This paper presents a new approach to increase the output power and to enhance the drain efficiency of Direct Digital RF Modulators (DDRM). Two differential four-phase DDRMs are organized in aâ€¦ (More)

This paper proposes the use of a high-power stacked output stage for a current-based in-phase/quadrature (<inline-formula> <tex-math notation="LaTeX">$I/Q$ </tex-math></inline-formula>) directâ€¦ (More)

This paper presents a new approach to reduce the out of band quantization noise of Direct Digital RF Modulators (DDRM). The DDRM is organized in a FIR-like configuration to filter the quantizationâ€¦ (More)

Proceedings of 2010 IEEE International Symposiumâ€¦

2010

A methodology for the design of Continuous-Time (CT) Sigma-Delta (Î£Î”) modulators with VCO-based quantizer is proposed. The coefficients of the CT Î£Î” modulator are accurately calculated such that theâ€¦ (More)

A methodology for the design of Continuous-Time (CT) Sigma-Delta (Î£âˆ†) modulators with VCO-based quantizer is proposed. The coefficients of the CT Î£âˆ† modulator are accurately calculated such that theâ€¦ (More)

Design of a 0.9-V 5-MHz sampling frequency 120-ÂµW 1-bit fourth-order feedforward Sigma-Delta modulator using a standard CMOS 130-nm technology is presented. Modifications to an OTA design to improveâ€¦ (More)