ERROR-FEEDBACK DIGITAL-TO-ANALOG CONVERTER (DAC)

摘要

In one embodiment, a method for converting an input digital signal into an analog signal is provided. The method comprises modulating the input digital signal into a modulated digital signal, and converting the modulated digital signal into the analog signal using a digital-to-analog converter (DAC). The modulation shapes quantization noise of the DAC to place a notch at a frequency within an out-of-bound frequency band to reduce the quantization noise within the out-of-bound frequency band.

主权项

1. A circuit, comprising:
a transmit mode controller configured to adjust a sampling frequency of an input digital signal; an error-feedback modulator configured to receive the input digital signal, and to modulate the digital input signal into a modulated digital signal; and a digital-to-analog converter (DAC) configured to convert the modulated digital signal into an analog signal; wherein the error-feedback modulator is configured to modulate the input digital signal to shape quantization noise of the DAC to place a notch at a frequency within an out-of-bound frequency band to reduce the quantization noise within the out-of-bound frequency band.