Demodulation mixing for a near field communications (NFC) device
AssigneeBroadcom Innovision Limited
InventorAlastair Lefley
Life of this patent
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Abstract
An in-phase, quadrature phase (IQ) mixer for a near field communications (NFC) device is disclosed that includes a signal provider that provides an in-phase (I) mixing signal and a quadrature phase (Q) mixing signal so that the period of the I mixing signal is equal to a period for the Q mixing signal. A controller is configured to control the signal provider so that the average of the I mixing signal over two periods is minimized and the average of the Q mixing signal over two periods is also minimized. The controller is also configured to control the signal provider so that the average propagation delay for the I mixing signal and the Q mixing signal is minimized individually and relative to each other.
Claims20
An in-phase, quadrature-phase (IQ) mixer, comprising:
- a signal provider configured to provide an in-phase (I) mixing signal and a quadrature-phase (Q) mixing signal, wherein a period for the I mixing signal is equal to a period for the Q mixing signal;
- a controller configured to control the signal provider so that:
- the I mixing signal is at a first level for an equal number of clock cycles during the period as is the Q mixing signal,
- the I mixing signal is at a second level for an equal number of clock cycles during the period as is the Q mixing signal, and
- the I mixing signal is at a null for an equal number of clock cycles during the period as is the Q mixing signal, wherein the null is equal to a remainder of the period that the I mixing signal and the Q mixing signal are not at the first level or the second level;
- and
- a clock signal provider configured to provide a clock signal to the signal provider and the controller, wherein the clock cycles are derived from the clock signal.
An in-phase, quadrature-phase (IQ) mixer, comprising:
- a signal provider configured to provide an in-phase (I) mixing signal and a quadrature-phase (Q) mixing signal, wherein a period for the I mixing signal is equal to a period for the Q mixing signal;
- a controller configured to control the signal provider so that:
- an average of the I mixing signal, at a first level for a first quantity of clock cycles and at a second level for a second quantity of clock cycles, over a first I mixing signal period and a second I mixing signal period is minimized,
- an average propagation delay for the I mixing signal over the first I mixing signal period and the second I mixing signal period is minimized,
- an average of the Q mixing signal, at the first level for the first quantity of clock cycles and at the second level for the second quantity of clock cycles, over a first Q mixing signal period and a second Q mixing signal period is minimized, and
- an average propagation delay for the Q mixing signal over the first Q mixing signal period and the second Q mixing signal period is minimized;
- and
- a clock signal provider configured to provide a clock signal to the signal provider and the controller, wherein the clock cycles are derived from the clock signal.
An in-phase, quadrature-phase (IQ) mixer, comprising:
- a signal provider configured to provide an in-phase (I) mixing signal and a quadrature-phase (Q) mixing signal, wherein a period for the I mixing signal is equal to a period for the Q mixing signal;
- a controller configured to control the signal provider so that:
- an average of the I mixing signal at a first level for a first quantity of clock cycles and at a second level for a second quantity of clock cycles over a first I mixing signal period and a second I mixing signal period is minimized,
- an average propagation delay for the I mixing signal over the first I mixing signal period and the second I mixing signal period is minimized based on the I mixing signal being at a I mixing signal null,
- an average of the Q mixing signal at a first level for a first quantity of clock cycles and at a second level for a second quantity of clock cycles over a first Q mixing signal period and a second Q mixing signal period is minimized, and
- an average propagation delay for the Q mixing signal over the first Q mixing signal period and the second Q mixing signal period is minimized based on the Q mixing signal being at a Q mixing signal null;
- and
- a clock signal provider configured to provide a clock signal to the signal provider and the controller, wherein the clock cycles are derived from the clock signal.
Dependencies are inferred from the claim text.