Title :
Leap-frog circuit compensating influence of GB product and second pole of operational amplifier
Author :
Ishibashi, Y. ; Urakawa, H.
Author_Institution :
Inst. of Appl. Phys., Tsukuba Univ., Ibaraki, Japan
fDate :
6/1/1994 12:00:00 AM
Abstract :
The paper describes a method by which a high frequency leap-frog filter which simulates an LC filter is designed. First, taking account of the finite gain bandwidth product and the second pole of an operational amplifier, we analyse the frequency characteristics of a conventional inverting integrator. Second, we analyse the frequency characteristic of a phase-lead noninverting integrator and show the design formulas which give the element values to compensate phase lag of the inverting integrator. Finally, a fifth-order Chebyshev filter having a 1 dB pass-band ripple is designed. The operational amplifiers which have a gain-bandwidth product of f=5.33 MHz are used, and the cut-off frequency is set to 533 kHz (a tenth of the value of the GB product). It is shown that the measured response shows a good agreement with the theoretical value
Keywords :
active filters; compensation; frequency response; linear network analysis; linear network synthesis; lumped parameter networks; operational amplifiers; poles and zeros; 533 kHz; GB product; HF leap-frog filter; LC filter simulation; design formulas; fifth-order Chebyshev filter; finite gain bandwidth product; frequency characteristics; high frequency filter; inverting integrator; operational amplifier; phase-lead noninverting integrator; second pole;
Journal_Title :
Circuits, Devices and Systems, IEE Proceedings -
DOI :
10.1049/ip-cds:19941022
