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A 4.06–4.89 GHz, low phase noise symmetric complementary voltage controlled oscillator (VCO), which features an optimized capacitive feedback technique combined with RC source degeneration, is presented in this paper. Fabricated in 180nm CMOS technology, the proposed VCO obtained a measured corner frequency of 15–80 KHz. The measured phase noise at 1MHz offset from the 4.89GHz carrier is −119dBc/Hz...
This paper presents a low power and high gain limiting amplifier for Gbps wireless communication system in 0.18μm CMOS technology. It incorporates negative active inductor, negative resistance and negative capacitance to boost gain and bandwidth. Drawing 2.8mA from 1.8V supply, the limiting amplifier achieves 1.25Gbps data rate and 52dB differential gain. The chip is fully integrated, which occupies...
In the remote, hazardous, distributed and external environment, such as radiation source, pollutant source and pipeline of petrol, water and gas, it is difficult to collect and send the necessary message in real-time by traditional monitoring ways. This paper briefly describes the design of remote wireless monitoring system based on MCU (Micro-programmed Control Unit) and GPRS (General Packet Radio...
Different from the traditional wireless networks, in wireless sensor networks(WSNs), power consumption is a critical aspect, because current nodes are always supported by constrainedenergy battery. A particular challenge in maintaining extended battery lifetime lies in achieving communications with low power. For better understanding of the design trade offs of WSNs, a more accurate power consumption...
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