Overvoltage detector for an RF switch
First Claim
1. An overvoltage detector for an RF switch comprising circuitry having a detector output that couples to a controller, a body voltage input that couples to a charge pump, and a body voltage output that couples to a body terminal of the RF switch, wherein the circuitry is configured to detect an overvoltage across the RF switch by monitoring body leakage current flowing between the body voltage input and the body voltage output, and upon detecting body leakage current over a predetermined current level, generate an overvoltage signal at the detector output to indicate the overvoltage across the RF switch.
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Accused Products
Abstract
An overvoltage detector for an RF switch is disclosed. The overvoltage detector is made up of circuitry having a detector output that couples to a controller, a body voltage input that couples to a charge pump, and a body voltage output that couples to a body terminal of the RF switch. The overvoltage detector is configured to detect an overvoltage across the RF switch by monitoring body leakage current flowing between the body voltage input and the body voltage output. Upon detecting body leakage current over a predetermined level, the overvoltage detector generates an overvoltage signal at the detector output to indicate an overvoltage across the RF switch.
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Citations
21 Claims
- 1. An overvoltage detector for an RF switch comprising circuitry having a detector output that couples to a controller, a body voltage input that couples to a charge pump, and a body voltage output that couples to a body terminal of the RF switch, wherein the circuitry is configured to detect an overvoltage across the RF switch by monitoring body leakage current flowing between the body voltage input and the body voltage output, and upon detecting body leakage current over a predetermined current level, generate an overvoltage signal at the detector output to indicate the overvoltage across the RF switch.
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8. An overvoltage detector for an RF switch comprising:
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a detector output that couples to a controller; a body voltage input that couples to a charge pump, and a body voltage output that couples to a body terminal of the RF switch; a current sense resistor coupled between the body voltage input and the body voltage output; and a voltage comparator having a first comparator input coupled to the body voltage input and a second comparator input coupled to the body voltage output, and a comparator output coupled to the detector output, wherein the voltage comparator is configured to generate an overvoltage signal at the detector output to indicate an overvoltage condition across the RF switch when a voltage difference between the first comparator input and the second comparator input exceeds a predetermined voltage level as body leakage current exceeds a predetermined current level. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method of detecting an overvoltage on an RF switch comprising:
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providing an overvoltage detector having a detector output that couples to a controller, a body voltage input that couples to a charge pump, and a body voltage output that couples to a body terminal of the RF switch; detecting with the overvoltage detector an overvoltage across the RF switch by monitoring body leakage current flowing between the body voltage input and the body voltage output; and generating an overvoltage signal at the detector output upon detecting body leakage current over a predetermined current level to indicate an overvoltage across the RF switch. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A method for protecting an RF switch from an overvoltage comprising:
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providing an antenna tuner with a tuning input and having an RF signal input coupled to a switch port of the RF switch; providing an overvoltage detector with a detector output, a body voltage input that couples to a charge pump, and a body voltage output that couples to a body terminal of the RF switch; providing a processor having a detector input coupled to the detector output and a tuning output coupled the tuning input of the antenna tuner; detecting an overvoltage across the RF switch by monitoring body leakage current flowing between the body voltage input and the body voltage output; and generating an overvoltage signal at the detector output upon detecting body leakage current over a predetermined current level to indicate an overvoltage across the RF switch; and tuning the antenna tuner by way of the processor to reduce overvoltage on the RF switch upon the processor determining that the overvoltage signal has been generated.
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Specification