| 摘要 |
THE INVENTION RELATES TO A FILTER CIRCUIT AND A METHOD FOR MAKING A FILTER CIRCUIT COMPRISING AT LEAST ONE GYRATOR CORE SECTION (GCI) HAVING FOUR INVERTERS MUTUALLY CONNECTED IN A LOOP CONFIGURATION BETWEEN A PAIR OF INPUT TERMINALS (i_1;i_2) AND A PAIR OF OUT PUT TERMINALS (O_1; 0_2).AT LEAST ONE COMMON MODE FEEDBACK SECTION (CMIi, CMOi) IS PROVIDED BETWEEN THE PAIR OF INPUT TERMINALS AND/OR THE PAIR OF OUTPUT TERMINALS . THE COMMON MODE FEEDBACK SECTION COMPRISES TWO SERIES CONNECTIONS RESPECTIVELY FORMED BY AN INVERTER AND A SHORT-SECTIONED INVERTER CONNECTED ANTIPARALLELLY BETWEEN THE INPUT TERMINALS OR THE OUTPUT TERMINALS. THE INVERTERS MAY BE CONSTITUTED BY A MOS, OR BICMOS OR BIPOLAR TRANSISTOR .ACCORDING TO THE INVENTION, THE CHANNEL REGION DIMENSIONS OF THE TRANSISTORS OF THE GRYTOR CORE SECTION AND /OR THE COMMON MODE FEEDBACK SECTION ARE SELECTED SUCH THAT THE RELATIONSHIP G*C> GM*CM IS FULFILLED, WHERE G IS THE EFFECTIVE CONDUCTIVE LOADING OF THE GYRATOR CORE SECTION TERMINALS, C IS THE EFFECTIVE CAPACITIVE LOADING OF THE GYRATOR CORE SECTION TERMNINALS , GM IS THE EFFECTIVE GYRATION CONSTANT OF THE GYRATOR CORE SECTION, AND CM IS THE EFFECTIVE TRANSCAPACITANCE OF THE GYRATOR CORE SECTION .
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