Parallel Multi-Band DAC Architecture for Stable High-Resolution Output

The patent divides the high-resolution conversion task into multiple parallel lower-resolution conversion paths (e.g., 4 paths of 2-bit converters instead of one 4-bit converter). Each path processes a portion of the input signal with relaxed precision requirements, and the results are combined through digital processing and filtering to achieve the overall high resolution. This segmentation allows each segment to operate at higher speeds with less stringent component matching requirements.

The patent changes the resolution parameter distribution across parallel channels, using multiple low-resolution converters instead of a single high-resolution converter. It also employs digital filtering and noise shaping techniques that modify the frequency domain characteristics to push quantization noise out of the signal band, thereby achieving high effective resolution without requiring high instantaneous bandwidth in each individual channel.

The patent segments the noise shaping function across multiple parallel lower-order modulators rather than using a single high-order modulator. Each parallel channel uses a stable low-order modulator (e.g., first-order or second-order) that can operate reliably at very high sample rates, and the combined output achieves the equivalent noise shaping performance of a high-order system without the stability problems.

The patent uses multiple simple, robust low-order modulator structures that are easier to implement and more stable at high speeds, rather than attempting to implement complex high-order modulators. The simplicity of each individual modulator makes them more reliable and easier to manufacture with consistent performance.