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Novel implementation techniques, such as the use of direct-charge-transfer stage, noise coupling, and dynamic element matching can improve the performance of wideband ADCs. However, they introduce extra loop delay, which compromises the low-distortion property and even the loop stability. This paper shows how the addition of independent feedback and feed-forward branches to the loop...
A new dynamically-biased scheme is proposed to implement a 13-bit delta-sigma modulator with a 2.5 MHz signal bandwidth. It uses the low-distortion architecture, and hence the opamp linearity requirements are greatly relaxed. Its noise-coupled and time-interleaved structure further decreases the power consumption. The prototype chip was fabricated in a 0.18 um CMOS technology. Experimental results...
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