公开(公告)号：EP0021462A3

公开(公告)日：1981-04-15

申请号：EP80200369

申请日：1980-04-23

申请人： PHILIPS ELECTRONIC AND ASSOCIATED INDUSTRIES LIMITED ,  N.V. Philips' Gloeilampenfabrieken

发明人： Moulding, Kenneth William ,  Wilson, Gordon Arthur ,  Canning, Jonathan Richard

IPC分类号： H03H11/08

CPC分类号： H03H11/08

摘要： In order to facilitate its construction as in integrated circuit the inductive elements of the two resonant circuits in a band-pass filter are each constituted by a first port of a respective gyrator circuit (22, 23 and 24, 25 respectively) the second port of which is loaded by a capacitor (3 and 6 respectively). The first ports, across which are connected capacitors (1 and 3 respectively), are coupled one to the other, as are the second ports, in such manner that a loop is formed comprising the two gyrator circuits and the two couplings, enabling the couplings to be obtained by coupling otherwise unused outputs (24 + and 22+) to otherwise unused inputs (22- and 24- respectively) of two-input two-output voltage-controlled current sources (22,24) which form part of each gyrator circuit.