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    • 4. 发明授权
    • Variable capacitance element controllable by a D.C. voltage
    • 可变电容元件可由直流电压控制
    • US4721985A
    • 1988-01-26
    • US750478
    • 1985-07-01
    • Dimitrios PavlidisErhard KohnErnesto PereaJohn Magarshack
    • Dimitrios PavlidisErhard KohnErnesto PereaJohn Magarshack
    • H01L29/93H01L29/40H01L29/20H01L29/48
    • H01L29/93
    • The invention relates to a variable capacitance element operating in the ultra-high frequency range. In order to integrate this element on to an integrated circuit chip, the element is designed so that the control voltage does not interfere with the ultra-high frequency signal and has neither filters nor shock chokes which are not integrable. The element according to the invention utilizes the junction capacitances variation of at least one diode, reverse-biased by a voltage across a resistor, the high frequency signal being at the diode anode. The element construction comprises an active zone in a semiinsulating substrate. Two metallizations partly cover the active zone and form therewith at least one diode. A projection to the active zone forms the resistor, to which is applied the control voltage. The diodes are p-n junctions of schottky diodes. The semiconductor material is Si or from the III-V group. Application to oscillators, filters, phase shifters, etc. in ultra-high frequency equipment.
    • 本发明涉及在超高频范围内工作的可变电容元件。 为了将该元件集成到集成电路芯片上,元件被设计成使得控制电压不干扰超高频信号,并且既不具有滤波器也不具有不可积分的抗冲击电抗器。 根据本发明的元件利用由电阻器两端的电压反向偏置的至少一个二极管的结电容变化,高频信号在二极管阳极处。 元件结构包括半绝缘衬底中的活性区。 两个金属化部分地覆盖有源区并与其形成至少一个二极管。 对有源区的投影形成电阻,施加控制电压。 二极管是肖特基二极管的p-n结。 半导体材料是Si或III-V族。 应用于超高频设备中的振荡器,滤波器,移相器等。