No abstract

In this paper, a low power 2.4GHz front-end for sensor network application (IEEE 802.15.4 LR-WPAN) is designed with 0.18um CMOS process. A power supply circuit with novel temperature compensation scheme is presented. The simulation and measurement result shows that the front-end (LNA, Mixer) can achieve 35.3dB voltage gain and 3.1dB Noise Figure with 2.16mW power consumption at 27°C. NF included the loss of BALUN and BPF. The voltage gain, noise figure and third order intercept point(IIP3) variations over -45°C to 85°C are less than 0.2dB, 0.25dB and 1.5dB respectively.

No abstract

A 5-GHz frequency synthesizer for ZIGBEE(IEEE 802.15.4) was implemented. It consumes only 14mW adopting CMOS Logic divider and phase-switching dual-modulus. A 2 nd loop filter is internally embodied to reduce external components. The phase switching is made between the 45 spaced output phases to reduce the power consumption and improve the robustness of circuit. This synthesizer was fabricated in 0.18-um technology; it consumes 8mA at 1.8V and offers 100kHz-loop bandwidth and -103dBc/Hz at an offset of 1MHz. the lock time is 30us. The PLL output tuning range is 11% from 2.37GHz to 2.66GHzIndex Terms -Frequency divider, integer N PLL, phase locked loop, phase switching, prescaler.

No abstract