A 3-V continuous-time filter with on-chip tuning for IS-95 |
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Authors: | Lindfors S Jussila J Halonen K Siren L |
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Affiliation: | Electron. Circuit Design Lab., Helsinki Univ. of Technol., Espoo; |
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Abstract: | This paper describes a low-voltage channel selection analog front end with continuous-time low-pass filters and on-chip tuning for a receiver in an IS-95 cellular phone. The filters were realized as balanced seventh-order elliptical gmC filters to achieve low current consumption. The transconductors were realized by using second-generation current conveyors (CCII) and resistors to achieve good intermodulation distortion performance. A novel CCII circuit topology was developed to fulfil the low supply-voltage requirement. The cutoff frequency tuning was implemented with capacitance matrices and a time-domain master-slave tuning circuit |
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