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    • 2. 发明授权
    • Off-chip driver circuit with reduced hot-electron degradation
    • 片外驱动电路,减少热电子降解
    • US5726589A
    • 1998-03-10
    • US551663
    • 1995-11-01
    • Joseph J. CahillRobert R. Williams
    • Joseph J. CahillRobert R. Williams
    • H03K19/003H03K19/0185H03K19/0948
    • H03K19/00315
    • An output driver circuit for a semiconductor chip has a push-pull output with a P-channel pull-up and an N-channel pull-down. Predrivers produce push-pull outputs for driving the gates of the output driver. In previous circuits, a stacked arrangement was usually employed where the N-channel pull-down transistor had another N-channel transistor, with gate connected to the voltage supply, in series with it. In this invention, a parallel N-channel or P-channel transistor is employed to shunt part of the current at the beginning of a transition from high-to-low at the output node of the off-chip driver circuit, and thus lower the voltage across the pull-down transistor to a level which will avoid hot-electron degradation. This parallel transistor is small compared to the main N-channel pull-down, and serves to reduce the output node voltage to a level which does not present a likelihood of hot-electron effects in the main pull-down device. Thus, large current flow through the N-channel pull-down is delayed until the voltage is reduced to an acceptable level. At the same time, this delay is not such as would unduly compromise the high speed nature of the circuits.
    • 用于半导体芯片的输出驱动器电路具有P沟道上拉和N沟道下拉的推挽输出。 预驱动器产生用于驱动输出驱动器的门的推挽输出。 在以前的电路中,通常采用堆叠布置,其中N沟道下拉晶体管具有另一个N沟道晶体管,其栅极连接到电压源,与其串联。 在本发明中,并行N沟道或P沟道晶体管用于在片外驱动电路的输出节点从高到低的转变开始时分流电流的一部分,从而降低 跨越下拉晶体管的电压达到避免热电子降解的水平。 该并联晶体管与主N沟道下拉相比较小,并且用于将输出节点电压降低到在主下拉器件中不存在热电子效应的可能性的水平。 因此,延迟通过N沟道下拉的大电流流动直到电压降低到可接受的水平。 同时,这种延迟不是会不利地影响电路的高速性质。
    • 6. 发明授权
    • Capacitive touch panel control
    • 电容触摸屏控制
    • US4394643A
    • 1983-07-19
    • US258589
    • 1981-04-29
    • Robert R. Williams
    • Robert R. Williams
    • H03K17/96G06F3/02H01G7/00
    • H03K17/962
    • A capacitive touch panel control provided with first and second conductive circuit pads on opposite faces of a thin dielectric sheet in the form of a film secured to a dielectric panel by adhesive. The panel is provided with a touch pad. The circuit pads are disposed so that at least a portion of each is in appositional facial registration with the touch pad and out of appositional facial registration with each other so as to provide a variable capacitance between the circuit pads as an incident of selective touching and non-touching of the touch pad by a user. The circuit pads may form a portion of a printed circuit on the film which further includes electrical conductors for making connection to associated apparatus. Ground conductors may be provided on the film adjacent the output voltage conductors of the circuit to reduce leakage between the circuit conductors. The provision of the circuit pads on opposite faces of the film permits electrically insulated crossover of the conductors for facilitated layout of the circuit.
    • 电容式触摸面板控制器,其设置有薄膜电介质薄片的相对表面上的第一和第二导电电路垫片,该薄电介质薄片通过粘合剂固定到电介质面板上。 面板配有触摸板。 电路板被布置成使得每个电路板的至少一部分与触摸板成对准的面部对准,并且彼此不进行配置面部对准,以便在电路板之间提供可选择的触摸事件和非选择性触摸事件的可变电容 用户触摸板的触摸。 电路板可以形成薄膜上的印刷电路的一部分,该印刷电路还包括用于连接到相关设备的电导体。 可以在邻近电路的输出电压导体的膜上提供接地导体,以减少电路导体之间的泄漏。 在膜的相对面上设置电路板允许导体的电绝缘交叉,以便于电路的布局。
    • 9. 发明授权
    • Electronic piano circuit
    • 电子钢琴电路
    • US3935783A
    • 1976-02-03
    • US486503
    • 1974-07-08
    • William V. MachanianRobert R. Williams
    • William V. MachanianRobert R. Williams
    • G10H1/053G10H1/057G10H5/00H03K4/02H03K6/00G10H1/06G10H5/10
    • G10H1/057
    • The embodiment of the invention disclosed herein is directed to an electronic musical instrument of the keyboard type used to electronically reproduce piano sounds. The circuit has means to vary the amplitude of the piano voice in response to the velocity of the downward movement of the key. Means are provided for producing a fundamental square wave frequency and the second and fourth harmonics thereof, in response to the actuation of a given key on the keyboard. One circuit arrangement includes means for combining the fundamental frequency and the second and fourth harmonics in a predetermined time relation to produce the zero, attack, peak, and decay characteristics of a piano voice as actually produced by a piano string. Amplitude limiting means are coupled to the circuit for controlling the amplitude of the harmonics in response to predetermined values so that mixing of the fundamental frequency and the second and fourth harmonics along predetermined points of the piano voice characteristics curve will more accurately reproduce electronically the sounds of a piano. Another circuit arrangement provides means for rapid recovery of the piano circuit so that the keys can be actuated in rapid succession.
    • 本文公开的本发明的实施例涉及用于电子地再现钢琴声音的键盘类型的电子乐器。 电路具有响应于键的向下移动的速度来改变钢琴声音的幅度的装置。 提供了用于响应于键盘上的给定键的致动而产生基本方波频率及其第二和第四谐波的装置。 一个电路装置包括用于以预定时间关系组合基频和第二和第四谐波以产生由钢琴弦实际产生的钢琴声音的零,攻击,峰值和衰减特性的装置。 幅度限制装置被耦合到电路,用于响应于预定值来控制谐波的幅度,使得沿着钢琴声音特征曲线的预定点的基频和第二和第四谐波的混合将更准确地再现电声中的声音 一架钢琴 另一个电路装置提供了用于钢琴电路的快速恢复的装置,使得键可以快速连续地致动。