Down-conversion of an electromagnetic signal with feedback control
First Claim
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1. An apparatus for down-converting an electromagnetic signal, the apparatus comprising:
- an energy storage module;
an energy transfer device configured to receive the electromagnetic signal and a control signal, to down-convert the electromagnetic signal based on the control signal, and to output a down-converted signal that is formed from energy transferred from the electromagnetic signal to the energy storage module at an aliasing rate that is equal to or less than twice the frequency of the electromagnetic signal;
an analog-to-digital (A/D) converter configured to receive the down-converted signal from the energy storage module and to generate a down-converted digital signal; and
a state machine device configured to receive the down-converted digital signal and to compare the down-converted digital signal to a previous down-converted digital signal, wherein the state machine device uses the down-converted digital signal as feedback to continually modify a frequency and phase relationship between the control signal and the received electromagnetic signal to maintain a specified amplitude for the down-converted digital signal.
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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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19 Claims
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1. An apparatus for down-converting an electromagnetic signal, the apparatus comprising:
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an energy storage module; an energy transfer device configured to receive the electromagnetic signal and a control signal, to down-convert the electromagnetic signal based on the control signal, and to output a down-converted signal that is formed from energy transferred from the electromagnetic signal to the energy storage module at an aliasing rate that is equal to or less than twice the frequency of the electromagnetic signal; an analog-to-digital (A/D) converter configured to receive the down-converted signal from the energy storage module and to generate a down-converted digital signal; and a state machine device configured to receive the down-converted digital signal and to compare the down-converted digital signal to a previous down-converted digital signal, wherein the state machine device uses the down-converted digital signal as feedback to continually modify a frequency and phase relationship between the control signal and the received electromagnetic signal to maintain a specified amplitude for the down-converted digital signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for down-converting an electromagnetic signal, the method comprising:
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receiving the electromagnetic signal and a control signal; down-converting the electromagnetic signal based on the control signal to generate a down-converted signal, wherein the down-converted signal is formed from energy transferred from the electromagnetic signal to an energy storage module at an aliasing rate that is equal to or less than twice the frequency of the electromagnetic signal; and controlling a frequency and phase relationship between the electromagnetic signal and the control signal based on the down-converted signal by converting the down-converted signal to a down-converted digital signal and comparing the down-converted digital signal to a previous down-converted digital signal, wherein the down-converted digital signal is used as feedback to continually modify the frequency and phase relationship between the control signal and the received electromagnetic signal to maintain a specified amplitude for the down-converted digital signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification