Aplikace transkonduktančních zesilovačů v telekomunikační technice

Abstract

This work deals with transconductance amplifiers OTA and their usage in frequency filters. There are described characteristics of OTA amplifier here, thanks by which is just possible element for frequency filters. That main characteristic is posibility tuning transconductance gm. Further is state view of commercially accessible OTA amplifiers on market. In next part is made analysis filters 1. and 2. degree and some of types universal filters that filling – up all three basic function, than low pass, high pass and band pass. There are introduced schematics wiring, derived proposal figures and frequency characteristics. For all filters is made simulation in computer programme SNAP for check rightness proposal. Next chapter is practical check on derived procedures on select type of filter. Last chapter includes procedure of propsal filters highers degrese by means of cascade synthesis, whoose principle consists in breakdown transmission function on partial transmission function 1. and 2. degrese.