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    • 3. 发明授权
    • Field effect transistor having saturated drain current characteristic
    • 具有饱和漏极电流特性的场效应晶体管
    • US5585654A
    • 1996-12-17
    • US782789
    • 1991-10-24
    • Jun-ichi Nishizawa
    • Jun-ichi Nishizawa
    • G11B3/12H01L29/10H01L29/772H01L29/808
    • G11B3/128H01L29/1066H01L29/7722
    • A field effect transistor has the property that the product of its series resistance and its true transconductance is less than one throughout the entire range of drain voltage in the operative state of the transistor, the series resistance being the sum of the resistance from source to channel and the resistance of this channel. In order to prevent an excessive increase in the active resistance of the channel, the channel is made to have an impurity concentration as low as less than 10.sup.15 atoms/cm.sup.3, preferably less than 10.sup.14 atoms/cm.sup.3, so that the depletion layers extending from the gates grow extensively to become contiguous in response to a small increase in the reverse gate voltage applied. As a result, the field effect transistor of this invention has an unsaturated drain current versus drain voltage characteristic.
    • 场效应晶体管具有在晶体管的工作状态下,其串联电阻与其真正跨导的乘积在整个漏极电压范围内小于1的特性,串联电阻是源极与沟道之间的电阻之和 和这个渠道的阻力。 为了防止通道的有效电阻的过度增加,使沟道的杂质浓度低至1015原子/ cm3,优选小于1014原子/ cm3,从而从 栅极响应于施加的反向栅极电压的小的增加而广泛地生长以变得连续。 结果,本发明的场效晶体管具有不饱和漏极电流对漏极电压特性。
    • 9. 发明授权
    • Semiconductor switching device
    • 半导体开关装置
    • US4985738A
    • 1991-01-15
    • US939259
    • 1986-12-05
    • Jun-ichi NishizawaTadahiro Ohmi
    • Jun-ichi NishizawaTadahiro Ohmi
    • H01L29/739
    • H01L29/7392
    • A semiconductor thyristor of the Static Induction type having a split-gate structure, e.g., driving gates and non-driving gates, for controlling cathode-anode current flow. The split-gate structure comprises a plurality of primary gates formed in recesses of the channel region which respond to an external control signal for providing primary current control, and a plurality of secondary non-driving gates which are influenced by electric fields in the channel region extant during thyristor operation for providing secondary current control. In operation, the driving and non-driving gates coact so that the non-driving gates, having an induced potential lower than the potential applied to the driving gates, absorb charge carriers injected in the channel during thyristor operation. The relative disposition of the non-driving gates and the anode, as well as the respective doping concentrations of the anode and channel regions, enable the non-driving gates to absorb a substantial portion of charge carriers injected from the anode into the channel during high-power operation. Fast turn-on and turn-off is achieved by exclusion of the non-driving gate capacitance in the driving gate circuit.
    • 具有用于控制阴极 - 阳极电流的具有分离栅极结构(例如驱动栅极和非驱动栅极)的静态感应型的半导体晶闸管。 分离栅极结构包括形成在沟道区的凹部中的多个主栅极,其响应于用于提供初级电流控制的外部控制信号,以及受到沟道区域中的电场影响的多个次级非驱动栅极 在晶闸管操作期间提供二次电流控制。 在操作中,驱动和非驱动栅极共同作用,使得具有低于施加到驱动栅极的电位的感应电位的非驱动栅极在晶闸管操作期间吸收在沟道中注入的电荷载流子。 非驱动栅极和阳极的相对配置以及阳极和沟道区域的各自的掺杂浓度使得非驱动栅极能够在高的期间吸收从阳极注入到沟道中的大部分电荷载流子 电力操作。 通过排除驱动门电路中的非驱动栅极电容来实现快速导通和关断。