Title :
A ±1.5-V, 4-MHz CMOS continuous-time filter with a single-integrator based tuning
Author :
Yoo, Changsik ; Lee, Seung-Wook ; Kim, Wonchan
Author_Institution :
Lab. of Integrated Syst., Seoul Nat. Univ., South Korea
fDate :
1/1/1998 12:00:00 AM
Abstract :
A 4-MHz, fifth-order elliptic low-pass Gm-C filter is described whose characteristics are tuned by an on-chip automatic tuning circuit. The tuning circuit uses only one integrator as the master of tuning instead of problematic voltage controlled oscillator (VCO) and voltage controlled filter (VCF). MOS transistors in linear operation region perform the voltage-to-current conversion in an operational transconductance amplifier, and thereby we achieved ±1.5 V operation. A prototype filter was implemented in a 0.8-μm double-poly, double-metal CMOS process. The filter exhibits the dynamic range of 57.6 dB and dissipates 10 mW with ±1.5-V supply. The stopband attenuation is better than 45.0 dB and the passband ripple is smaller than 1.0 dB
Keywords :
CMOS analogue integrated circuits; circuit tuning; continuous time filters; elliptic filters; integrating circuits; low-pass filters; operational amplifiers; 0.8 micron; 1.5 V; 10 mW; 4 MHz; CMOS continuous-time filter; MOS transistor; double-poly double-metal CMOS process; dynamic range; fifth-order elliptic low-pass Gm-C filter; linear operation; on-chip automatic tuning circuit; operational transconductance amplifier; passband ripple; power dissipation; single integrator; stopband attenuation; voltage-to-current conversion; CMOS process; Circuit optimization; Low pass filters; MOSFETs; Operational amplifiers; Prototypes; Transconductance; Tuned circuits; Voltage control; Voltage-controlled oscillators;
Journal_Title :
Solid-State Circuits, IEEE Journal of
