Title :
100-MHz monolithic low-pass filters with transmission zeros using NIC integrators
Author :
Takagi, Shigetaka ; Nitta, Hajime ; Koyama, Jorge ; Furihata, Makoto ; Fujii, Nobuo ; Nagata, Minoru ; Yanagisawa, Takeshi
Author_Institution :
Tokyo Inst. of Technol., Japan
fDate :
4/1/1991 12:00:00 AM
Abstract :
A monolithic method of implementing VHF filters with transmission zeros is presented. The transmission zeros are obtained using a modified leapfrog simulation method realized without floating capacitors that does not require summing circuits inside the feedback loops. The integrators used are balanced negative impedance converter (NIC) integrators with grounded capacitors, which do not require p-n-p transistors and are suited for low-voltage applications. A low-pass filter with a cutoff frequency of 100 MHz and with a transmission zero at 166 MHz designed and built in an integrated circuit form showed good results, confirming the feasibility of the method
Keywords :
active filters; bipolar integrated circuits; integrating circuits; linear integrated circuits; low-pass filters; negative impedance convertors; poles and zeros; radiofrequency filters; 100 MHz; NIC integrators; VHF filters; balanced negative impedance converter; cutoff frequency; grounded capacitors; integrated circuit form; low-voltage applications; modified leapfrog simulation method; monolithic low-pass filters; transmission zeros; Active filters; Band pass filters; Capacitors; Filtering theory; Gyrators; Impedance; Low pass filters; Matched filters; Power supplies; Resistors;
Journal_Title :
Solid-State Circuits, IEEE Journal of
