Patent ID: 7176818
Filing Date: 2007-02-13
Classification: H03M

Abstract:
1. An analog-to-digital converter to convert an input analog signal to an output digital signal, comprising: a digital-to-analog converter to convert a first digital value of the output digital signal to a first analog value and for feeding back said first analog value to the input of the analog-to-digital converter, said first digital value being emitted by the analog-to-digital converter at a first time instant; first means to determine the difference between the first analog value and a second analog value of the input signal of analog-to-digital converter at a second time instant successive to the first time instant; second means to convert said difference to a digital value; and third means to add or subtract said digital value of said difference to or from said first digital value by obtaining said output digital signal, wherein said first means comprises circuitry to sample said first analog value and said second analog value and to determine the difference between said sampled analog values, and wherein said first means comprises circuitry to compare said sampled analog values and to send a signal representative of said comparison to said third means which, in dependence on it, add or subtract said digital value of said difference to said first digital value by obtaining said output digital signal.