In accordance with embodiments of the present disclosure, a processing system comprising may include a plurality of processing paths and a filter. The plurality of processing paths may include a first processing path and a second processing path, wherein the first processing path is configured to generate a first digital signal based on an analog input signal and the second processing path is configured to generate a second digital signal based on the analog input signal. The filter may have a corner frequency and may be configured to generate a filtered digital output signal combining spectral components of the first digital signal lower than the corner frequency and spectral components of the second digital signal higher than the corner frequency to generate a filtered digital signal.

A dual delta-sigma modulator includes a first modulator, a second modulator, and a shared amplifier coupled to the first and second modulators. The first modulator includes an integrator configured to generate a first modulator output signal. The second modulator includes a second integrator configured to generate a second modulator output signal. The shared amplifier is configured to assist the first integrator integrating a difference between a first analog input signal and a first modulator output signal from the first modulator during a first period of time and to assist the second integrator integrate a difference between a second analog input signal and a second modulator output signal from the second modulator during a second period of time.

A system may include a delta-sigma analog-to-digital converter and a digital compression circuit. The delta-sigma analog-to-digital converter may include a loop filter having a loop filter input configured to receive an input signal and generate an intermediate signal responsive to the input signal, a multi-bit quantizer configured to quantize the intermediate signal into an uncompressed digital output signal, and a feedback digital-to-analog converter having a feedback output configured to generate a feedback output signal responsive to the uncompressed digital output signal in order to combine the input signal and the feedback output signal at the loop filter input. The digital compression circuit may be configured to receive the uncompressed digital output signal and compress the uncompressed digital output signal into a compressed digital output signal having fewer quantization levels than that of the uncompressed digital output signal.

In accordance with embodiments of the present disclosure, a processing system comprising may include a plurality of processing paths and a filter. The plurality of processing paths may include a first processing path and a second processing path, wherein the first processing path is configured to generate a first digital signal based on an analog input signal and the second processing path is configured to generate a second digital signal based on the analog input signal. The filter may have a corner frequency and may be configured to generate a filtered digital output signal combining spectral components of the first digital signal lower than the corner frequency and spectral components of the second digital signal higher than the corner frequency to generate a filtered digital signal.

Provided are, among other things, systems, apparatuses, methods and techniques for converting a continuous-time, continuously variable signal into a sampled and quantized signal. One such apparatus includes an input line for accepting an input signal that is continuous in time and continuously variable, multiple processing branches coupled to the input line, and an adder coupled to outputs of the processing branches. Each of the processing branches includes a continuous-time quantization-noise-shaping circuit, a sampling/quantization circuit coupled to an output of the continuous-time quantization-noise-shaping circuit, a digital bandpass filter coupled to an output of the sampling/quantization circuit, and a line coupling an output of the digital-to-analog converter circuit back into the continuous-time quantization-noise-shaping circuit. A center frequency of the digital bandpass filter in each the processing branch corresponds to a minimum in a quantization noise transfer function for the continuous-time quantization-noise-shaping circuit in the same processing branch.

Provided are, among other things, systems, methods and techniques for converting a continuous-time, continuously variable signal into a sampled and quantized signal. According to one implementation, an apparatus includes multiple processing branches, each including: a bandpass noise-shaping circuit, a sampling/quantization circuit, and a digital bandpass filter. A combining circuit then combines signals at the processing branch outputs into a final output signal. The bandpass noise-shaping circuits include adjustable circuit components for changing their quantization-noise frequency-response minimum, and the digital bandpass filters include adjustable parameters for changing their frequency passbands.

Various embodiments of the present technology may comprise a method and device for a delta-sigma ADC. The method and device may comprise receiving an input signal to at least two parallel-connected first-stage integrators and corresponding feedback DACs, and simultaneously integrating the input signal by each of the first-stage integrators. The method and device may further comprise a second stage integrator connected in series with the first-stage integrators, a quantizer, and digital to analog converters, coupled between the output of the quantizer and the inputs of the first-stage integrators.

Various embodiments of the present technology may comprise a method and device for a delta-sigma ADC. The method and device may comprise receiving an input signal to at least two parallel-connected first-stage integrators and corresponding feedback DACs, and simultaneously integrating the input signal by each of the first-stage integrators. The method and device may further comprise a second stage integrator connected in series with the first-stage integrators, a quantizer, and digital to analog converters, coupled between the output of the quantizer and the inputs of the first-stage integrators.

A system may include a delta-sigma analog-to-digital converter and a digital compression circuit. The delta-sigma analog-to-digital converter may include a loop filter having a loop filter input configured to receive an input signal and generate an intermediate signal responsive to the input signal, a multi-bit quantizer configured to quantize the intermediate signal into an uncompressed digital output signal, and a feedback digital-to-analog converter having a feedback output configured to generate a feedback output signal responsive to the uncompressed digital output signal in order to combine the input signal and the feedback output signal at the loop filter input. The digital compression circuit may be configured to receive the uncompressed digital output signal and compress the uncompressed digital output signal into a compressed digital output signal having fewer quantization levels than that of the uncompressed digital output signal.

Provided are, among other things, systems, apparatuses, methods and techniques for converting a continuous-time, continuously variable signal into a sampled and quantized signal. One such apparatus includes an input line for accepting an input signal that is continuous in time and continuously variable, multiple processing branches coupled to the input line, and an adder coupled to outputs of the processing branches, with each of the processing branches including a bandpass noise-shaping circuit, a sampling/quantization circuit coupled to an output of the bandpass noise-shaping circuit, a digital bandpass filter coupled to an output of the sampling/quantization circuit, and a line coupling an output of the sampling/quantization converter circuit back into the bandpass noise-shaping circuit. A center frequency of the digital bandpass filter in each processing branch corresponds to a stopband region in a quantization noise transfer function for the bandpass noise-shaping circuit in the same processing branch.