Analog-to-information conversion using analog pre-processing sensing of multi-band signals
Analog-to-information converter and method for performing analog-to-information conversion samples and down-converts N samples of an input multi-band signal using M analog sampling filters or samplers, where N is less than M. The N samples of the input multi-band signal are digitized to produce N digital samples of the input multi-band signal, which are multiplexed into M digital samples of the input multi-band signal. The M digital samples are up-converted and filtered at M digital reconstruction filters to produce a digital multi-band signal, which is processed at a processing unit to obtain information contained in the digital multi-band signal.
1. A method for performing analog-to-information conversion for multi-band signals, the method comprising:
receiving an input multi-band signal at M analog sampling filters;
sampling and down-converting N samples of the input multi-band signal at selected N analog sampling filters of the M analog sampling filters, where N is less than M;
digitizing the N samples of the input multi-band signal to produce N digital samples of the input multi-band signal;
multiplexing the N digital samples of the input multi-band signal into M digital samples of the input multi-band signal;
up-converting and filtering the M digital samples of the input multi-band signal at M digital reconstruction filters to produce a digital multi-band signal; and
processing the digital multi-band signal at a processing unit to obtain information contained in the digital multi-band signal.
2. The method of claim 1 , further comprising analyzing the digital multi-band signal to determine frequency channels that are not part of any signal bands for the input multi-band signal and selectively excluding the frequency channels for sampling and down-converting N samples of the input multi-band signal.
3. The method of claim 2 , wherein analyzing the digital multi-band signal includes using short time Fourier transform on the digital multi-band signal to determine the frequency channels that are not part of any signal bands for the input multi-band signal.
4. The method of claim 1 , wherein sampling and down-converting the N samples of the input multi-band signal and up-converting and filtering the M digital samples of the input multi-band signal are part of a minimum rate sampling and reconstruction algorithm.
5. The method of claim 1 , wherein each of the M analog sampling filters is configured to delay a particular sample and the M digital reconstruction filters are configured to remove the delay and synchronize the M digital samples to produce the digital multi-band signal.
6. The method of claim 1 , wherein digitizing the N samples of the input multi-band signal includes digitizing the N samples of the input multi-band signal using less than M analog-to-digital converters.
7. The method of claim 1 , wherein each of the M analog sampling filters includes a bootstrapped switch with a pair of capacitors to produce a delayed sample for a particular channel and an altering signal for a channel adjacent to the particular channel.
8. The method of claim 7 , further comprising controlling the altering signal using a resistive ladder effect on an output terminal connected to one of the capacitors.
9. An analog-to-information converter for multi-band signals comprising:
M analog sampling filters connected to an input terminal to receive an input multi-band signal, the M analog sampling filters being controlled to sample and down-convert N samples of the input multi-band signal at selected N analog sampling filters of the M analog sampling filters, where N is less than M;
a plurality of analog-to-digital converters connected to the M analog sampling filters to digitize the N samples of the input multi-band signal to produce N digital samples of the input multi-band signal;
a digital N:M multiplexer connected to the analog-to-digital converters to multiplex the N digital samples of the input multi-band signal into M digital samples of the input multi-band signal;
M digital reconstruction filters connected to the digital N:M multiplexer to up-convert and filter the M digital samples of the input multi-band signal to produce a digital multi-band signal; and
a processing unit coupled to the M digital reconstruction filters to process the digital multi-band signal to obtain information contained in the digital multi-band signal.
10. The analog-to-information converter of claim 9 , wherein the processing unit is configured to analyze the digital multi-band signal to determine frequency channels that are not part of any signal bands for the input multi-band signal and selectively exclude the frequency channels to sample and down-convert the N samples of the input multi-band signal.
11. The analog-to-information converter of claim 10 , wherein the processing unit is configured to use short time Fourier transform on the digital multi-band signal to determine the frequency channels that are not part of any signal bands for the input multi-band signal.
12. The analog-to-information converter of claim 9 , wherein the M analog sampling filters and the M digital reconstruction filters operate to execute a minimum rate sampling and reconstruction algorithm.
13. The analog-to-information converter of claim 9 , wherein each of the M analog sampling filters is configured to delay a particular sample and the M digital reconstruction filters are configured to remove the delay and synchronize the M digital samples to produce the digital multi-band signal.
14. The analog-to-information converter of claim 9 , wherein the plurality of analog-to-digital converters includes less than M analog-to-digital converters.
15. The analog-to-information converter of claim 9 , wherein each of the M analog sampling filters includes a bootstrapped switch with a pair of capacitors to produce a delayed sample for a particular channel and an altering signal for a channel adjacent to the particular channel.
16. The analog-to-information converter of claim 15 , wherein the bootstrapped switch includes transistors connected in series to produce a resistive ladder effect on an output terminal connected to one of the capacitors to control the altering signal.
17. The analog-to-information converter of claim 9 , wherein each of the M samplers is configured to delay a particular sample and the processing unit is configured to remove the delay and synchronize the M digital samples to produce the digital multi-band signal.
18. An analog-to-information converter for multi-band signals comprising:
M samplers connected to an input terminal to receive an input multi-band signal, the M samplers being controlled to sample and down-convert N samples of the input multi-band signal, where N is less than M;
a plurality of analog-to-digital converters connected to the M samplers to digitize the N samples of the input multi-band signal to produce N digital samples of the input multi-band signal;
a digital N:M multiplexer connected to the analog-to-digital converters to multiplex the N digital samples of the input multi-band signal into M digital samples of the input multi-band signal; and
a processing unit connected to the digital N:M multiplexer, the processing unit configured to up-convert and filter the M digital samples of the input multi-band signal to produce a digital multi-band signal and to process the digital multi-band signal to obtain information contained in the digital multi-band signal.
19. The analog-to-information converter of claim 18 , wherein the processing unit is configured to analyze the digital multi-band signal to determine frequency channels that are not part of any signal bands for the input multi-band signal and selectively exclude the frequency channels to sample and down-convert the N samples of the input multi-band signal.
20. The analog-to-information converter of claim 18 , wherein the M samplers and the processing unit operate to execute a minimum rate sampling and reconstruction algorithm.