Abstract: This paper presents a 10-bit 100-MSample/s analog-to-digital (A/D) converter with pipelined folding architecture. The linearity is improved by using an offset cancellation technique and a resistive averaging interpolation network. Cascading alleviates the wide bandwidth requirement of the folding amplifier and distributed interstage track/hold amplifiers are used to realize the pipeline technique for obtaining high resolution. In SMIC 0.18 μm CMOS, the A/D converter is measured as follows: the peak integral nonlinearity and differential nonlinearity are ±0.48 LSB and ±0.33 LSB, respectively. Input range is 1.0 V_P-P with a 2.29 mm² active area. At 20 MHz input @ 100 MHz sample clock, 9.59 effective number of bits, 59.5 dB of the signal-to-noise-and-distortion ratio and 82.49 dB of the spurious-free dynamic range are achieved. The dissipation power is only 95 mW with a 1.8 V power supply.

Key words: analog-to-digital converter, pipelined folding, resistive averaging interpolation, offset cancellation