发明名称 |
Circuit with a voltage dependent resistor for controlling an on/off state of a transistor |
摘要 |
An H-bridge circuit formed from two sub-circuits coupled to each other by a load network across a respective load node of each of the sub-circuits. Each sub-circuit of the two sub-circuits comprises a depletion mode upper transistor with a second electrode coupled to a first electrode of a lower transistor. The load node of the sub-circuit is disposed between the second electrode of the upper transistor and the first electrode of a lower transistor. There is a first voltage supply node coupled to a first electrode of the upper transistor and a second voltage supply node is coupled to a second electrode of the lower transistor. An upper driver transistor selectively couples a gate electrode of the upper transistor to an upper drive voltage node, the upper driver transistor having a control electrode coupled to an upper switched voltage supply circuit. There is also a lower switched voltage supply circuit coupled to a gate electrode of the lower transistor and a voltage dependent non-linear resistor is coupled across the gate electrode and second electrode of the upper transistor. In use, when the lower transistor and upper driver transistor are in a non-conductive state a potential difference across the voltage dependent non-linear resistor is sufficiently small enough to control the upper transistor into a conductive state. Conversely, when the lower transistor and upper driver transistor are in a conductive state the potential difference across the voltage dependent non-linear resistor provides a negative bias to the gate electrode of the upper transistor that has a negative potential sufficient to control the upper transistor into a non-conductive state. |
申请公布号 |
US8149027(B2) |
申请公布日期 |
2012.04.03 |
申请号 |
US20080166882 |
申请日期 |
2008.07.02 |
申请人 |
CYGAN LAWRENCE F.;KHAN ANDREW M.;WILLIAMS CURTIS M.;MOTOROLA MOBILITY, INC. |
发明人 |
CYGAN LAWRENCE F.;KHAN ANDREW M.;WILLIAMS CURTIS M. |
分类号 |
H03K3/00 |
主分类号 |
H03K3/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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