公开(公告)号：WO1988008225A1

公开(公告)日：1988-10-20

申请号：PCT/US1988000834

申请日：1988-03-15

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  HO, Kesse ,  CAIN, Bradley, B.

IPC: H03F01/48

CPC classification number: H04N5/148 ,  H03F3/19

Abstract: A broadband, high speed, signal inverting video amplifier (10) comprises a generally conventional, main cascode amplifier (20) and first and second current boosting cascode amplifiers means (14, 16) which are capacitively (CB3, CB2) coupled to the main cascode amplifier (20). The first current boosting amplifier (14) provides a positive current spike (62) in response to an input video signal (22) abruptly decreasing, the positive current spike (62) provided thereby being fed into the main cascode amplifier (20) in a manner causing the current spike (62) to be added to current (I) through the main amplifier (20) when the amplified video signal (22) goes positive. The second current boosting amplifier (16) provides a negative current spike (64) in response to the input video signal abruptly increasing, the negative current spike (64) provided thereby being fed into the main cascode amplifier (20) in a manner causing the such current spike to be subtracted from the current (I) through the main amplifier (20) when the amplified video signal (22) goes negative. The positive and negative spikes (62, 64) cause the amplified output video signal (42) to have rise and fall times to be less than about 3.5 nanoseconds at loads (C TOTAL) of at least about 25 pf at peak-to-peak output voltages of at least about 40 volts and to be no more than about 1.8 nanoseconds at about 20 volts peak-to-peak for a load of (C TOTAL) about 14.5 pf.

公开(公告)号：EP0309580A1

公开(公告)日：1989-04-05

申请号：EP88905040.0

申请日：1988-03-15

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HO, Kesse ,  CAIN, Bradley, B.

IPC: H03F1 ,  H03F3 ,  H04N5 ,  H04N9

CPC classification number: H04N5/148 ,  H03F3/19

Abstract: Un amplificateur vidéo (10) de haute vitesse, à large bande et inverseur de signaux comprend un amplificateur cascode principal (20), généralement conventionnel, des premier et second éléments amplificateurs (14,16) d'augmentation du courant capacitivement (CB3, CB2) couplés à l'amplificateur cascode principal (20). Le premier amplificateur (14) d'augmentation du courant fournit à l'amplificateur cascode principal (20) une crête positive de courant (62) en réponse à la chute abrupte d'un signal d'entrée video (22), de sorte que la crête de courant (62) vient s'ajouter au courant (I) à travers l'amplificateur principal (20) lorsque le signal vidéo amplifié (22) devient positif. Le deuxième élément amplificateur (16) d'augmentation du courant fournit une crête négative (64) de courant à l'amplificateur cascode principal (64) lors d'une augmentation abrupte du signal d'entrée vidéo, de sorte que cette crête négative est soustraite du courant (I) à travers l'amplificateur principal (20) lorsque le signal vidéo amplifié (22) devient négatif. Les crêtes positive et négative (62, 64) entraînent des temps de montée et de chute du signal amplifié de sortie vidéo (42) inférieurs à 3,5 nanosecondes environ à des charges (C TOTAL) d'au moins 25 pf environ à des tensions crête-à-crête de sortie d'au moins 40 volts environ et des temps de montée et de chute ne dépassant pas 1,8 nanosecondes à des tensions crête-à -crête d'environ 20 volts à une charge de 14,5 pf environ (C TOTAL).

公开(公告)号：EP0309580B1

公开(公告)日：1995-09-06

申请号：EP88905040.7

申请日：1988-03-15

Applicant: Hughes Aircraft Company

Inventor： HO, Kesse ,  CAIN, Bradley, B.

IPC: H03F1/48 ,  H03F1/22 ,  H03F3/19 ,  H04N9/64

CPC classification number: H04N5/148 ,  H03F3/19

Abstract: A broadband, high speed, signal inverting video amplifier (10) comprises a generally conventional, main cascode amplifier (20) and first and second current boosting cascode amplifiers means (14, 16) which are capacitively (CB3, CB2) coupled to the main cascode amplifier (20). The first current boosting amplifier (14) provides a positive current spike (62) in response to an input video signal (22) abruptly decreasing, the positive current spike (62) provided thereby being fed into the main cascode amplifier (20) in a manner causing the current spike (62) to be added to current (I) through the main amplifier (20) when the amplified video signal (22) goes positive. The second current boosting amplifier (16) provides a negative current spike (64) in response to the input video signal abruptly increasing, the negative current spike (64) provided thereby being fed into the main cascode amplifier (20) in a manner causing the such current spike to be subtracted from the current (I) through the main amplifier (20) when the amplified video signal (22) goes negative. The positive and negative spikes (62, 64) cause the amplified output video signal (42) to have rise and fall times to be less than about 3.5 nanoseconds at loads (C TOTAL) of at least about 25 pf at peak-to-peak output voltages of at least about 40 volts and to be no more than about 1.8 nanoseconds at about 20 volts peak-to-peak for a load of (C TOTAL) about 14.5 pf.