Single-Chip Fully Integrated Direct-Modulation CMOS RF Transmitters for Short-Range Wireless Applications (original) (raw)

Low Noise Low Power CMOS LC Voltage Controlled Oscillator for Wireless Sensor Network-A Review

Power consumption and size are the most important challenges faced when designing radio transceivers for distributed wireless sensor networks (WSN). The explosive growth of short range wireless communication systems has led to high demand of compact radio frequency (RF) circuit with low power and low phase noise design. As voltage control oscillator (VCO) is the core block of RF systems and critical sub-block in WSN communications transceivers. Although significant amount of research work has been carried out on VCOs, there still remains room for improvement and many new circuit schemes and new interpretation of phase noise can be found in recent times. This paper presents an idea of a low power low noise and highly miniaturized current reuse LC tank RF VCO design methodology.

Fully Integrated 2.2-mW CMOS Front End for a 900-MHz Wireless Receiver

—Low power consumption is the most important concern for integrated wireless devices. This paper illustrates low-power design principles in the CMOS context. They entail seeking strategic combinations of high-quality off-chip passives with RF integrated circuits and searching for better architectures in wireless receivers to low power. The principles are illustrated with a fully integrated 2.2-mW 1.2-V front end for 900-MHz receiver, fabricated in 0.35-m CMOS.