A Modified Gm-C Filter for WCDMA
碩士 === 國立清華大學 === 電機工程學系 === 92 === Abstract The third generation wireless communication systems (3G) prevail over the market recently. This is because the 3G systems provide higher data rate than the traditionally 2G ones. The direct conversion receiver is a possible solution due to low-power, low-...
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| Format: | Others |
| Language: | en_US |
| Published: |
2004
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| Online Access: | http://ndltd.ncl.edu.tw/handle/46175470727709228720 |
| Summary: | 碩士 === 國立清華大學 === 電機工程學系 === 92 === Abstract
The third generation wireless communication systems (3G) prevail over the market recently.
This is because the 3G systems provide higher data rate than the traditionally 2G ones. The direct
conversion receiver is a possible solution due to low-power, low-cost requirement. Channel-select
filter is a crucial building block since it has to define the desired signal bandwidth and attenuate
the out-band interference to reduce the dynamic range requirement of ADC.
The First chapter describes the channel-select filter in different receiver architectures. Basic
theories of the WCDMA system and analog filter are introduced in chapter 2.
Chapter 3 presents the modified gm-C architecture for CMOS continuous time filter design.
It achieves high linearity under low supply voltage operation. The filter is suitable for fully
integrated wireless receivers, like WCDMA system 1.92MHz signal bandwidth.
The simulation results of Six-order Butterworth channel-select filter based on modified gm-C
structure is illustrated. The filter is realized on TSMC 1P6M CMOS process. The filter linearity is
simulated under the out-band two tone test condition. spurious free dynamic range is 62 dB under
1.8V supply voltage.
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