Method and system for broadband analog to digital converter technology
View Patent ↗Methods and systems are provided for calibrating nonlinearity correction during analog-to-digital conversions on received analog signals. Correction-parameters may be estimated, such as to reduce, when applied to total spectral content, distortion resulting from the 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 correction calibration may be performed during reception and handling of the 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 a device that performs analog-to-digital conversion:
determining when nonlinearity is exhibited during analog-to-digital conversion of received analog signals;
when nonlinearity is exhibited, generating correction estimation parameters associated with the received analog signals, wherein applying the correction estimation parameters to total spectral content reduces distortion in originally-unoccupied spectral regions, the distortion resulting from the nonlinearity; and
correcting based on the correction estimation parameters, digital signals generated based on sampling of the received analog signals.
2. The method according to claim 1 , comprising calibrating nonlinearity correction in the device during reception and handling of the analog signals.
3. The method according to claim 1 , comprising generating the correction estimation parameters based on signals in particular spectral regions.
4. The method according to claim 3 , wherein the particular spectral regions correspond to the originally-unoccupied spectral regions.
5. The method according to claim 3 , comprising injecting specific signals in the particular spectral regions.
6. The method according to claim 5 , comprising generating the correction estimation parameters based on the injected specific signals.
7. The method according to claim 3 , comprising isolating signals located in the particular spectral regions, wherein the correction estimation parameters are generated based on the isolated signals.
8. The method according to claim 7 , comprising isolating the signals located in the particular spectral regions after the correcting of the digital signals.
9. A system, comprising:
one or more circuits for use in the system that performs analog-to-digital conversion, the one or more circuits being operable to:
determine when nonlinearity is exhibited during analog-to-digital conversion of received analog signals;
generate correction estimation parameters, wherein applying the correction estimation parameters to total spectral content reduces distortion in originally-unoccupied spectral regions, the distortion resulting from the nonlinearity; and
correct based on the correction estimation parameters, digital signals generated based on sampling of the received analog signals.
10. The system according to claim 9 , wherein the one or more circuits are operable to calibrate nonlinearity correction in the system during reception and handling of the analog signals.
11. The system according to claim 9 , wherein the one or more circuits are operable to generate the correction estimation parameters based on signals in particular spectral regions.
12. The system according to claim 11 , wherein the particular spectral regions correspond to the originally-unoccupied spectral regions.
13. The system according to claim 11 , wherein the one or more circuits are operable to inject specific signals in the particular spectral regions.
14. The system according to claim 13 , wherein the one or more circuits are operable to generate the correction estimation parameters based on the injected specific signals.
15. The system according to claim 11 , wherein the one or more circuits are operable to isolate signals located in the particular spectral regions, and the correction estimation parameters are generated based on the isolated signals.
16. The system according to claim 15 , wherein the one or more circuits are operable to isolate the signals located in the particular spectral regions after the correcting of the digital signals.
17. A system, comprising:
one or more circuits for use in a sampling component, the one or more circuits being operable to:
determine when a first band of a multiband signal is self-aliased during sampling of a second band of the multiband signal;
when self-aliasing occurs, generate a plurality of components corresponding to the first band based on sampling of the first band and sampling of the second band; and
combine the plurality of components to reconstruct the first band.
18. The system according to claim 17 , wherein the one or more circuits are operable to disable operation of the sampling component when sampling of the second band does not cause self-aliasing of the first band.
19. The system according to claim 17 , wherein the one or more circuits are operable to high-pass filter and then decimate an output of analog-to-digital conversion of the sampling of the second band, to generate a first one of the plurality of components.
20. The system according to claim 19 , wherein the one or more circuits are operable to:
low-pass filter and then re-sample an output of an analog-to-digital conversion of the sampling of the second band; and
subtract the low-pass filtered and re-sampled output of an analog-to-digital conversion of the sampling of the first band, to generate a second one of the plurality of components.