Back to results
US 12,596,081 B2Granted
Compact, low-power, high image rejection sideband separation receiver
AssigneesArizona Board of Regents On Behalfof Arizona State University, California Institute of Technology
InventorsSaeed Zeinolabedinzadeh, Ebrahim Al Seragi, Paul Goldsmith
Life of this patent
Estimating the term…
Abstract
A compact, low-power, high image rejection sideband separation receiver is provided. The receiver observes an input radio frequency (RF) signal of multiple spectral lines (spectral observation), then downconverts the signals to intermediate frequency (IF), and then separates the signals to be observed simultaneously in multiple channels. An embodiment is used to observe a signal (G-band) with two spectral lines and utilizes a two stage Weaver architecture to downconvert the signal's frequency, including a combination of mixers in the second stage that achieves the separation of two different channels.
Claims20
A method for sideband separation in signal receivers comprising:
- receiving a plurality of radio frequency (RF) signals including a plurality of spectral lines;
- mixing and downconverting the plurality of RF signals to first intermediate frequency (IF) signals;
- separating the first IF signals into a plurality of channels, the plurality of channels including two spectral lines and an image rejection ratio produced by pre-selected phase combinations;
- mixing and downconverting the first IF signals into second IF signals, wherein a first signal of the second IF signals accumulates a same phase after the downconversion and a second signal of the second IF signals creates out-of-phase signals at upper and lower channels of the first signal;
- preserving the first signal and eliminating the second signal by summing the upper and lower channels;
- preserving the second signal located at the image frequency of the first signal and eliminating the first signal by differencing the upper and lower channels;
- separating the first signal from the second signal by manipulating a phase and amplitude of the two spectral lines, wherein the separating enables observing the first signal without the second signal;
- and
- detecting chemical spectral information from the first signal.
6 more elements
A circuit for sideband separation in signal receivers comprising:
- a first stage configured to receive a radio frequency (RF) signal, the first stage configured to produce two first intermediate frequency (IF) signals, wherein the two first IF signals are separated into a plurality of channels, the plurality of channels including two spectral lines and an image rejection ratio produced by pre-selected phase combinations;
- a second stage configured to receive the two first IF signals, the second stage configured to produce two second IF signals, wherein a first signal of the two second IF signals accumulates a same phase after the downconversion and a second signal of the two second IF signals creates out-of-phase signals at upper and lower channels of the first signal;
- and
- a third stage configured to compute two resulting frequencies based on a sum and a difference between the two second IF signals, wherein the sum preserves the first of the resulting frequencies and eliminates a second of the resulting frequencies, the second of the resulting frequencies being located at the image frequency of the first of the resulting frequencies, the difference eliminates the first of the resulting frequencies, wherein the first of the resulting frequencies is separated from the second of the resulting frequencies by manipulating a phase and amplitude of the two spectral lines, wherein the separating enables observing the first of the resulting frequencies, wherein chemical spectral information is detected from the first of the resulting frequencies.
1 more element
A method for detecting content of a sample based on emitted spectral lines, the method comprising:
- transmitting a source signal of known frequency, the source signal being received by the sample, the sample emitting a sample signal based on the source signal;
- receiving the sample signal including a plurality of spectral lines;
- mixing and downconverting the sample signal to first intermediate frequency (IF) signals;
- separating the first IF signals into a plurality of channels, the plurality of channels including two spectral lines and an image rejection ratio produced by pre-selected phase combinations;
- mixing and downconverting the first IF signals into second IF signals, wherein a first signal of the second IF signals accumulates a same phase after the downconversion and a second signal of the second IF signals creates out-of-phase signals at upper and lower channels of the first signal;
- preserving the first signal and eliminating the second signal by summing the upper and lower channels;
- preserving the second signal located at the image frequency of the first signal and eliminating the first signal by differencing the upper and lower channels;
- separating the first signal from the second signal by manipulating a phase and amplitude of the two spectral lines, wherein the separating enables observing the first signal without the second signal;
- and
- detecting the content of the sample based on the first signal plurality of channels.
7 more elements
A system for detecting content of a sample based on emitted spectral lines, the system comprising:
- a transmitter configured to transmit a source signal of known frequency, the source signal being received by the sample, the sample emitting a sample signal based on the source signal;
- a receiver configured to receive the sample signal including a plurality of spectral lines, the receiver including:
- a first stage configured to receive a radio frequency (RF) signal, the first stage configured to produce two first intermediate frequency (IF) signals, wherein the two first IF signals are separated into a plurality of channels, the plurality of channels including two spectral lines and an image rejection ratio produced by pre-selected phase combinations;
- a second stage configured to receive the two first IF signals, the second stage configured to produce two second IF signals, wherein a first signal of the two second IF signals accumulates a same phase after the downconversion and a second signal of the two second IF signals creates out-of-phase signals at upper and lower channels of the first signal;
- and
- a third stage configured to compute two resulting frequencies based on a sum and a difference between the two second IF signals, wherein the sum preserves the first of the resulting frequencies and eliminates a second of the resulting frequencies, the second of the resulting frequencies being located at the image frequency of the first of the resulting frequencies, the difference eliminates the first of the resulting frequencies, wherein the first of the resulting frequencies is separated from the second of the resulting frequencies by manipulating a phase and amplitude of the two spectral lines, wherein the separating enables observing the first of the resulting frequencies, wherein chemical spectral information is detected from the first of the resulting frequencies,
- wherein the receiver detects the content of the sample based on the first signal.
4 more elements
Dependencies are inferred from the claim text.