A CMOS 8-bit 20MHz two-step parallel A/D converter with 95mW power consumption

CMOS Integrated Analog-to-Digital and Digital-to-Analog Converters

“…This two-step method uses a coarse and fine quantization to increase the resolution of the converter (see Figure 3.27). Examples of converters using the two-step architecture are given in these references: [39,54,55,57,58,80, 83J. Consider, for example, an 8-bit system that uses a 4-bit coarse quantization.…”

“…3.14.1 Current-folding AID converter system A simple example of a circuit implementation of a 4-level (2-bit) folding circuit is shown in Figure 3. 54. The most important parts are the reference = R), the differential output voltage Vout will be zero.…”

“…8. 54 At the input a multi-bit digital input is applied with a sampling frequency equal to mls with Is the sampling frequency of the non-oversampled D / A input signal. The oversampled binary input data is converted into a Sign-magnitude thermometer code.…”