In-phase and quadrature sampling circuit
First Claim
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1. A circuit that provides samples of in-phase and quadrature components of an input waveform comprising:
- an oversampling ADC that receives the input waveform and converts the input waveform to digital samples having an input frequency at an oversampling rate;
a first digital decimation filter, coupled to the ADC, that receives the digital samples from the ADC and provides the in-phase component samples having a center frequency different from the input frequency; and
a second digital decimation filter, coupled to the ADC, that receives the digital samples from the ADC and provides the quadrature component samples having a center frequency different from the input frequency.
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Abstract
A circuit that provides samples of in-phase and quadrature components of an input waveform includes an oversampling ADC that receives the input waveform and converts the input waveform to digital samples at an oversampling rate. A first digital filter, coupled to the ADC, receives the digital samples from the ADC and provides the in-phase component samples of the input waveform. A second digital filter, coupled to the ADC, receives the digital samples from the ADC and provides the quadrature component samples of the input waveform.
67 Citations
16 Claims
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1. A circuit that provides samples of in-phase and quadrature components of an input waveform comprising:
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an oversampling ADC that receives the input waveform and converts the input waveform to digital samples having an input frequency at an oversampling rate; a first digital decimation filter, coupled to the ADC, that receives the digital samples from the ADC and provides the in-phase component samples having a center frequency different from the input frequency; and a second digital decimation filter, coupled to the ADC, that receives the digital samples from the ADC and provides the quadrature component samples having a center frequency different from the input frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for providing in-phase and quadrature component samples of an input waveform comprising the steps of:
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converting the input waveform to digital samples having an input frequency at an oversampling rate; with a first digital decimation filter, providing, from the digital samples, the in-phase component samples having a center frequency different from the input frequency; and with a second digital decimation filter, providing, from the digital samples, the quadrature component samples having a center frequency different from the input frequency. - View Dependent Claims (13, 14, 15)
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16. A circuit that provides in-phase and quadrature component samples of an input waveform comprising:
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means for converting the input waveform to digital samples having an input frequency at an oversampling rate; first decimation means, coupled directly to the means for converting, for providing from the digital samples the in-phase component samples having a center frequency different from the input frequency; and second decimation means, coupled directly to the means for converting, for providing from the digital samples the quadrature component samples having a center frequency different from the input frequency.
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Specification