Title :
VHF current-mode filter based on intrinsic biquad of the regulated cascode topology
Author :
Yodprasil, U. ; Sirivathanani, K.
Author_Institution :
Dept. of Electron. Eng., Mahanakorn Univ. of Technol., Bangkok
Abstract :
An approach to realise a CMOS very-high-frequency (VHF) current-mode filter is presented in this paper. By considering current signals flow in a conventional two-transistor regulated cascode topology, a current-mode biquad can be accomplished inherently. Hence, bandpass and lowpass transfer functions can be obtained simultaneously. A current-compensation technique is utilised to compensate for the loss due to negative feedback of the basic regulated cascode scheme yielding higher Q factors. Simulation results verifying the feasibility of the proposed filter to operate in the 900 MHz-1 GHz region with the dynamic ranges comparable to other techniques are illustrated
Keywords :
CMOS analogue integrated circuits; UHF filters; UHF integrated circuits; VHF filters; band-pass filters; biquadratic filters; circuit feedback; compensation; current-mode circuits; low-pass filters; 900 MHz to 1 GHz; CMOS filter; Q factors; UHF current-mode filter; active filter; bandpass transfer function; current-compensation technique; current-mode biquad; intrinsic biquad; lowpass transfer function; negative feedback; regulated cascode topology; Band pass filters; CMOS technology; Circuit topology; Cutoff frequency; MOSFETs; Q factor; Signal processing; Transconductors; Transfer functions; Voltage;
Conference_Titel :
Circuits and Systems, 2001. ISCAS 2001. The 2001 IEEE International Symposium on
Conference_Location :
Sydney, NSW
Print_ISBN :
0-7803-6685-9
DOI :
10.1109/ISCAS.2001.921818
