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1. 发明公开

EP0715312A1 Monolitically integrated generator of a plurality of voltage values 失效
标题翻译： Monolithischer integrierter发生器von verschiedenen Speisespannungswerten
公开(公告)号：EP0715312A1
公开(公告)日：1996-06-05
申请号：EP94830554.5
申请日：1994-11-30
申请人： SGS-THOMSON MICROELECTRONICS S.r.l.
发明人： Pio, Frederico , Vajana, Bruno , Paruzzi, Paola
IPC分类号： G11C11/56 , G11C5/14
CPC分类号： G11C5/147 , G11C11/5621 , G11C16/30
摘要： The present invention relates to a monolithically integrable predetermined voltage generator (1) comprising a node (IN) held at a constant voltage (Vpp) and a plurality of circuit branches (2a, 2b, 2c and 2d) each of which incorporates at least one turn on control terminal (3a, 3b, 3c and 3d) and which are interconnected in such a manner that at least one of them leads to said node (IN). Across each of the branches (2a, 2b, 2c and 2d) a corresponding voltage drop is present when the branch is turned on and obtained from a certain number of active elements included in the branch. In accordance with a preferred embodiment, diode-connected MOS transistors are used as active elements. The generator also comprises an output terminal (OUT) associated with at least one of said branches at which is generated a predetermined voltage value.
A control signal is applied to at least one turn on control terminal (3a, 3b, 3c and 3d) of said plurality of branches for turning on a predetermined subset of said plurality of branches and generating at the output terminal (OUT) a voltage lower than that at said node (IN). Each of the predetermined voltage values is a predetermined combination of the voltage drops on the turned on branches.
In a preferred application, the generator of the present invention is used in a multilevel EEPROM memory circuit for generating a plurality of programming voltages for the memory cells.
摘要翻译：本发明涉及一种包括保持在恒定电压（Vpp）的节点（IN）和多个电路分支（2a，2b，2c和2d）的单片可积分预定电压发生器（1），每个电路分支包括至少一个打开控制终端（3a，3b，3c和3d），并以这样的方式相互连接，使得它们中的至少一个通向所述节点（IN）。在分支（2a，2b，2c和2d）中，当分支打开并从包括在分支中的一定数量的有源元件获得时，存在相应的电压降。根据优选实施例，二极管连接的MOS晶体管用作有源元件。发生器还包括与所述分支中的至少一个相关联的输出端子（OUT），在该输出端子产生预定电压值。控制信号被施加到所述多个分支的控制端子（3a，3b，3c和3d）上的至少一匝，用于导通所述多个分支的预定子集，并在输出端（OUT）处产生较低的电压比在所述节点（IN）处。预定电压值中的每一个都是开启分支上的电压降的预定组合。在优选的应用中，本发明的发生器用于产生用于存储单元的多个编程电压的多电平EEPROM存储器电路。

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