US9065467B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9065467-B2 |
| Application number | US-201414458406-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 13, 2014 |
| Priority date | Apr 22, 2011 |
| Publication date | Jun 23, 2015 |
| Grant date | Jun 23, 2015 |
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The present invention provides a data processing system which can increase resolution and which has excellent tracking with respect to the switching of a conversion range and is small in conversion error. The data processing system, which obtains an A/D conversion result after an n (where n: positive integer)-bit extension made to the resolution of an A/D converter, divides the input range of the A/D converter by m (2 n ≦m), determines to which divided range the A/D conversion result by the A/D converter belongs with respect to an analog signal to be measured, amplifies an amp offset which defines the range of the determined divided range as a voltage range for the input range of the A/D converter by applying the amp offset to a programmable gain amplifier, converts the amplified signal by the A/D converter, and adds a corresponding digital offset to a result of execution of a lower side bit extension to the conversion result and a division thereof by actually measured gain of the programmable gain amplifier, whereby an A/D conversion result with a bit precision being n-bit extended is obtained.
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What is claimed is: 1. A method for obtaining an AD conversion result of an n (where n: positive integer) bit extension for the resolution of an AD converter by a control circuit in a data processing system in which the AD converter and a programmable gain amplifier are included, the method comprising: dividing an input range of the AD converter by m (2 n ≦m), preparing a digital offset at which voltages at connection points of respective divided ranges are identical between the…
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