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发明公开
CN106788369A 具有改进偏置电路的射频开关电路 无效 - 驳回

具有改进偏置电路的射频开关电路
摘要：
本发明揭露了一种具有改进偏置电路的射频开关电路，其包括：第一射频端、第二射频端、第一电容、第二电容；射频开关，其包括源极、漏极、栅极以及体端，源极经过第一电容与第一射频端耦接，漏极经过第二电容与第二射频端耦接，偏置电路，其基于电池电压提供第一偏置电压、第二偏置电压和第三偏置电压，第一偏置电压大于第二偏置电压，第二偏置电压大于第三偏置电压，其中，第二偏置电压被耦接至射频开关的源极以及漏极，在需要控制所述射频开关导通时，第一偏置电压被耦接至射频开关的栅极，第二偏置电压被耦接至射频开关的体端，在需要控制射频开关截止时，第三偏置电压被耦接至射频开关的栅极和体端。这样可以节省芯片面积，降低成本。
摘要（英）：

The invention discloses a radio frequency switch circuit with an improved bias circuit. The radio frequency switch circuit comprises a first radio frequency end, a second radio frequency end, a first capacitor, a second capacitor, a radio frequency switch and the bias circuit; the radio frequency switch comprises a source electrode, a drain electrode, a grid electrode and a body end, the source electrode is coupled with the first radio frequency end through the first capacitor, and the drain electrode is coupled with the second radio frequency end through the second capacitor; the bias circuit provides a first bias voltage, a second bias voltage and a third bias voltage on the basis of a battery voltage, the first bias voltage is higher than the second bias voltage, and the second bias voltage is higher than the third bias voltage, wherein the second bias voltage is coupled to the source electrode and the drain electrode of the radio frequency switch; and when the radio frequency switch needs to be controlled to be switched on, the first bias voltage is coupled to the grid electrode of the radio frequency switch, the second bias voltage is coupled to the body end of the radio frequency switch, and when the radio frequency switch needs to be controlled to be switched off, the third bias voltage is coupled to the grid electrode and the body end of the radio frequency switch. Accordingly, the chip area can be decreased, and the cost can be reduced.

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