Biosensor with multi-channel A/D conversion and a method thereof

1. A biosensor with multi-channel A/D conversion, comprising:

a chip to generate a time-dependent analog signal in response to an enzyme reaction initiated by a specific component of a specimen making contact with the chip;

a multi-channel A/D converter with multiple channels each of which is configured to simultaneously receive the time-dependent analog signal in each sampling interval, the multi-channel A/D converter being configured to convert the time-dependent analog signal to a set of digital signals; and

a microprocessor to receive the set of digital signals in a sampling period and to determine the content of the specific component based on the set of digital signals.

2. The biosensor of claim 1 , wherein the time-dependent analog signal includes a response current.

3. The biosensor of claim 2 , further comprising a current/voltage converter to convert the time-dependent analog signal to a time dependent output voltage prior to sending to said multi-channel A/D converter.

4. The biosensor of claim 3 , wherein said current/voltage converter includes an operational converter.

5. The biosensor of claim 1 , wherein said multi-channel A/D converter includes a sampler, a multi-channel converter and a logic circuit.

6. The biosensor of claim 3 , wherein said multi-channel A/D converter includes a sampler, a multi-channel converter and a logic circuit.

7. The biosensor of claim 4 , wherein said multi-channel A/D converter includes a sampler, a multi-channel converter and a logic circuit.

8. The biosensor of claim 1 ,

wherein said microprocessor includes a mapping table of peak value versus content of the specific component, the peak value representing a maximum value of a time-dependent discharge curve constituted by the sets of digital signals collected during the sampling period; and

wherein said microprocessor is configured to determine the content of the specific component in accordance with the mapping table.

9. The biosensor of claim 3 ,

wherein said microprocessor includes a mapping table of peak value versus content of the specific component, the peak value representing a maximum value of a time-dependent discharge curve constituted by the set of digital signals collected during the sampling period; and

wherein said microprocessor is configured to determine the content of the specific component in accordance with the mapping table.

10. The biosensor of claim 1 ,

wherein said microprocessor includes a mapping table of rising time versus content of the specific component, the rising time corresponding to a maximum value of a time-dependent discharge curve constituted by the set of digital signals collected during the sampling period; and

wherein said microprocessor is configured to determine the content of the specific component in accordance with the mapping table.

11. The biosensor of claim 3 ,

wherein said microprocessor includes a mapping table of rising time versus content of the specific component, the rising time corresponding to a maximum value of a time-dependent discharge curve constituted by the set of digital signals collected during the sampling period; and

wherein said microprocessor is configured to determine the content of the specific component in accordance with the mapping table.

12. The biosensor of claim 1 , wherein further comprising a liquid crystal display to display a reading of the content of the specific component.

13. The biosensor of claim 3 , wherein further comprising a liquid crystal display to display a reading of the content of the specific component.

14. A method for determining a content of a specific component of a specimen, comprising:

generating a time-dependent analog signal in response to a content of a specific component of the specimen initiating an enzyme reaction on a chip of a biosensor;

simultaneously sending the time-dependent analog signal to each channel of a multi-channel A/D converter for converting to a set of digital signals during each sampling time;

sending the set of digital signals to a microprocessor; and

determining the content of the specific component in accordance with the set of digital signals collected during a sampling period.

15. The method of claim 14 , wherein the time-dependent analog signal is in a form of response current.

16. The method of claim 15 , further comprising converting the time-dependent analog signal to a time-dependent output voltage prior to converting to the set of digital signals.

17. The method of claim 14 , wherein further comprising establishing a time-dependent discharge curve in accordance with the set of digital signals collected during the sampling period.

18. The method of claim 17 , wherein the content of the specific component is determined in accordance with the time-dependent discharge curve and a mapping table of peak value versus content of the specific component, the peak value representing a maximum value of the time-dependent discharge curve.

19. The method of claim 17 , wherein the content of the specific component is determined in accordance with the time-dependent discharge curve and a mapping table of rising time versus content of the specific component, the rising time corresponding to a maximum value of the time-dependent discharge curve.

20. The method of claim 16 , wherein further comprising establishing a voltage-time discharge curve in accordance with the sets of digital signals collected during the sampling period.