Method and system for synthetically sampling input signal
First Claim
1. A system for synthetically sampling an input signal to provide a sampled signal, the system comprising:
- a sample clock configured to generate a sampling signal having a sampling frequency; and
a mixer configured to receive the sampling signal and the input signal, and to output an intermediate frequency (IF) signal having a first harmonic image by mixing the sampling signal and the input signal, wherein an offset voltage is introduced into the mixer with the sampling signal to add a baseband image to the first harmonic image, the offset voltage being adjusted so that the baseband image of the IF signal has the same magnitude as the first harmonic image of the IF signal.
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Abstract
A system for synthetically sampling an input signal to provide a sampled signal includes a sample clock and a mixer. The sample clock is configured to generate a sampling signal having a sampling frequency. The mixer is configured to receive the sampling signal and the input signal, and to output an intermediate frequency (IF) signal by mixing the sampling signal and the input signal. An offset voltage is introduced into the mixer with the sampling signal to provide a baseband image, the offset voltage being adjusted so that the baseband image of the IF signal has the same magnitude as a first harmonic image of the IF signal.
21 Citations
20 Claims
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1. A system for synthetically sampling an input signal to provide a sampled signal, the system comprising:
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a sample clock configured to generate a sampling signal having a sampling frequency; and a mixer configured to receive the sampling signal and the input signal, and to output an intermediate frequency (IF) signal having a first harmonic image by mixing the sampling signal and the input signal, wherein an offset voltage is introduced into the mixer with the sampling signal to add a baseband image to the first harmonic image, the offset voltage being adjusted so that the baseband image of the IF signal has the same magnitude as the first harmonic image of the IF signal. - View Dependent Claims (2, 3, 4, 5, 19)
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6. A system for synthetically sampling an input signal to provide a sampled signal, the system comprising:
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a sample clock configured to generate an sampling signal having a sampling frequency; a splitter configured to split the input signal into a first split input signal and a second split input signal; a mixer configured to receive the sampling signal and the first split input signal, and to output an intermediate frequency (IF) signal having an intermediate frequency by mixing the sampling signal and the first split input signal, the IF signal comprising a first harmonic image; and a combiner configured to sum the IF signal output by the mixer and the second split input signal having a baseband image output by the splitter, and to output a combined IF signal at the intermediate frequency, wherein a magnitude of at least one of the IF signal and the second split input signal is adjusted, so that a magnitude of the baseband image provided by the second split input signal matches a magnitude of the first harmonic image provided by the IF signal in the combined IF signal output by the combiner. - View Dependent Claims (7, 8, 9, 10, 11, 12, 20)
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13. A method of synthetically sampling a radio frequency (RF) input signal to provide a sampled signal, the method comprising:
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receiving the RF input signal and a sampling signal having a sampling frequency; mixing at least a portion of the RF input signal and the sampling signal and adding a baseband image to provide an intermediate frequency (IF) signal having a first harmonic image and the baseband image; and adjusting a magnitude of at least one of the first harmonic image and the baseband image so that the magnitude of the first harmonic image matches the magnitude of the baseband image. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification