Noise-shaping enhanced gated ring oscillator based analog-to-digital converters

A noise-shaping enhanced (NSE) gated ring oscillator (GRO)-based ADC comprising:

• a delay configured to delay and feedback an error signal to an input of the NSE GRO-based ADC, wherein a feedback error signal provides noise shaping and wherein the error signal is generated at the input of the NSE GRO-based ADC from an input signal, the feedback error signal, and a front-end output signal;
• a GRO configured to output phase signals from a time domain error signal based on the error signal, by oscillating when the time domain error signal is high and inhibiting oscillation when the time domain error signal is not high;
• a quantization device configured to quantize the phase signals to generate the front-end output signal, wherein the front-end output signal provides additional noise shaping;
• and
• an output device configured to generate an output signal based on the front-end output signal and a back-end output signal based on a quantization error extracted from quantized phase signals, wherein the output signal has at least two noise shapings.