which produces a binary signal representing a multiplication factor as a pulse density. It further includes a combination module which receives the input signal, the binary signal from the first pulse density modulator and an offset control signal. The combination module produces a combined signal which, on average, represents the product of the input signal and the amplification control signal, offset by an amount dependent upon the offset control signal. A second pulse generator uses the combined signal to generate the output digital signal. The combination module may be a selector.

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First Claim