Analog to digital conversion circuit including a digital decimation filtering circuit

An analog to digital conversion circuit comprises:

• an analog to digital converter (ADC) circuit operable to convert an analog signal having an oscillation frequency into a first digital signal having a first data rate frequency, wherein the analog signal includes a set of pure tone components, and wherein the first digital signal includes n 1-bit channels;
• a digital decimation filtering circuit including:
• n anti-aliasing filters operable to receive the n 1-bit channels of the first digital signal via an n-line parallel bus, wherein the n anti-aliasing filters are operable to:
• sample the n 1-bit channels of the first digital signal to produce n sampled digital signals;
• and
• filter the n sampled digital signals to remove frequencies higher than a selected cutoff frequency to produce n second digital signals;
• and
• n decimator circuits operable to decimate the n second digital signals to produce n third digital signals at a second data rate frequency, wherein the first data rate frequency is greater than the second data rate frequency;
• and
• a multiplexor operable to multiplex the n third digital signals on a single bus.