Calibration Techniques In Nyquist A/D Converters - download pdf or read online

By Hendrik van der Ploeg

In smooth structures sign processing is played within the electronic area. opposite to analog circuits, electronic sign processing bargains extra robustness, programmability, mistakes correction and garage threat. the rage to shift the A/D converter in the direction of the enter of the process calls for A/D converters with extra dynamic variety and better sampling speeds. This places severe calls for at the A/D converter and in all likelihood raises the ability intake.

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This is illustrated in the example where if the averaging resistance R2 is equal to zero, and for example 5 pre-amplifiers are in their linear input range, then these 5 pre-amplifiers can be seen as one lumped√pre-amplifier, with a size that is 5 times larger. This reduces the mismatch with 5. Intrinsic capacitance reduction Since the offset of the pre-amplifiers is reduced due to averaging, smaller devices can be used in order to achieve the same accuracy. This reduces the intrinsic capacitance (the total input capacitance of the pre-amplifier array).

23. The basic operation is the same as in the two-step architecture. The first stage samples the analog input signal. This signal is converted to the digital domain to estimate the held input. 23: Pipe-line A/D converter architecture with one bit per stage converter output. The D/A converter output is subtracted from the held analog input signal. This produces the residue signal, which is amplified before it is applied to the next stage. Contrary to the two-step architecture the second stage then samples this amplified residue signal and the same operations take place.

The requirements of the fine comparators are the total A/D converter accuracy divided by the gain of the residue amplifier. Redundancy The accuracy requirement of the subrange selection results in high demands on the coarse A/D converter, as described above. When the coarse A/D converter makes an error, missing codes occur since the corresponding residue signal does not fit in the selected subrange. 18a shows a proper subrange selection with its output code. 18b shows the effects of an incorrect subrange selection.

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