Publication: Rekabentuk pencampur penukaran bawah menggunakan teknologi 0.18µm CMOS.
| datacite.subject.fos | oecd::Engineering and technology::Electrical engineering, Electronic engineering, Information engineering::Electrical and electronic engineering | |
| dc.contributor.author | Moh, Kim Hock | |
| dc.date.accessioned | 2026-10-29T08:08:19Z | |
| dc.date.available | 2026-10-29T08:08:19Z | |
| dc.date.issued | 2006-05 | |
| dc.description.abstract | This thesis works on the design of a key radio frequency (RF) front-end component in the UWB direct conversion transceiver, namely, the down conversion mixer. The down conversion mixer is designed according to the multiband orthogonal frequency division multiplexing (MB-OFDM) specifications using Siltera 0.18µm CMOS technology. The down conversion mixer topology is Gilbert cell based. Its performance is improved by adding the current-reuse technique and an extra resonant inductor, making it an appropriate topology for UWB applications. An optimum value of 3nH resonant inductor is used for the purpose. The operating RF input frequencies for this down conversion mixer is from 3.696GHz to 4.224GHz. The frequency range is the second sub-band for UWB transmission in Multiband OFDM Alliance (MBOA) proposal. The local oscillator (LO) carrier frequency is fixed at 3.96GHz. The designed mixer achieves voltage conversion gain of 5.18dB, double-side band noise figure of 4.51dB, IIP3 of -7.87dBm and 1dB compression point of -18.55dBm. The circuit dissipates 11.57mW under a supply voltage of 1.8V. The mixer performances have been verified through Cadence Spectre simulation. Apart from down conversion mixer design, mixer characterization is the second task in this thesis. The Maxim MAX2680 down conversion mixer is characterized according to its data sheet specification. Maxim MAX2680 is a double-balanced Gilbert cell mixer manufactured using silicon germanium process. Maxim MAX2680 provides a low power shut down feature which drives low to disable all device functions while drives high for normal operation. The MAX2680 evaluation kit includes all of the critical components needed in the test circuit and is purchased for the measurement purpose. The RF input is matched to 50Ω at 900MHz and the IF output is matched to 50Ω at 70MHz. The LO frequency is set to 970MHz. HP8593E spectrum analyzer (9kHz-26.5GHz) and HP8648B RF signal generator (9kHz-2000MHz) that cover the operating frequency of interest are used as the measurement tools. According to measurement results, with RF power of -25dBm and LO power of -5dBm, the MAX2680 provides power conversion gain of 18.4dB, 1dB compression point of -28.19dBm and IIP3 of -18.19dBm at the supply voltage of 3.0V and dissipates DC current of 5.05mA. | |
| dc.identifier.uri | https://erepo.usm.my/handle/123456789/25279 | |
| dc.language.iso | en | |
| dc.title | Rekabentuk pencampur penukaran bawah menggunakan teknologi 0.18µm CMOS. | |
| dc.type | Resource Types::text::report::technical report | |
| dspace.entity.type | Publication | |
| oairecerif.author.affiliation | Universiti Sains Malaysia |