DC offset, re-radiation, and I/Q solutions using universal frequency translation technology
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Abstract
Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal, and applications thereof are described herein. Reducing or eliminating DC offset voltages and re-radiation generated when down-converting an electromagnetic (EM) signal is also described herein. Down-converting a signal and improving receiver dynamic range is also described herein.
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Citations
25 Claims
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1. (canceled)
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2. An apparatus for down-converting an input signal, comprising:
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a first frequency down-conversion module that receives an input signal, wherein the first frequency down-conversion module down-converts the input signal according to a first control signal and outputs a first down-converted signal;
a second frequency down-conversion module that receives the input signal, wherein the second frequency down-conversion module down-converts the input signal according to a second control signal and outputs a second down-converted signal; and
a subtractor module that subtracts the second down-converted signal from the first down-converted signal and outputs a single channel down-converted signal;
wherein the first frequency down-conversion module comprises a first switch and a first storage element, wherein the first switch is coupled to the first storage element at a first node and coupled to a first reference potential; and
wherein the second frequency down-conversion module comprises a second switch and a second storage element, wherein the second switch is coupled to the second storage element at a second node and coupled to a second reference potential;
- View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of down-converting an electromagnetic signal, comprising the steps of:
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(1) receiving an input signal;
(2) frequency down-converting the input signal with a first frequency down-conversion module to a first down-converted signal;
(3) frequency down-converting the input signal with a second frequency down-conversion module to a second down-converted signal;
(4) subtracting the second down-converted signal from the first down-converted signal to form a first output signal;
(5) frequency down-converting the input signal with a third frequency down-conversion module to a third down-converted signal;
(6) frequency down-converting the input signal with a fourth frequency down-conversion module to a fourth down-converted signal; and
(7) subtracting the fourth down-converted signal from the third down-converted signal to form a second output signal;
wherein the input signal comprises an in-phase/quadrature-phase (I/Q) modulated signal, and wherein step (2) comprises the step of;
(A) frequency down-converting the input signal to a non-inverted I-phase signal portion of the I/Q modulated signal;
wherein step (3) comprises the step of;
(A) frequency down-converting the input signal to an inverted I-phase signal portion of the I/Q modulated signal. wherein step (5) comprises the step of;
(A) frequency down-converting the input signal to a non-inverted Q-phase signal portion of the I/Q modulated signal; and
wherein step (6) comprises the step of;
(A) frequency down-converting the input signal to an inverted Q-phase signal portion of the I/Q modulated signal. - View Dependent Claims (14, 15, 16, 17)
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18. A method of down-converting an input signal, comprising:
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(1) receiving a radio-frequency (RF) I/Q input signal;
(2) down-converting the RF I/Q input signal with a first down-conversion module according to a first energy transfer signal to form a first down-converted signal; and
(3) down-converting the RF I/Q input signal with a second down-conversion module according to a second energy transfer signal to form a second down-converted signal;
wherein the second energy transfer signal is phase-shifted by 90+m·
180 degrees of a frequency of the RF I/Q input signal relative to the first energy transfer signal, wherein m is any integer greater than or equal to 1;
wherein the first down-converted signal comprises an in-phase information signal; and
wherein the second down-converted signal comprises a quadrature-phase information signal. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification