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 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;
an analog-to-digital (A/D) converter configured to receive the down-converted signal and to generate a down-converted digital signal;
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;
a digital-to-analog (D/A) converter configured to output an analog voltage signal based on the comparison of the down-converted digital signal to the previous down-converted digital signal;
a voltage controlled oscillator (VCO) configured to a generate a pulse signal based on the analog voltage signal; and
a pulse generator configured to generate aperture pulses in the control signal based on the pulse signal, wherein the aperture pulses are an input to a switch.
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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
18 Claims
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1. An apparatus for down-converting an electromagnetic signal, the apparatus comprising:
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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; an analog-to-digital (A/D) converter configured to receive the down-converted signal and to generate a down-converted digital signal; 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; a digital-to-analog (D/A) converter configured to output an analog voltage signal based on the comparison of the down-converted digital signal to the previous down-converted digital signal; a voltage controlled oscillator (VCO) configured to a generate a pulse signal based on the analog voltage signal; and a pulse generator configured to generate aperture pulses in the control signal based on the pulse signal, wherein the aperture pulses are an input to a switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. 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; converting the down-converted signal to a down-converted digital signal; comparing the down-converted digital signal to a previous down-converted digital signal; generating an analog voltage signal based on the comparison of the down-converted digital signal to the previous down-converted digital signal; generating a pulse signal based on the analog voltage signal; and generating aperture pulses in the control signal based on the pulse signal, wherein the electromagnetic signal is down-converted based on the aperture pulses. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification