Analog to digital converter using both analog and digital...

Details Analog to digital converter using both analog and digital... Analog to digital converter using both analog and digital...

2007-01-16

2007-01-16

Nguyen, Linh V. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S118000, C341S120000

Reexamination Certificate

active

11157556

ABSTRACT:
An A/D conversion unit includes an A/D converter, an analog offset canceller connected to the input end of the A/D converter, and a digital offset canceller connected to the output end of the A/D converter. The analog offset canceller performs a coarse adjustment of offset canceling voltage in the first stage of offset cancellation operation to largely cancel out the offset voltage involved in the A/D conversion unit by shifting the range of the input signal. Then the digital offset canceller performs a fine adjustment of offset canceling voltage in the second stage of offset cancellation operation to completely cancel out a residual offset voltage. Through the offset cancellation operation, the linearity error of the A/D converter, linearity error of the D/A converter, and matching error between the A/D and D/A converters are completely cancelled out.

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