Amplituderegulator

Amplitudereguleringskrets (REG) som regulerer; henimot en referanse-amplitude (VR); en amplitude for en pulsbølgeform som genereres over en belastningsimpedans (L) av en såkalt H-avgrening; idet minst en av avgreningens svitsjer har en vari- abel impedans. Amplituderegulerings- kretsen (REG) innbefatter en måleinnret- ning (Cl) som måler amplituden under de fcrste deler av pulsbølgeformen og en reguleringsinnretning (OA,C2,CS1,S2,S3,- Q5,CS2,S4,S5,Q6) som styres av måle- innretningen (Cl) under de andre deler av pulsbølgeformen og som regulerer den variable impedans og dermed regulerer pulsbølgeformens amplitude. An amplitude regulation circuit (REG) is presented which regulates towards a reference amplitude (VR) an amplitude of a pulse waveform which is generated across a load impedance (L) by a so-called H-bridge, at least one of whose switches has a variable impedance. The amplitude regulation circuit (REG) includes a measuring means (C1) measuring said amplitude during first parts of said pulse waveform and a regulating means (OA, C2, CS1, S2, S3, Q5, CS2, S4, S5, Q6) which is controlled by said measuring means (C1) during second parts of said pulse waveform and which regulates said variable impedance, thereby regulating said pulse waveform amplitude.