Method and system for a receiver with undersampling mixing using multiple clock phases
Methods and systems for a receiver with undersampling mixing using multiple clock phases are disclosed and may include undersampling a received wireless signal utilizing multiple undersamplers and clocking each of the undersamplers with a separate clock signal. Each of the clock signals may be at a sampling frequency but with a different phase angle. The difference of the phase angle between each of the clock signals may be adjusted and may be determined by the number of undersamplers. A gain ratio may be configured for two signals summed to generate each of the clock signals for the phase angle adjusting. The two signals may include in-phase and quadrature signals. Each of the summed signals may be normalized utilizing limiters. The sampling frequency may be an integer sub-harmonic of the received signal. The undersamplers may include track and hold or sample and hold circuits.
1. A method for wireless communication, the method comprising:
in a wireless receiver,
undersampling a received wireless signal utilizing three or more undersamplers;
clocking each of said three or more undersamplers with a separate clock signal, wherein each of said separate clock signals is at a sampling frequency but has equally spaced phase angles that are independent of the phase of the received wireless signal;
adjusting said equally spaced phase angles between each of said separate clock signals by configuring a gain ratio for two signals summed to generate each of said separate clock signals;
summing an output of each of said three or more undersamplers to produce a single signal having a frequency downconverted from a frequency of said received wireless signal.
2. A method, the method comprising:
in a wireless receiver,
undersampling a received wireless signal utilizing a plurality of undersamplers;
clocking each of said plurality of undersamplers with a separate clock signal, wherein each of said separate clock signals is at a sampling frequency but has equally spaced phase angles that are independent of the phase of the received wireless signal;
adjusting said equally spaced phase angles between each of said separate clock signals by configuring a gain ratio for two signals summed to generate each of said separate clock signals;
summing an output of each of said undersamplers to produce a single signal having a frequency downconverted from a frequency of said received wireless signal.
3. The method according to claim 2 , wherein said equally spaced phase angles between each of said separate clock signals is determined by a number of said plurality of undersamplers.
4. The method according to claim 1 , comprising normalizing each of said summed signals utilizing limiters.
5. The method according to claim 1 , wherein said sampling frequency is an integer sub-harmonic of said received wireless signal.
6. The method according to claim 1 , wherein said three or more undersamplers comprise track and hold circuits.
7. The method according to claim 1 , wherein said three or more undersamplers comprise sample and hold circuits.
8. The method according to claim 1 , comprising bandpass filtering signals generated by each of said three or more undersamplers.
9. A system for wireless communication, the system comprising:
one or more circuits in a wireless receiver that are configured to:
undersample a received wireless signal utilizing three or more undersamplers;
clock each of said three or more undersamplers with a separate clock signal, wherein each of said separate clock signals is at a sampling frequency but has equally spaced phase angles that are independent of the phase of the received wireless signal;
adjust said equally spaced phase angles between each of said separate clock signals by configuring a gain ratio for two signals summed to generate each of said separate clock signals;
sum an output of each of said three or more undersamplers to produce a single signal having a frequency downconverted from a frequency of said received wireless signal.
10. A system, the system comprising:
one or more circuits in a wireless receiver that are configured to:
undersample a received wireless signal utilizing a plurality of undersamplers;
clock each of said plurality of undersamplers with a separate clock signal, wherein each of said separate clock signals is at a sampling frequency but has equally spaced phase angles that are independent of the phase of the received wireless signal;
adjust said equally spaced phase angles between each of said separate clock signals by configuring a gain ratio for two signals summed to generate each of said separate clock signals;
sum an output of each of said plurality of undersamplers to produce a single signal having a frequency downconverted from a frequency of said received wireless signal.
11. The system according to claim 10 , wherein said equally spaced phase angles between each of said separate clock signals is determined by a number of said plurality of undersamplers.
12. The system according to claim 9 , wherein said sampling frequency is an integer sub-harmonic of said received wireless signal.
13. The system according to claim 9 , wherein said three or more undersamplers comprise track and hold circuits.
14. The system according to claim 9 , wherein said three or more undersamplers comprise sample and hold circuits.
15. The system according to claim 9 , wherein said one or more circuits are operable to bandpass filter signals generated by each of said three or more undersamplers.