Analog Baseband Circuits for WCDMA Direct-Conversion Receivers;Doctoral thesis

摘要

This thesis describes the design and implementation of analog base band circuits for low-power single-chip WCDMA direct-conversion receivers. The reference radio system throughout the thesis is UTRA/FDD. The analog base band circuit of two similar channels, which contain analog channel-select filters, programmable-gain amplifiers and circuits that remove DC offsets. The direct-conversion architecture is described and the UTRA/FDD system characteristics are summarized. The UTRA/FDD specifications define the performance requirement for the whole receiver. Therefore, the specifications for the analog base band circuit are obtained from the receiver requirements through calculations performed by hand. In this thesis, all the filter implementations use the opamp-RC technique to achieve insensitivity to parasitic capacitances and a high dynamic range. The adopted technique is analyzed in detail.