Abstract — In this paper, two different VCO-Based quantizers architectures are implemented and compared as multi-bit quantizers of Continuous-Time (CT) Sigma-Delta (Σ∆) modulator. The first one is the voltage-to-frequency while the second is the voltage-to-phase architecture. Two 4 th order CT-Σ ∆ modulators are designed with Voltage-to-frequency and voltage-tophase quantizers respectively. Both modulators are designed and simulated in 0.13µm technology. The comparision shows that voltage-to-phase quantizer remarkably reduces the VCO nonlinearity and increases the modulator’s maximum SNR. Fig. 1. quantizer. Continuous-Time Σ ∆ modulator with VCO-based time-domain I
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