| In Wireless Communications Systems, the upward need for larger bandwidth channels, higher data transmission rates thoroughly stakes in new standards, ushering a new technologic era while including multiple heterogeneous services. The new standards should underpin services including voice, image, and multimedia, simultaneously conveyed in the same physical channel, and providing wide variety of Communication Services for each individual, anywhere and anytime. The Ultra-Wideband (UWB) Communication Standard operates the frequency bands between 3.1-10.6GHz, divided into 14 sub channels of 528MHZ bandwidth each. Extended research with room for advancement involving the UWB standard have been undertaken during the last years, with much more purpose in getting grip on both hardware and algorithmic reception system challenges.;The research project mainly aims at addressing the Transform Domain Receiver implementation challenge, ushered by the Hoyos and Sadler proposal. Thus, in addition to the Frequency Domain baseband signal expansion circuit, the Front-End circuit, broadly akin to the conventional architecture one, should henceforth develop a relatively high selectivity level, critical when using the orthogonality principal in the Frequency Domain. The receiver system eventual loss of orthogonality during the Frequency Domain analog-to-digital conversion has once made the receiver selectivity necessary.;Proposals will be focused on the UWB Wireless Local Area Network (WLAN) laying between 5-6GHz. Consequently, the research methodology hinges on two major axes: (1) The first based on the Time Domain selective analog UWB WLAN Front-End, proposed in the 0.18μm CMOS technology, and featuring the Multi-Block linear, low noise amplifier (LNA. The Front-End circuit dissipates 10.9 mA from 1.8 V supply voltage, and achieves 34.8dB conversion gain, 6.42dB noise figure at 5.6GHz. The circuit shows a significant robustness with respect to the adjacent signal interferers producing 1-dB desensitization gain with -8dBm interferer power at 7GHz. (2) The second axis is the Transform Domain Receiver second part circuit, considering a Frequency Domain baseband signal expansion circuit proposal, based on the Folded Gilbert Cell Mixer circuit proposal, with integrated low-pass filter. The circuit lies in 1.680x 1.080 mmA2 active area, leading to 64% implementation surface reduction compared to the conventional, digital time domain UWB receiver architecture.;Ultra-Wideband receiver architecture was first proposed in a 'Conventional' structure, where the analog signal processed at the reception was to be converted into a digital signal using analog-to-digital converters (ADC), where the conversion rate could easily retched up to 500Mb/s. By introducing the orthogonality principal in the Frequency Domain, Hoyos and Sadler proposal [HOY07] means to first process the wideband analog signal received in Time Domain, prior to process the Frequency Domain analog-to-digital conversion. The signal to be converted is expanded over an appropriate basis set [HOY04], and hence, the `Transform Domain Receiver' term. |
