Compact, low-power, high image rejection sideband separation receiver
AssigneesArizona Board of Regents on behalf of Arizona State University, California Institute of Technology
InventorsSaeed ZEINOLABEDINZADEH, Ebrahim AL SERAGI, Paul GOLDSMITH
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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 radio frequency (RF) signal including a plurality of spectral lines;
- mixing and downconverting the RF signal to first intermediate frequency (IF) signals;
- mixing and downconverting the first IF signals into second IF signals;
- and
- combining the second IF signals to form a plurality of channels.
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;
- a second stage configured to receive the two first IF signals, the second stage configured to produce two second IF signals;
- and
- a third stage configured to compute two resulting frequencies based on a sum and a difference between the two second IF signals.
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;
- mixing and downconverting the first IF signals into second IF signals;
- combining the second IF signals to form a plurality of channels;
- and
- detecting the content of the sample based on the plurality of channels.
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;
- a second stage configured to receive the two first IF signals, the second stage configured to produce two second IF signals;
- 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 receiver combines the second IF signals to form a plurality of channels, and
- wherein the receiver detects the content of the sample based on the plurality of channels.
Dependencies are inferred from the claim text.