| Summary: | 碩士 === 大同大學 === 電機工程學系(所) === 99 === In recent years, Software Defined Radio (SDR) has taken place of the conventional wireless receiver gradually. The kernel concept of software defined radio is to annul mixers and to place analog-to-digital converters (ADC) as close to the antenna as possible. Therefore, we can use the advantage of programmability to implement more communication functions by software. Bandpass sampling is a useful method to solve the problem of down-conversion. However, the thermal noise introduced by sampling circuits would cause noise aliasing effect in sampling process. Hence the noise is increased and the signal to noise ratio (SNR) of bandpass sampling system is degraded.
In this thesis, switched-capacitor Generalized Uniform BandPass Sampling (GUBPS) is implemented with composite FIR and IIR filtering. According to Matlab simulation, the noise reduction and down-conversion can be achieved successfully. Finally, circuit-level simulation verification is done by HSPICE with TSMC 0.18um CMOS 1P6M models.
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