Title :
A 3-V continuous-time filter with on-chip tuning for IS-95
Author :
Lindfors, Saska ; Jussila, Jarkko ; Halonen, Kari ; Siren, Lauri
Author_Institution :
Electron. Circuit Design Lab., Helsinki Univ. of Technol., Espoo, Finland
fDate :
8/1/1999 12:00:00 AM
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
Keywords :
CMOS analogue integrated circuits; cellular radio; circuit tuning; continuous time filters; current conveyors; elliptic filters; intermodulation distortion; low-pass filters; low-power electronics; telephone sets; 3 V; CCII; CCII circuit topology; IMD performance; IS-95 cellular phone; LV channel selection analog front end; balanced seventh-order filters; capacitance matrices; continuous-time filter; cutoff frequency tuning; elliptical gmC filters; intermodulation distortion performance; low current consumption; low-pass filters; low-voltage analog front end; onchip tuning; receiver application; second-generation current conveyors; time-domain master-slave tuning circuit; transconductors; Capacitance; Cellular phones; Circuit optimization; Circuit topology; Cutoff frequency; Intermodulation distortion; Low pass filters; Resistors; Time domain analysis; Transconductors;
Journal_Title :
Solid-State Circuits, IEEE Journal of
