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GaAs FET Current-Mode Integrators and Their Application to Filters
Authors:Nobukazu Takai  Nobuo Fujii
Affiliation:(1) Department of Physical Electronics, Tokyo Institute of Technology, Tokyo, 152–8552, Japan
Abstract:In this paper, current-mode integrators which consist of only n-channel depletion-mode FET and their application to filters are presented. Lossy integrator is simply realized with a capacitor and a grounded gate FET. Lossless integrator can be obtained by providing a lossy integrator with a positive feedback. To do this, multi-output current mirror is proposed. To reduce 2nd-order harmonic and THD of the filter, unbalanced/balanced conversion circuit is proposed. As an application example, 3rd-order leapfrog low-pass Chebyshev filter is simulated with GaAs MESFET process parameters. Simulation results show good performances.
Keywords:GaAs MESFET  current-mode  current mirror
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