Sine-wave generator including finite impulse response filter-based harmonic cancellation

A method comprising:

• receiving a square wave having a frequency at an input of a harmonic-cancellation (HC) sine-wave generator;
• receiving a clock signal having a clock frequency at a clock input of the HC sine-wave generator;
• generating one or more delayed square waves based on the received square wave and the clock signal using one or more delay components of the HC sine-wave generator;
• amplitude-scaling the square wave and the one or more delayed square waves using a plurality of taps of the HC sine-wave generator to produce a plurality of amplitude-scaled square waves;
• adding the plurality of amplitude-scaled square waves using summing circuitry of the HC sine-wave generator to produce a sine wave having tone at the frequency with suppressed signal strength at selected harmonics of the frequency of the square wave;
• and
• providing the sine wave to an output terminal of the HC sine-wave generator.

A device comprising:

• a first harmonic-cancellation (HC) sine-wave generator including:
• a first input to receive a first square wave having a first frequency;
• a second input to receive a first clock signal having a first clock frequency;
• an output terminal;
• first delay elements in a sequence configured to receive the first square wave and the first clock signal and to produce one or more first delayed square waves;
• one or more first taps configured to produce first amplitude-scaled square waves based on the first square wave and the one or more first delayed square waves;
• one or more second HC sine-wave generators, each of the one or more second HC sine-wave generators including:
• a first input to receive a second square wave having a second frequency;
• a second input to receive a second clock signal having a second clock frequency;
• one or more second delay elements in a sequence and configured to receive the second square wave and the second clock signal and to produce one or more second delayed square waves;
• one or more second taps configured to produce second amplitude-scaled square waves based on the second square wave and the one or more second delayed square waves and to produce the one or more second amplitude-scaled square waves;
• and
• summing circuitry configured to add the first amplitude-scaled square waves and one or more of the second amplitude-scaled square waves from the one or more second HC sine-wave generators to produce a sine wave having a first tone at the first frequency and one or more second tones at the one or more second frequencies and including suppressed energy at selected harmonics of the first frequency and the one or more second frequencies, the summing circuitry to provide the sine wave to the output terminal.