A 400MHz 5th-order CMOS continuous-time switched-current Σ Δ modulator

A 5th-order continuous-time switched-current ΣΔ modulator was implemented in a 0.6µm CMOS process. A high sampling speed was achieved by using open-loop continuous-time integrators and differential current switches. The performance was optimized by using a 6th- order transfer function. With a 400MHz sampling rate and 64× OSR, this modulator achieved a maximum 56dB SNDR and 62dB dynamic range in a 3.1MHz bandwidth.