Swept bandpass filter frequency modulated continuous wave (FMCW) receiver and related method
First Claim
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1. Receive path circuitry for a receiver configured to receive frequency modulated signals, comprising:
- a bandpass filter configured to receive an input signal having a frequency that varies over time within a frequency band, the bandpass filter having a bandwidth less than a bandwidth for the frequency band, having a center frequency that is sweepable across the frequency band and having a sweep control signal as an input that is configured to determine a location of the center frequency for the bandpass filter within the frequency band;
filter sweep control circuitry coupled to the bandpass filter to provide the sweep control signal, the filter sweep control circuitry being configured to control the sweep control signal to cause the center frequency of the bandpass filter to be swept across the frequency band to track the frequency of the input signal as it varies over time within the frequency band; and
an analog-to-digital converter (ADC) coupled to sample an output from the sweepable bandpass filter at a sampling frequency that is dependent upon a sampling clock input to the ADC.
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Abstract
A swept bandpass filter for receiving frequency varying input signals is disclosed. More particularly, a swept bandpass filter frequency modulated continuous wave (FMCW) receiver and related method are disclosed that provide an efficient solution for FMCW signals. The swept bandpass architecture eliminates the need for front-end mixing circuitry and allows for sampling across one or more Nyquist zones within the swept frequency band.
35 Citations
26 Claims
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1. Receive path circuitry for a receiver configured to receive frequency modulated signals, comprising:
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a bandpass filter configured to receive an input signal having a frequency that varies over time within a frequency band, the bandpass filter having a bandwidth less than a bandwidth for the frequency band, having a center frequency that is sweepable across the frequency band and having a sweep control signal as an input that is configured to determine a location of the center frequency for the bandpass filter within the frequency band; filter sweep control circuitry coupled to the bandpass filter to provide the sweep control signal, the filter sweep control circuitry being configured to control the sweep control signal to cause the center frequency of the bandpass filter to be swept across the frequency band to track the frequency of the input signal as it varies over time within the frequency band; and an analog-to-digital converter (ADC) coupled to sample an output from the sweepable bandpass filter at a sampling frequency that is dependent upon a sampling clock input to the ADC. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for receiving time-variant input signals, comprising:
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receiving a input signal having a frequency that varies over time within a frequency band; determining a location for the input signal frequency within the frequency band as a function of time; sweeping the center frequency of a sweepable bandpass filter across the frequency band based upon the frequency location of the input signal to track the frequency of the input signal as it varies over time within the frequency band, the sweepable bandpass filter having a bandwidth less than a bandwidth for the frequency band; filtering the input signal with the sweepable bandpass filter; and digitizing the filtered signal from the swept bandpass filter by sampling the output of the sweepable bandpass filter at a sampling frequency. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification