DAC Variation-Tracking Calibration
AssigneeTaiwan Semiconductor Manufacturing Company, Ltd.
InventorsFang-Shi Jordan Lai, Kuo-Ming Wang, Hsu-Feng Hsueh, Cheng Yen Weng, Yung-Fu Lin
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Abstract
A method of calibrating a digital-to-analog converter (DAC) is provided. The DAC includes a least-significant bit (LSB) block, and dummy LSB block adjacent to the LSB block. The DAC has a most-significant bit (MSB) block, which includes MSB thermometer macros. The method includes measuring the dummy LSB block to obtain a dummy LSB sum; and calibrating the MSB block so that each of the MSB thermometer macros provides a substantially same current as the dummy LSB sum.
Claims20
A method of calibrating a digital-to-analog converter (DAC), the method comprising:
- providing the DAC comprising:
- a least-significant bit (LSB) block;
- a dummy LSB block adjacent to the LSB block;
- and
- a most-significant bit (MSB) block comprising MSB thermometer macros;
- measuring the dummy LSB block to obtain a first dummy LSB sum;
- and
- calibrating the MSB block so that each of the MSB thermometer macros provides a substantially same current as the first dummy LSB sum.
A method of calibrating a digital-to-analog converter (DAC), the method comprising:
- providing the DAC comprising:
- a least-significant bit (LSB) block;
- a dummy LSB block adjacent to the LSB block;
- and
- a most-significant bit (MSB) block comprising MSB thermometer macros;
- measuring the LSB block to obtain an LSB sum;
- measuring the dummy LSB block to obtain a first dummy LSB sum;
- calibrating the dummy LSB block so that a second dummy LSB sum of the dummy LSB block equals the LSB sum;
- calibrating the MSB block so that each of the MSB thermometer macros provides a substantially same current as the LSB sum;
- after the step of calibrating the MSB block, measuring the dummy LSB block to obtain a third dummy LSB sum;
- and
- calibrating the MSB block so that each of the MSB thermometer macros provides a substantially same current as the third dummy LSB sum.
A digital-to-analog converter (DAC) comprising:
- a least-significant bit (LSB) block;
- and
- a dummy LSB block adjacent to the LSB block, wherein a dummy LSB sum of the dummy LSB block is configurable.
Dependencies are inferred from the claim text.