Patent ID: 9407278
Filing Date: 2016-08-02
CPC Classification: H03M

Claim Text:
1. A multi-stage digital to analog convertor (DAC) circuit configured to convert a digital input code to an analog output, the circuit comprising a first stage switchably coupled to a primary stage in each of a first DAC path and a second DAC path, the first stage comprising a plurality of impedance elements and wherein the circuit is configured such that operably a switching of the plurality of impedance elements across the primary stage in the first DAC path provides a first plurality (N1) of state changes and a switching of the plurality of impedance elements across the primary stage in the second DAC path provides a second plurality (N1b) of state changes, the second plurality, N1b, being less than the first plurality, N1, and wherein each of the first DAC path and the second DAC path are coupled to a common output of the DAC circuit and at least one of the DAC paths is coupled to an interpolator, the interpolator providing an additional DAC stage to that path.