Digital excess loop delay compensation technique with embedded truncator for continuous‐time delta–sigma modulators

A novel implementation is proposed to relax the specifications of the internal feedback path for a continuous‐time delta–sigma modulator. A truncator is embedded into the digital excess loop delay (ELD) compensation path. Thermometer‐coded truncation is achieved by re‐ordering the reference voltages of the internal quantiser. This requires only a small amount of extra digital circuitry compared to the conventional digital ELD compensation. The digital encoder controlling the digital‐to‐analogue converter is simple, and it only introduces a small ELD.