Third-Order GM-C Filter with rail-to-rail input common-mode voltage
碩士 === 國立交通大學 === 電信工程系所 === 96 === This paper presents a CMOS low-power rail-to-rail transconductor under a supply voltage of 1.8-V. Base on the rail-to-rail transconductor, we build a third-order GM-C filter. Instead of using an n-type and a p-type differential input pairs, we use an n-type and a...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Others |
| Language: | en_US |
| Published: |
2007
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| Online Access: | http://ndltd.ncl.edu.tw/handle/75875003084028125218 |
| Summary: | 碩士 === 國立交通大學 === 電信工程系所 === 96 === This paper presents a CMOS low-power rail-to-rail transconductor under a supply voltage of 1.8-V. Base on the rail-to-rail transconductor, we build a third-order GM-C filter. Instead of using an n-type and a p-type differential input pairs, we use an n-type and a level-shift n-type differential input pairs to design a rail-to-rail input stage, and both of the differential pairs that work in the weak inversion cost less power than the traditional one. A novel level-shift n-type differential input pair is designed to maintain constant transconductance. The tunable cutoff frequency of the GM-C filter is needed. The total transconductance can be tuning by changing the tail current of the differential pairs. This work designed in TSMC 0.18-μm CMOS technology. Results show that the fluctuation of total transconductance of the proposed transconductor is less than ± 3%. And the cutoff frequency of the GM-C filter is 0.75MHz to 1.5MHz. The power dissipation of the GM-C filter is less than 4mW. The total harmonic distortion of the filter is about -35db.
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