System for signal mixing and method thereof

• US 7,139,330 B1
• Filed: 10/31/2001
• Issued: 11/21/2006
• Est. Priority Date: 10/31/2001
• Status: Expired due to Fees

• Current Assignee: VIXS Systems Incorporated (Pixelworks Incorporated)
• Original Assignee: VIXS Systems Incorporated (Pixelworks Incorporated)
• Inventors: May, Michael R.
• Primary Examiner(s): Pascal, Robert
• Assistant Examiner(s): FLANAGAN, KRISTA M
• Application Number:
  US09/999,540
• Time in Patent Office: 1,847 Days
• Field of Search: 375/261, 375/275, 375/295, 375/298, 375/316, 375/353, 375/354, 375/362, 375/340, 340/573, 343/741
• US Class Current: 375/316
• CPC Class Codes: H03D 7/00 Transference of modulation from one carrier to another, e.g. frequency-changing H03D9/00, H03D11/00 take precedence; dielectric amplifiers, magnetic amplifiers, parametric amplifiers used as a frequency-changers H03F
• CPC Class Codes: H04B 1/04 Circuits
• CPC Class Codes: H04B 1/30 for homodyne or synchrodyne receivers demodulator circuits H03D1/22

Abstract

A system and methods are provided for mixing input signal data values with values of a sinusoidal waveform. The sinusoidal waveform is normalized at a value greater than one and sampled to generate a fixed set of values for every period of the sinusoidal waveform. The fixed set of values is then converted to a plurality of bit-shift summation sets. The bit-shift summation sets are applied to the input signal by binary shifting the input signal data values. The binary shifts represent a mixing of the fixed set of values associated with the sinusoidal waveform and the input signal values.

Claims

1. A method comprising:

receiving data values associated with a signal waveform, wherein the data values represent the signal waveform at particular points in time;

representing sampled values of a sinusoidal waveform, normalized at a value other than one, as a plurality of bit-shift summation sets, wherein the sampled values represent the sinusoidal waveform at particular points in time; and

applying a particular bit shift summation set of the plurality of bit-shift accumulation sets to a particular data value of the data values associated with the signal waveform, wherein the particular bit-shift summation set and the particular data value correspond to a similar point in time.

2. The method as in claim 1, wherein the plurality of bit-shift summation sets represent the sinusoidal waveform using eight sets of data values within a period of the sinusoidal waveform.

3. The method as in claim 2, wherein the values include 17/16, ¾

, 0, −

¾

, and −

17/16.

4. The method as in claim 1, wherein the method is performed as part of operations within a monolithic semiconductor device.

5. The method as in claim 4, wherein the method is performed as part of in-phase mixing operations within the monolithic semiconductor device.

6. The method as in claim 4, wherein the method is performed as part of quadrature mixing operations within the monolithic semiconductor device.

7. The method as in claim 1, wherein a peak associated with the sinusoidal waveform is calculated using only one addition operation.

8. A method comprising:

identifying a set of points to represent a sinusoidal waveform, wherein the set of points include a maximum point and a zero point;

identifying a value, other than one, associated with the maximum point based on a midpoint, wherein the midpoint is a point of the set of points between the maximum point and the zero point; and

applying said value associated with the maximum point to an input data value using bit-shift summation.

9. The method as in claim 8, wherein the value associated with the maximum point is selected to allow bit-shift summation to be performed in place of values associated with points of the set of point;

wherein the bit-shift summation is used to represent the values associated with points of the sets of points within a level of accuracy.

10. The method as in claim 9, wherein an accuracy of bit-shit summation values compared to the values associated with points of the sets of points is greater than 45 decibels.

11. The method as in claim 8, wherein no more than two operands are used to represent a particular value associated with the points of the set of points.

12. The method as in claim 8, wherein the set of points include eight points for every period of the sinusoidal waveform.

13. The method as in claim 12, wherein adjacent points of the set of points are substantially equidistant.

14. The method as in claim 8, wherein a value of the maximum point is 17/16.

15. The method as in claim 8, further including applying the set of points to an array of data associated with a received signal waveform to generate an output waveform.

16. A system comprising:

an input port to receive input data values associated with an input signal waveform;

a bit-shift summation set including values associated with a sinusoidal waveform normalized at a value other than one;

a mixer to apply values from a bit-shift summation set to the input data values to generate a portion of a mixed signal waveform; and

an output port to provide data values associated with said mixed signal waveform.

17. The system as in claim 16, wherein said values associated with a sinusoidal waveform include eight values for every period of said sinusoidal waveform.

18. The system as in claim 17, wherein said values include 17/16, ¾

, 0, −

¾

, and −

17/16.

19. The system as in claim 16, wherein the value other than one includes 17/16.

20. The system as in claim 16, wherein the system is part of a monolithic semiconductor device.

21. The system as in claim 20, wherein the system forms part of in-phase mixing portions within the monolithic semiconductor device.

22. The system as in claim 20, wherein the system forms part of quadrature mixing portions within the monolithic semiconductor device.

23. The system as in claim 16, wherein said mixer includes binary shifters for applying bit-shifts to said input data values.