Title :
A 2-Vpp 80-200-MHz fourth-order continuous-time linear phase filter with automatic frequency tuning
Author :
Chen, Mingdeng ; Silva-Martí, José ; Rokhsaz, Shahriar ; Robinson, Moises
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
Abstract :
A CMOS 80-200-MHz fourth-order continuous-time 0.05° equiripple linear phase filter with an automatic frequency tuning system is presented. An operational transconductance amplifier based on transistors operating in triode region is used and a circuit that combines common-mode feedback, common-mode feedforward, and adaptive bias is introduced. The chip was fabricated in a 0.35-μm process; filter experimental results have shown a total harmonic distortion less than -44 dB for a 2-Vpp differential input with a single 2.3-V power supply. The group delay ripple is less than 4% for frequencies up to 1.5 fc. The frequency tuning error is below 5%.
Keywords :
CMOS analogue integrated circuits; VHF filters; circuit tuning; continuous time filters; equiripple filters; harmonic distortion; linear phase filters; low-power electronics; operational amplifiers; 0.35 micron; 2.3 V; 80 to 200 MHz; CMOS fourth-order continuous-time equiripple linear phase filter; OTA-C filters; adaptive bias; automatic frequency tuning; common-mode feedback; common-mode feedforward; differential input; fourth-order continuous-time linear phase filter; frequency tuning error; group delay ripple; operational transconductance amplifier; pseudodifferential amplifiers; total harmonic distortion; triode region operating transistors; Automatic frequency control; Circuit optimization; Feedback circuits; Nonlinear filters; Operational amplifiers; Power harmonic filters; Power supplies; Total harmonic distortion; Transconductance; Tuning;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2003.817595
