Apparatus and method for sigma-delta modulator quantization noise cancellation

A method for improved quantization noise cancellation, the method comprising:

• receiving, at a digital-to-time converter, a cancellation code from a sigma-delta modulator and a clock embedded with a quantization noise due to the sigma-delta modulator, wherein the cancellation code is tapped over time from an internal integrator of the sigma-delta modulator and is proportional to the quantization noise due to the sigma-delta modulator;
• resetting, by the digital-to-time converter, the digital-to-time converter by using one edge of the clock to remove memory effects for each cancellation code;
• substantially phase aligning, by the digital-to-time converter, the cancellation code with the quantization noise by using another edge of the clock;
• and
• cancelling, by the digital-to-time converter, the quantization noise from the clock.

A digital-to-time converter, comprising:

• a circuit configured to receive a cancellation code from a sigma-delta modulator and a clock embedded with a quantization noise due to the sigma-delta modulator, wherein the cancellation code is tapped over time from an internal integrator of the sigma-delta modulator and is proportional to the quantization noise due to the sigma-delta modulator;
• a reset circuit configured to reset the digital-to-time converter by using one edge of the clock to remove memory effects for each cancellation code;
• and
• the circuit further configured to substantially phase align the cancellation code with the quantization noise by using another edge of the clock and cancel the quantization noise from the clock.