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1. (WO1998051006) DRIVER CIRCUIT WITH PULL DOWN NPN TRANSISTOR
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1998/051006 International Application No.: PCT/US1998/008850
Publication Date: 12.11.1998 International Filing Date: 01.05.1998
IPC:
H03F 1/32 (2006.01) ,H03F 3/30 (2006.01)
H ELECTRICITY
03
BASIC ELECTRONIC CIRCUITRY
F
AMPLIFIERS
1
Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
32
Modifications of amplifiers to reduce non-linear distortion
H ELECTRICITY
03
BASIC ELECTRONIC CIRCUITRY
F
AMPLIFIERS
3
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
30
Single-ended push-pull amplifiers; Phase-splitters therefor
Applicants:
SONY ELECTRONICS INC. [US/US]; 1 Sony Drive Park Ridge, NJ 07656, US (AllExceptUS)
NAYEBI, Mehrdad [US/US]; US (UsOnly)
NGO, Duc [US/US]; US (UsOnly)
Inventors:
NAYEBI, Mehrdad; US
NGO, Duc; US
Agent:
HAVERSTOCK, Thomas, B. ; Haverstock & Owens LLP Suite 420 260 Sheridan Avenue Palo Alto, CA 94306, US
Priority Data:
08/853,49708.05.1997US
Title (EN) DRIVER CIRCUIT WITH PULL DOWN NPN TRANSISTOR
(FR) CIRCUIT DE COMMANDE DOTE D'UN TRANSISTOR NPN D'EXCURSION BASSE
Abstract:
(EN) A driver circuit with pull down npn transistor drives an output voltage signal in response to an input voltage signal, without high-speed pnp transistors. A first npn transistor (22) provides current to the output node when the output node is at a level equal to and less than the level of the input voltage signal less a base-to-emitter junction drop across the first npn transistor (22). A second npn transistor (20) sinks current from the output node when the output node is at a level greater than the level of the input voltage signal less the base-to-emitter junction drop across the first npn transistor (22). The second npn transistor (20) is controlled by a level of a control node (38). When the level of the output node is greater than the level of the input voltage signal less the base-to-emitter junction drop, the first npn transistor (22) is turned off and the level of the control node (38) is charged up by a current source (26). When the level of the control node (38) reaches a sufficient level, the second npn transistor (20) is turned on and the level of the output voltage signal is decreased.
(FR) Un circuit de commande doté d'un transistor npn d'excursion basse commande un signal de tension de sortie en réponse à un signal de tension d'entrée, sans transistor pnp rapide. Un premier transistor npn (22) fournit du courant à un noeud de sortie lorsque ce dernier est à un niveau inférieur ou égal à celui d'un signal de tension d'entrée moins une chute au niveau de la jonction base-émetteur à travers le premier transistor npn (22). Un second transistor npn (20) absorbe du courant du noeud de sortie lorsque ce dernier est à un niveau supérieur à celui du signal de tension d'entrée moins la chute au niveau de la jonction base-émetteur à travers le premier transistor npn (22). Le second transistor npn (20) est commandé par un niveau du noeud de commande (38). Lorsque le niveau du noeud de sortie est supérieur à celui du signal de tension d'entrée moins la chute au niveau de la jonction base-émetteur, le premier transistor npn (22) est mis hors circuit et le niveau du noeud de commande (38) est chargé par une source de courant (26). Lorsque le niveau du noeud de commande (38) atteint un niveau suffisant, le second transistor npn (20) est mis en circuit et le niveau du signal de tension de sortie est abaissé.
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Designated States: AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CU, CZ, DE, DK, EE, ES, FI, GB, GE, GH, GM, GW, HU, ID, IL, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, UA, UG, US, UZ, VN, YU, ZW
African Regional Intellectual Property Organization (ARIPO) (GH, GM, KE, LS, MW, SD, SZ, UG, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
AU1998071737