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- W87308857 abstract "Wireless bands and services are proliferating across the world. Every six months, it seems, a new use for wireless appears, often leading to a new standard. Manufacturers of mobile handsets have a hard time keeping up because the end user wants to access an increasing number of services from a single handset and have it adapt to global roaming. In the face of this proliferation, a universal, programmable software-defined radio (SDR) with low power and small form factor is urgently needed. This thesis presents the RF-analog front-end architecture and circuits of a low-power SDR receiver, capable of communicating over various standards in the 800-MHz to 6-GHz spectrum. To implement SDR receiver using Mitola's fully digital architecture, one needs high power A/D converters which makes this approach totally unsuitable for mobile applications. Instead, we envisage the SDR receiver as a programmable signal conditioner which amplifies the desired channel and de-emphasizes the unwanted signals prior to digitization by low-power A/D converters. A broadband RF front-end downconverts the desired channel from anywhere in the 800-MHz–6-GHz band to zero IF; where a combination of simple RC poles and clock programmable filters provides all the antialiasing and anti-blocking suppressions needed for the low power ADC. This replaces the traditional band specific RF preselect filter, narrowband LNA and baseband analog filters, allowing for a continuous coverage of the target spectrum and modulation bandwidths. Our SDR-RX requires broadband low noise amplifier (LNA) and high-linearity downconverting mixer, both of which are implemented on CMOS through novel circuit topologies introduced in this work. The measured results of the broadband LNA performance and the broadband mixer second order input referred intercept point (IIP2) set new state of the art for each. Furthermore, we exploited sinc(f) impulse response feature in a windowed integration sampler and designed two innovative clock programmable anti-aliasing filters. The receiver prototype consisting of wideband LNA, mixer, wide tuning range synthesizer and clock programmable filters is fabricated in 90-nm CMOS technology and measured to meet the main challenges of a low-power portable SDR-RX." @default.
- W87308857 created "2016-06-24" @default.
- W87308857 creator A5028638391 @default.
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- W87308857 date "2007-01-01" @default.
- W87308857 modified "2023-09-26" @default.
- W87308857 title "An 800-mhz to 6-ghz cmos software-defined-radio receiver for mobile terminals" @default.
- W87308857 hasPublicationYear "2007" @default.
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