Broadband superhetrodyne receiver with agile intermediate frequency for interference mitigation
First Claim
1. A broadband superheterodyne receiver, comprising:
- an input for receiving an RF signal including an RF data signal at a carrier frequency;
an RF mixer coupled to the input, to shift the RF data signal from the carrier frequency to an IF frequency;
an IF band pass filter coupled to the mixer, wherein the band pass filter has a pass band, to band pass filter the signal near the IF frequency;
a spectrum analyzer to provide information representative of the spectral characteristics of the received RF signal around the RF data signal at the carrier frequency; and
an IF controller coupled to the RF mixer and to the spectrum analyzer, to;
(1) determine an interference-mitigating IF frequency within the pass band of the band pass filter that will result in attenuation of undesired portions of the RF signal, and (2) control the RF mixer to shift the RF data signal to the interference-mitigating IF frequency.
1 Assignment
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Accused Products
Abstract
A broadband superheterodyne receiver. Embodiments include an input for receiving an RF signal including an RF data signal at a carrier frequency. An RF mixer coupled to the input shifts the RF data signal from the carrier frequency to an IF frequency. An IF band pass filter coupled to the mixer has a pass band, and band pass filters the signal near the IF frequency. A spectrum analyzer provides information representative of the spectral characteristics of the received RF signal around the RF data signal at the carrier frequency. An IF controller is coupled to the RF mixer and to the spectrum analyzer. The IF controller: (1) determines an interference-mitigating IF frequency within the pass band of the band pass filter that will result in attenuation of undesired portions of the RF signal, and (2) controls the RF mixer to shift the RF data signal to the interference-mitigating IF frequency.
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Citations
14 Claims
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1. A broadband superheterodyne receiver, comprising:
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an input for receiving an RF signal including an RF data signal at a carrier frequency; an RF mixer coupled to the input, to shift the RF data signal from the carrier frequency to an IF frequency; an IF band pass filter coupled to the mixer, wherein the band pass filter has a pass band, to band pass filter the signal near the IF frequency; a spectrum analyzer to provide information representative of the spectral characteristics of the received RF signal around the RF data signal at the carrier frequency; and an IF controller coupled to the RF mixer and to the spectrum analyzer, to;
(1) determine an interference-mitigating IF frequency within the pass band of the band pass filter that will result in attenuation of undesired portions of the RF signal, and (2) control the RF mixer to shift the RF data signal to the interference-mitigating IF frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for mitigating interference in a superheterodyne receiver, including:
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band pass filtering a received signal at an IF stage; and operating an RF mixer to shift the received signal to a determined interference-mitigating intermediate frequency in such a manner as to cause undesired portions of the received signal to be attenuated by the band pass filtering while passing desired portions of the received signal. - View Dependent Claims (11, 12, 13, 14)
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Specification