Technique to reduce the third harmonic of an on-state RF switch
First Claim
1. Circuitry comprising:
- a radio frequency (RF) switch coupled between an input node and an output node and configured to selectively pass an RF signal from the input node to the output node based on a first switching control signal; and
distortion compensation circuitry coupled in parallel with the RF switch between the input node and the output node, the distortion compensation circuitry configured to boost a portion of the RF signal that is being compressed by the RF switch when the amplitude of the RF signal is above a predetermined threshold by selectively injecting current into one of the input node or the output node.
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Abstract
RF switching circuitry includes an RF switch coupled between an input node and an output node. Distortion compensation circuitry is coupled in parallel with the RF switch between the input node and the output node. The RF switch is configured to selectively pass an RF signal from the input node to the output node based on a first switching control signal. The distortion compensation circuitry is configured to boost a portion of the RF signal that is being compressed by the RF switch when the amplitude of the RF signal is above a predetermined threshold by selectively injecting current into one of the input node or the output node. Boosting a portion of the RF signal that is being compressed by the RF switch allows a signal passing through the RF switch to remain substantially linear, thereby improving the performance of the RF switching circuitry.
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Citations
33 Claims
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1. Circuitry comprising:
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a radio frequency (RF) switch coupled between an input node and an output node and configured to selectively pass an RF signal from the input node to the output node based on a first switching control signal; and distortion compensation circuitry coupled in parallel with the RF switch between the input node and the output node, the distortion compensation circuitry configured to boost a portion of the RF signal that is being compressed by the RF switch when the amplitude of the RF signal is above a predetermined threshold by selectively injecting current into one of the input node or the output node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A mobile terminal comprising:
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an antenna; a receiver front end; a radio frequency transmitter section; and antenna tuning circuitry coupled between the antenna, the receiver front end, and the radio frequency transmitter section, the antenna tuning circuitry comprising; a radio frequency (RF) switch coupled between an input node and an output node and configured to selectively pass an RF signal from the input node to the output node based on a first switching control signal; and distortion compensation circuitry coupled in parallel with the RF switch between the input node and the output node, the distortion compensation circuitry configured to boost a portion of the RF signal that is being compressed by the RF switch when the amplitude of the RF signal is above a predetermined threshold by selectively injecting current into one of the input node or the output node. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification