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10/26/06 - USPTO Class 341 | 199 views | #20060238395 | Prev - Next | About this Page

Complex type sigma-delta analog to digital conversion unit and receiver

Title: Complex type sigma-delta analog to digital conversion unit and receiver

Brief Patent Description - Full Patent Description - Patent Claims

The Patent Description & Claims data below is from USPTO Patent Application 20060238395, Complex type sigma-delta analog to digital conversion unit and receiver.

1. A complex type sigma-delta analog to digital conversion unit, comprising: a first subtractor for carrying out subtraction by inputting a first input signal and a first feedback signal; a first filter for filtering an output signal of the first subtractor; a first analog to digital converter for converting an output signal of the first filter into a digital format from an analog format; a first digital to analog converter which converts an output signal of the first analog to digital converter into an analog format from a digital format and outputs the converted signal to the first subtractor as the first feedback signal; a second subtractor for carrying out subtraction by inputting a second input signal and a second feedback signal, the second input signal being orthogonal to the first input signal; a second filter for filtering an output signal of the second subtractor; a second analog to digital converter for converting an output signal of the second filter into a digital format from an analog format; a second digital to analog converter which converts an output signal of the second analog to digital converter into an analog format from a digital format and outputs the converted signal to the second subtractor as the second feedback signal; a first sign controller which inverts a positive/negative sign of the output signal of the first filter in response to a control signal and outputs it to the second filter; and a second sign controller which inverts a positive/negative sign of the output signal of the second filter in response to the control signal and outputs it to the first filter.

2. The complex type sigma-delta analog to digital conversion unit according to claim 1, wherein: when the control signal is in a first state, the first sign controller maintains the positive/negative sign of the output signal of the first filter and outputs it to the second filter, and the second sign controller inverts the positive/negative sign of the output signal of the second filter and outputs it to the first filter; and when the control signal is in a second state, the first sign controller inverts the positive/negative sign of the output signal of the first filter and outputs it to the second filter, and the second sign controller maintains the positive/negative sign of the output signal of the second filter and outputs it to the first filter.

3. The complex type sigma-delta analog to digital conversion unit according to claim 1, wherein the first and second filters are RC active filters, respectively.

4. The complex type sigma-delta analog to digital conversion unit according to claim 1, wherein the first and second filters are gm-C filters, respectively.

5. The complex type sigma-delta analog to digital conversion unit according to claim 1, wherein the first and second filters are switched capacitor filters, respectively.

6. The complex type sigma-delta analog to digital conversion unit according to claim 1, wherein the first and second sign controllers amplify the output signals of the first and second filters by a factor of a constant, respectively.

7. The complex type sigma-delta analog to digital conversion unit according to claim 1, wherein in the first and second filters, the input signal and the output signal are differential signals, respectively.

8. The complex type sigma-delta analog to digital conversion unit according to claim 7, wherein the first and second sign controllers make the lines of the output differential signals of the first and second filters straight or cross in response to the control signal and couple them with the second and first filters, respectively.

9. The complex type sigma-delta analog to digital conversion unit according to claim 1, further comprising an operation section for outputting the control signal in response to an operation.

10. A receiver comprising: the complex type sigma-delta analog to digital conversion unit according to claim 1; and a mixer for mixing an input signal, thereby to generate first and second input signals that are orthogonal to each other.

11. The receiver according to claim 10, wherein: when the control signal is in a first state, the first sign controller maintains the positive/negative sign of the output signal of the first filter and outputs it to the second filter, and the second sign controller inverts the positive/negative sign of the output signal of the second filter and outputs it to the first filter; and when the control signal is in a second state, the first sign controller inverts the positive/negative sign of the output signal of the first filter and outputs it to the second filter, and the second sign controller maintains the positive/negative sign of the output of the second filter and outputs it to the first filter.

12. The receiver according to claim 10, wherein the first and second filters are RC active filters, respectively.

13. The receiver according to claim 10, wherein the first and second filters are gm-C filters, respectively.

14. The receiver according to claim 10, wherein the first and second filters are switched capacitor filters, respectively.

15. The receiver according to claim 10, wherein the first and second sign controllers amplify the first and second filters by a factor of a constant, respectively.

16. The receiver according to claim 10, wherein in the first and second filters, the input signal and the output signal are differential signals, respectively.

17. The receiver according to claim 16, wherein the first and second sign controllers make the lines of the output differential signals of the first and second filters straight or cross in response to the control signal and couple them with the second and first filters, respectively.

18. The receiver according to claim 10, further comprising an operation section for outputting the control signal in response to an operation.

Brief Patent Description - Full Patent Description - Patent Claims

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Previous Patent Application:
Test apparatus and test method for mixed-signal semiconductor components
Next Patent Application:
Method and apparatus for creating phase modulation in edge-sensitive signals
Industry Class:
Coded data generation or conversion

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