Patent ID: 7852249

Claim:
An analog-to-digital converter comprising: an input node for receiving an input signal; a quantizer configured to convert a first analog signal to a digital value with a first sampling frequency; a forward signal arrangement coupled between the input node and the quantizer; a first delay element coupled to the quantizer, the first delay element being configured to delay the digital value by a first delay period resulting in a first delayed value; a first digital-to-analog conversion arrangement coupled between the first delay element and the forward signal arrangement, the first digital-to-analog conversion arrangement being configured to generate a first feedback signal by digitally filtering the first delayed value, the first digital-to-analog conversion arrangement being configured for a second sampling frequency, the second sampling frequency being less than the first sampling frequency; a second delay element coupled to the quantizer, the second delay element being configured to delay the digital value by a second delay period resulting in a second delayed value; and a second digital-to-analog conversion arrangement coupled between the second delay element and the forward signal arrangement, the second digital-to-analog conversion arrangement being configured to generate a second feedback signal by digitally filtering the second delayed value, wherein the forward signal arrangement produces the first analog signal based on the input signal, the first feedback signal, and the second feedback signal.