Method and system for broadband analog to digital converter technology
Nonlinearity correction in a device that performs analog-to-digital conversion on received analog signals, may be calibrated by generating correction-parameters estimation which when applied to the total spectral content reduces distortion resulting from said nonlinearity in originally-unoccupied spectral regions. Digital signals generated based on sampling of the received analog signals may then be corrected, to remove nonlinearity related distortion, based on the estimated correction-parameters. The nonlinearity calibration may be performed during reception and handling of said analog signals. The correction-parameters may be generated based on signals located in particular spectral regions, such as the originally-unoccupied spectral regions. These signals may be injected within the device, into the particular spectral regions, and the signal may have known characteristics to enable estimating the required correction.
1. A method, comprising:
in an electronic device that performs analog-to-digital conversion:
generating a distorted digital signal by sampling an output from a non-linear analog frontend;
generating a corrected digital signal by applying a compensation signal to said distorted digital signal; and
generating said compensation signal according to a non-linearity estimation and a spectral analysis of said corrected digital signal.
2. The method according to claim 1 , comprising generating said distorted digital signal, said corrected digital signal, and said compensation signal during reception and handling of analog signals.
3. The method according to claim 1 , comprising generating said compensation signal based on particular spectral regions.
4. The method according to claim 3 , wherein said particular spectral regions correspond to originally-unoccupied spectral regions.
5. The method according to claim 3 , wherein generating said compensation signal comprises injecting specific signals in said particular spectral regions.
6. The method according to claim 5 , comprising generating said compensation signal based on said injected specific signals.
7. The method according to claim 3 , wherein generating said compensation signal comprises isolating signals located in said particular spectral regions, and wherein said compensation signal is generated based on said isolated signals.
8. The method according to claim 7 , comprising isolating said signals located in said particular spectral regions after generating said corrected digital signal.
9. A system, comprising:
an analog-to-digital converter that generates a distorted digital signal by sampling an output from a non-linear analog frontend;
a digital corrector that generates a corrected digital signal applying a compensation signal to said distorted digital signal; and
a correction estimator that generates said compensation signal according to a non-linearity estimation and a spectral analysis of said corrected digital signal.
10. The system according to claim 9 , wherein said analog-to-digital converter, said digital corrector, and said correction estimator generate said distorted digital signal, said corrected digital signal, and said compensation signal during reception and handling of analog signals.
11. The system according to claim 9 , wherein said correction estimator generates said compensation signal based on signals in particular spectral regions.
12. The system according to claim 11 , wherein said correction estimator generates said compensation signal based on signals in originally-unoccupied spectral regions.
13. The system according to claim 11 , comprising a compensation signal generator that injects specific signals in said particular spectral regions.
14. The system according to claim 13 , wherein said correction estimator generates said compensation signal based on said injected specific signals.
15. The system according to claim 11 , comprising a signal isolator that isolates signals located in said particular spectral regions, and wherein said correction estimator generates said compensation signal based on said isolated signals.
16. The system according to claim 15 , wherein said signal isolator isolates said signals located in said particular spectral regions after said digital corrector generated said corrected digital signal.