Method and system for analog and digital RF receiver interface
View Patent ↗In a wireless device, a method and system for a baseband receiver interface including analog and digital components are provided. An analog or a digital interface may be selected for a I/Q data signal received from a front-end receiver. The analog interface may be a conventional RF or a VLIF interface. The I/Q data signal may be digitized when received from the analog interface and saturation detection may be used during digitization of the I/Q data signal. When the analog interface is the VLIF interface, a derotator may be used to remove the VLIF frequency. The derotator may be based on a CORDIC algorithm. The I/Q data signal may be converted from serial to parallel format when received from the digital interface. The received I/Q data signal may be decimated before transferred to a baseband processor.
1. A method for processing baseband signals, the method comprising:
performing in one or more processors and/or circuits, functions comprising:
selecting between an analog interface and a digital interface to receive an I/Q data signal from a front-end receiver; and
decimating said received I/Q data signal before it is transferred to a baseband processor.
2. The method according to claim 1 , comprising selecting said analog interface from a conventional analog interface or a VLIF analog interface.
3. The method according to claim 1 , comprising digitizing said I/Q data signal when received from said analog interface.
4. The method according to claim 3 , comprising detecting saturation in said digitization of said received I/Q data signal when a determined average value is greater than a threshold value.
5. The method according to claim 1 , comprising removing a VLIF frequency when said selected analog interface is a VLIF analog interface.
6. The method according to claim 5 , comprising removing said VLIF frequency utilizing a derotation function based on a CORDIC algorithm.
7. The method according to claim 5 , comprising programming said VLIF frequency.
8. The method according to claim 5 , comprising determining a phase and a phase increment for removing said VLIF frequency.
9. The method according to claim 5 , comprising normalizing a phase to a first Cartesian field and assigning a sign value.
10. The method according to claim 5 , comprising normalizing a plurality of output parameters.
11. The method according to claim 5 , comprising assigning to a plurality of outputs corresponding output parameters based on a sign value.
12. The method according to claim 1 , comprising converting said I/Q data signal from a digital serial format to a digital parallel format when said selected interface is a digital interface.
13. A system for processing baseband signals, the system comprising:
one or more processors that are operable to select between an analog interface and a digital interface to receive an I/Q data signal from a front-end receiver; and
a baseband receiver interface that is operable to decimate said received I/Q data signal before it is transferred to a baseband processor.
14. The system according to claim 13 , wherein said one or more processors are operable to select said analog interface from a conventional analog interface or a VLIF analog interface.
15. The system according to claim 13 , wherein an ADC in said baseband receiver interface is operable to digitize said I/Q data signal when received from said analog interface.
16. The system according to claim 15 , wherein a saturation detector in said baseband receiver interface is operable to detect saturation in said digitization of said received I/Q data signal when a determined average value is greater than a threshold value.
17. The system according to claim 13 , wherein a derotator in said baseband receiver interface is operable to remove a VLIF frequency when said selected analog interface is a VLIF analog interface.
18. The system according to claim 17 , wherein said derotator is operable to remove said VLIF frequency based on a CORDIC algorithm.
19. The system according to claim 17 , wherein said one or more processors are operable to program said VLIF frequency into a memory.
20. The system according to claim 17 , wherein said one or more processors are operable to determine a phase and a phase increment for removing said VLIF frequency.
21. The system according to claim 17 , wherein one or more processors are operable to normalize a phase to a first Cartesian field and assigns a sign value.
22. The system according to claim 17 , wherein said derotator is operable to normalize a plurality of output parameters.
23. The system according to claim 17 , wherein said derotator is operable to assign to a plurality of outputs corresponding output parameters based on a sign value.
24. The system according to claim 13 , wherein a serial-to-parallel converter is operable to convert said I/Q data signal from a digital serial format to a digital parallel format when said selected interface is a digital interface.
25. A baseband receiver interface for processing baseband signals, said baseband receiver interface comprising:
an analog filter coupled to an ADC;
said ADC coupled to a saturation detector and to a first decimator;
said first decimator coupled to a second decimator;
said second decimator coupled to a derotator and a first multiplexer;
said derotator coupled to a VLIF source and said first multiplexer;
said first multiplexer coupled to a third decimator;
said third decimator coupled to a second multiplexer;
a serial-to-parallel converter coupled to said second multiplexer; and
said second multiplexer coupled to a fourth decimator.