Method and system for bit polarization coding

• US 20090243905A1
• Filed: 03/31/2008
• Published: 10/01/2009
• Est. Priority Date: 03/31/2008
• Status: Active Grant

• Current Assignee: Analog Devices International Unlimited Company (Analog Devices, Inc.)
• Original Assignee: Linear Technology Corporation (Analog Devices, Inc.)
• Inventors: Redmayne, Derek, Reay, Richard James
• Granted Patent: US 7,656,337 B2
• Time in Patent Office: Days
• US Class Current: 341/144
• CPC Class Codes: H03M 1/0863 of switching transients, e.g. glitches
• CPC Class Codes: H03M 7/04 the radix thereof being two
• CPC Class Codes: H03M 7/14 Conversion to or from non-weighted codes
• CPC Class Codes: H04L 25/4915 using pattern inversion or substitution H04L25/4908 takes precedence

Abstract

A method and system for converting a digital code. A digital signal is encoded to have a digital code having multiple binary bits. Substantially one half of the binary bits of the digital code is inverted to produce a modified digital code to reduce digital noise associated with the digital code.

Claims

1. A method for converting an analog signal to a digital signal, comprising:

receiving an analog signal;

measuring a voltage of the analog signal with respect to a sampling point;

selecting, based on the voltage measured, a digital code comprising a plurality of binary bits;

inverting substantially one half of the plurality of binary bits of the digital code without consideration of the state of the binary bits to produce a modified digital code to represent the analog signal at the sampling point.

2. The method of claim 1, wherein the one half of the plurality of binary bits comprises alternate bits of the binary bits.

3. The method of claim 1, wherein the one half of the plurality of binary bits comprises a first half of the binary bits.

4. The method of claim 1, wherein the one half of the plurality of binary bits comprises a second half of the binary bits.

5. The method of claim 1, where the one half of the plurality of binary bits corresponds to consecutive binary bits.

6. (canceled)

7. A method for converting a digital signal to an analog signal, comprising:

receiving a digital signal encoded to have a digital code comprising a plurality of binary bits;

inverting substantially one half of the plurality of binary bits without consideration of the state of the binary bits to produced a modified digital code;

determining a voltage of the analog signal at a sampling point represented by the modified digital code.

8. The method of claim 7, wherein the one half of the plurality of binary bits comprises alternate bits of the binary bits.

9. The method of claim 7, wherein the one half of the plurality of binary bits comprises a first half of the binary bits.

10. The method of claim 7, wherein the one half of the plurality of binary bits comprises a second half of the binary bits.

11. The method of claim 7, where the one half of the plurality of binary bits corresponds to consecutive binary bits.

12. (canceled)

13. An electronic circuit including an A/D converter, comprising:

a circuit, configured for carrying out a function and having a portion thereof capable of converting an analog signal to a digital signal, wherein the portion converting an analog signal to a digital signal comprises;

a receiving portion capable of receiving an analog signal;

a measuring portion capable of determining a voltage of the analog signal with respect to a sampling point;

a conversion portion capable of selecting, based on the voltage of the analog signal, a digital code comprising a plurality of binary bits;

an inversion portion capable of inverting substantially one half of the plurality of binary bits of the digital code to produced a modified digital code to digitally represent the analog signal at the sampling point without consideration of the state of the binary bits.

14. An electronic circuit including a D/A converter, comprising:

a circuit, configured for carrying out a function and having a portion thereof capable of converting a digital signal to an analog signal, wherein the portion converting a digital signal to an analog signal comprises;

a portion capable of receiving a digital code comprising a plurality of binary bits;

an inversion portion capable of inverting substantially one half of the plurality of binary bits to produced a modified digital code that represents the analog signal at a sample point without consideration of the state of the binary bits;

a conversion portion capable of determining a voltage of the analog signal at the sampling point represented by the modified digital code.

15. A method for reducing digital noise, comprising:

receiving a digital signal encoded to have a digital code comprising a plurality of binary bits;

inverting substantially one half of the plurality of binary bits of the digital code without consideration of the state of the binary bits to produce a modified digital code to reduce digital noise associated with the digital code.

16. A method for reducing digital noise, comprising:

receiving a digital signal encoded to reduce digital noise associated with a corresponding digital code, wherein the digital signal includes a plurality of binary bits;

inverting substantially one half of the plurality of binary bits of the digital signal without consideration of the state of the binary bits to recover the corresponding digital code.