Systems, devices, and methods related to low-noise, high-accuracy single-ended continuous-time sigma-delta (CTSD) analog-to-digital converter (ADC) are provided. An example single-ended CTSD ADC includes a pair of input nodes to receive a single-ended input signal and input circuitry. The input circuitry includes a pair of switches, each coupled to one of the pair of input nodes; and an amplifier to provide a common mode signal at a pair of first nodes, each before one of the pair of switches. The single-ended CTSD ADC further includes digital-to-analog converter (DAC) circuitry; and integrator circuitry coupled to the input circuitry and the DAC circuitry via a pair of second nodes.

To convert a first stage input to a digital output, a delta-sigma modulator, an analog-to-digital converter and an associated signal conversion method based on an MASH structure are provided. The analog-to-digital converter includes the delta-sigma modulator and a sample and hold circuit. The delta-sigma modulator includes a first signal converter, a second signal converter and a digital cancellation logic. The first signal converter converts the first stage input to a first converted output. The first signal converter shapes a first stage quantization error to generate a second stage input. The first stage input and the second stage input are analog signals. The second signal converter converts the second stage input to a second converted output. The digital cancellation logic generates a digital output according to the first converted output and the second converted output.

Adaptive toggle number compensation techniques for reducing data dependent supply noise in DACs are disclosed. Various embodiments are based on setting a certain target toggle number for a plurality of DAC units used to convert at least a portion of a digital data sample and then applying various adaptive techniques to try to achieve the target toggle number in converting the data sample from digital to analog domain. Adaptive toggle number compensation techniques described herein try to reduce data dependent supply noise by deliberately limiting, to a certain target number, the number of DAC units that undergo a switch from the digital input of 1 to 0 or from 0 to 1 in converting a digital data sample. Compared to the conventional dummy signal generation approach, such adaptive toggle number compensation techniques may provide significant savings in terms of power consumption of a DAC.

Techniques to deliver a precision low noise reference voltage to a precision analog-to-digital converter without the need of a reference buffer or digital correction. In an example, a technique can use an integrated resistor divider and external capacitor to derive a low noise precision reference voltage either from the power supply of the ADC, or from an integrated reference source.

To convert a first stage input to a digital output, a delta-sigma modulator, an analog-to-digital converter and an associated signal conversion method based on an MASH structure are provided. The analog-to-digital converter includes the delta-sigma modulator and a sample and hold circuit. The delta-sigma modulator includes a first signal converter, a second signal converter and a digital cancellation logic. The first signal converter converts the first stage input to a first converted output. The first signal converter shapes a first stage quantization error to generate a second stage input. The first stage input and the second stage input are analog signals. The second signal converter converts the second stage input to a second converted output. The digital cancellation logic generates a digital output according to the first converted output and the second converted output.

Provided are apparatuses and methods, in which a disturbed measurement variable is converted to a digital signal. The digital signal is then averaged over a number of sampling values which corresponds to a period of the disturbances.

Provided are apparatuses and methods, in which a disturbed measurement variable is converted to a digital signal. The digital signal is then averaged over a number of sampling values which corresponds to a period of the disturbances.