Low-voltage high-frequency continuous-time filters are still required in many applications and are the subject of continuing research. There are many techniques to realize integrated filters, including OTA C, Opamp RC and MOSFET-C-Opamp. The latter two show high dynamic range at low supply voltage, but their frequency operating range is usually limited to several megahertz. Transconductance filters are dedicated to higher frequencies. However, the design of a low-distortion low-voltage OTA is still challenging. Taking this into account, it is worth to revise the obsolete concept of active RC-filter synthesis based on a current-inversion negative impedance converter (CNIC) as an active element. A novel current-inversion type negative impedance converter (CNIC) is presented. It is built without the use of any resistors. Furthermore, a second-order filter based on this CNIC is also analysed. It shows a -3 dB-defined bandwidth of 50MHz at 2V supply voltage when realized in a 0.35mm CMOS process.
Autorzy
Informacje dodatkowe
- Kategoria
- Publikacja w czasopiśmie
- Typ
- artykuły w czasopismach recenzowanych i innych wydawnictwach ciągłych
- Język
- angielski
- Rok wydania
- 2007
