Analog-to-digital converting module for related light sensing device
First Claim
1. An analog-to-digital module, comprising:
- a sampling unit, for generating an output voltage between a positive output end and a negative output end according to a positive input voltage of a positive input end and a negative input voltage of a negative input end;
a comparing unit, for generating a digital output signal according to magnitude relationship between the output voltage and a reference voltage;
a variable current source, for generating a variable current according to the digital output signal at the negative input end in a first period according to a control signal;
a measured current source, for generating a measured current at the negative input end; and
an adjusting unit, for adjusting the output voltage according to the digital output signal in a second period according to the control signal;
wherein the first period does not overlap the second period.
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Abstract
An analog-to-digital module includes a sampling unit, for generating an output voltage between a positive output end and a negative output end according to a positive input voltage of a positive input end and a negative input voltage of a negative input end; a comparing unit, for generating a digital output signal according to magnitude relationship between the output voltage and a reference voltage; a variable current source, for generating a variable current according to the digital output signal at the negative input end in a first period according to a control signal; a measured current source, for generating a measured current at the negative input end; and an adjusting unit, for adjusting the output voltage according to the digital output signal in a second period according to the control signal; wherein the first period does not overlap the second period.
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Citations
16 Claims
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1. An analog-to-digital module, comprising:
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a sampling unit, for generating an output voltage between a positive output end and a negative output end according to a positive input voltage of a positive input end and a negative input voltage of a negative input end; a comparing unit, for generating a digital output signal according to magnitude relationship between the output voltage and a reference voltage; a variable current source, for generating a variable current according to the digital output signal at the negative input end in a first period according to a control signal; a measured current source, for generating a measured current at the negative input end; and an adjusting unit, for adjusting the output voltage according to the digital output signal in a second period according to the control signal; wherein the first period does not overlap the second period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A sensing device, comprising:
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a light emitting module, for generate light of a predefined frequency range according to temperature sensing information; an analog-to-digital converting module, comprising; a sampling unit, for generating an output voltage between a positive output end and a negative output end according to a positive input voltage of a positive input end and a negative input voltage of a negative input end; a comparing unit, for generating a digital output signal according to magnitude relationship between the output voltage and a reference voltage; a variable current source, for generating a variable current according to the digital output signal at the negative input end in a first period according to a control signal; an adjusting unit, for adjusting the output voltage according to the digital output signal in a second period according to the control signal; a sensing unit, for sensing the light of the predefined frequency range to generate a sensing current; a temperature sensing unit, for generating a temperature sensing current proportional to the absolute temperature; and a switch unit, for conducting a connection between the temperature sensing unit and the negative input end in the first period and conducting another connection between the sensing unit and the negative input end in the second period; and a process unit, for generating the control signal, generating the temperature sensing information according to the digital output signal in the first period, and generating a light sensing information according to the digital output signal in the second period; wherein the first period does not overlap the second period. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification