| Summary: | 碩士 === 國立臺北大學 === 電機工程研究所 === 98 === This thesis presents the front end receiver circuit for the small tri-band antenna that was recently developed in [1]. This antenna is capable of operating in the MICS band, which corresponds to the frequency band between 402MHz and 405MHz. Due to limitations in the NF and compression points in this frequency band, a low IF (intermediate frequency) super-heterodyne receiver was chosen as the system architecture for this work. The super-heterodyne receiver of this work is designed for and intended data rate of 200Kbps using an FSK (frequency shift keying) pass band coding scheme [2], and this receiver includes an LNA and a mixer, both of which include output buffers and switches as well.
The LNA is a modified version of the current reuse LNA with feedback that was originally presented in [3]. On the other hand, the Gilbert-cell mixer of this work uses a current reuse topology to reduce power consumption. The parameters of this mixer were optimized from its original version presented in [4]. In addition to the LNA, mixer and respective buffers, the front end also includes a low Q (quality) on-chip impedance matching network. Finally, this front end achieves a maximum total power consumption of 3mW operating from a single 1.8V implantable battery, for the LNA and mixer operating at maximum currents, and the total area including pads is 1.4mm1.2mm.
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