Electronically Tunable Lc High Pass Ladder Filter Using Otra

Abstract

This paper presents Operational trans-resistance (OTRA) based electronically tunable high pass L-C based ladder filter. The proposed high pass filter is designed by following a systematic approach using leap frog simulation for ladder filters. The cutoff frequency of the proposed filter can be varied with the application of appropriate voltages to the gate of MOSFETs hence making the design electronically tunable. Therefore, it can be used for RF applications at 455kHz and 1MHz (intermediate frequencies for RF applications). Performance of the proposed circuit is verified through SPICE simulations employing a 0.5m MOSIS AGILENT CMOS realization of OTRA.

Electronic Tuning Square-Wave Generators with Improved Linearity Using Operational Transresistance Amplifier

“…Recently, an active current-mode device, called an operational transresistance amplifier (OTRA), has come to limelight with the introduction of several high performances CMOS OTRA realizations. Several waveform generators using an operational transresistance amplifier (OTRA) were reported earlier in the literature [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]. Square-waveform generator using single OTRA and a few passive components was proposed in [28].…”