A 6th-Order Complex Bandpass $\Delta\Sigma \text{AD}$ Modulator Using Dynamic Amplifier and Noise Coupling SAR Quantizer

This paper presents a 6th-order complex bandpass ΔΣAD modulator (CBPDSM) with 2nd-order image rejection using dynamic amplifier and noise coupling (NC) SAR quantizer embedded by passive adder for the application of wireless communication system. A novel complex integrator using dynamic amplifier is proposed to reduce the power consumption of the CBPDSM. The NC SAR quantizer can realize an additional 2nd-order noise shaping and 2nd-order image rejection by the digital domain noise coupling technique. As a result, the 6th-order CBPDSM with 2nd-order image rejection is realized by two complex integrators using dynamic amplifier and the NC SAR quantizer. The feasibility of the proposed 6th-order CBPDSM is demonstrated by the SPICE simulation results in 90nm CMOS technology. Simulated SNDR of 76.30dB is achieved while a sinusoid -6.26dBFS input signal is sampled at 33.3MS/s and the bandwidth of 2.083MHz is achieved. The total power consumption of the CBPDSM is 6.74mW while the supply voltage is 1.2V.