Low-distortion bandpass ΣΔ modulator using two-path double-sampling technique

Two-path double delay line based bandpass quadrature SD modulator

Double-sampling analog-look-ahead second order ΣΔ modulator with reduced dynamics

A double sampled second order ΣΔ modulator with an analog look ahead (ALA) approach is presented. The proposed architecture provides an extra clock period to be used for the quantization. The feedforward path in both integrators allows the further reduction of the output voltage swing, relaxing also the slew-rate requirements of the op-amps. Moreover, the modulator enables the reduction of the ...

A 10.7-MHz bandpass sigma-delta modulator using double-delay single-opamp SC resonator with double-sampling

The design of a 10.7-MHz 4-order fs/4 bandpass sigma-delta modulator with a double-delay single-opamp resonator plus double-sampling technique is proposed for GSM standard. The circuit is implemented in 0.35μ m double-poly, triple-metal CMOS process. Both behavioral-level and transistor-level simulation results are presented, and the circuit is expected to achieve >80 dynamic range with occupyi...

Design of a 70-MHz IF 10-MHz bandwidth bandpass ΣΔ modulator for WCDMA applications

In this paper we present a MASH bandpass Σ∆ modulator for WCDMA applications. The signal bandwidth of the proposed modulator is 10 MHz, centered around an intermediate frequency (IF) of 70 MHz. Each Σ∆ modulator of the MASH structure is based on a two-path architecture, which allow us to obtain the desired in-band noise shaping zeros and reduce the power consumption. The Σ∆ modulator is impleme...

Low-voltage low-sensitivity switched-capacitor bandpass Sigma-Delta modulator

The recent explosion of interest in wireless personal communication systems motivates the development of fully integrated radio receivers. The parallel reduction of the dimension in CMOS technology, and hence higher levels of integration enables the combined integration of bandpass or baseband analog-to-digital converter along with the traditional front-end receiver building blocks. While this ...