A \u3cem\u3eK\u3c/em\u3e-Delta-1-Sigma Modulator for Wideband Analog to Digital Conversion

As CMOS technology shrinks, the transistor speed K-quantizing paths and can achieve significantly higher conversion bandwidths when compared to the traditional deltasigma ADCs. The 8-path KD1S modulator achieves an SNR of 58 dB (or 9.4-bits resolution) when clocked at 100 MHz for a conversion bandwidth of 6.25 MHz and an effective sampling rate equal to 800 MHz. The KD1S modulator has been fabricated in a 500 nm CMOS process and the experimental results are reported. Deficiencies in the first test chip performance are discussed along with their alleviation to achieve theoretical performance