One of the most popular systems for performing high resolution analog to digital conversion is the modulator. Though common in applications, theoretical analysis of the modulator is difficult due to the presence of a discontinuous quantizer in the modulator. This paper presents asymptotic results regarding the statistical behavior of the modulator when inside the loop dithering is utilized. In ...

Higher order delta-sigma (∆Σ) modulator with one bit quantizer is known as one of the easiest method to gain a high resolution A/D converter without the need of accurately matched components. However, stability of higher order ∆Σ modulator is still a problem during the design and implementation process. Stabilizing higher order modulator requires the proper choice of integrator gains. In this p...

Departing from analyzing a general input-saturated second-order system, Lyapunov-based constructive procedure for the output-feedback stabilization of constantly perturbed DC-DC buck power converter is presented. The proposed scheme also incorporates ?-? modulator. obtained control developed in two parts: proportional-integral-type family algorithms devoted to regulating uncertain system by usi...

Recent progress in defining the molecular mechanisms of Hepatitis C Virus (HCV) entry affords the opportunity to exploit new viral and host targets for therapeutic intervention. Entry inhibitors would limit the expansion of the infected cell reservoir, and would complement the many replication inhibitors now under development. The current model for the pathway of entry involves the initial dock...

This paper reports the transistor-level design of a continuous-time 2-1 MASH sigma delta modulator with digital adaptive tuning of the cancellation logic. The modulator is designed for broadband wireless applications and provides 12 bits of resolution for a 10 MHz signal bandwidth. A direct approach to design the CT MASH modulator is used which reduces the coupling between the MASH stages. The ...

IEEE Trans. Circuits Syst II, vol. 48, no. 3, pp. 233{244, March 2001 Stability and Performance Analysis of an Adaptive Sigma Delta Modulator Mansour A. Aldajani, Student Member, IEEE, and Ali H. Sayed, Fellow, IEEE Abstract| This work develops an adaptive sigma delta modulator that is based on adapting the quantizer stepsize using estimates of the quantizer input rather than the modulator inpu...

Modulator is one of the most significant building-blocks in integrated discrete time component used in Sigma-Delta (ΣΔ) analog to digital converter. In this paper a novel structure of a switched-capacitor discrete time first order modulator Sigma-Delta is implemented at a supply voltage of 3 V. In addition, our design uses a Miller operational transconductance amplifier topology for low power c...

This paper gives a description of a modulator for burst-by-burst carrier frequency hopping in time-division multiple-access (TDMA) systems. The architecture consists of a digital frequency synthesizer/modulator for continuousphase modulations (CPM’s) and a fast frequency settling RF synthesizer consisting of one phase-locked loop (PLL). The performance of the digital frequency synthesizer/CPM m...

We have demonstrated a polymeric electro-optic modulator based on a 132 Y-fed directional waveguide coupler. The symmetric geometry of the 132 Y-fed directional coupler provided the modulator unique characteristics of intrinsic 3 dB operating point and two complementary output ends. A low switching voltage of 3.6 V and a high extinction ratio of 26 dB were obtained with the modulator operating ...

Power Scaling of a Q-switched laser designed for internal frequency conversion is demonstrated by combining two Nd:YVO4-gain-channels with a time-multiplexing scheme based on a single crystal photo elastic modulator (SCPEM). Both channels are coupled with a polarizer and share an output-coupler and acousto-optic modulator (AOM). In order to combine two channels by time multiplexing, the single ...