Output stage of a power amplifier having a switched-bulk biasing and adaptive biasing
First Claim
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1. A power amplifier system comprising:
- a radio frequency signal path comprising a plurality of cascaded gain stages of which at least one gain stage has a cascode configuration; and
a switching bias network to control the potential of a bulk terminal of at least one metal-oxide semiconductor field effect transistor in the at least one gain stage having the cascode configuration, the switching bias network being controlled to provide different potentials to the bulk terminal.
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Abstract
A power amplifier (PA) using switched-bulk biasing to minimize the risk of output stage snapback effect is disclosed. An adaptive biasing of the output stage prevents device breakdown while accommodating large voltage swings. These protection techniques can be applied to all types of cascode configurations of a PA, including single-ended, differential, quadrature, segmented and any combination thereto.
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Citations
15 Claims
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1. A power amplifier system comprising:
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a radio frequency signal path comprising a plurality of cascaded gain stages of which at least one gain stage has a cascode configuration; and a switching bias network to control the potential of a bulk terminal of at least one metal-oxide semiconductor field effect transistor in the at least one gain stage having the cascode configuration, the switching bias network being controlled to provide different potentials to the bulk terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A power amplifier system comprising:
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a radio frequency signal path comprising a plurality of cascaded gain stages of which at least one gain stage has a cascode configuration; and a variable gate biasing network having its voltage dependent on an output voltage of the power amplifier system, the variable gate biasing network coupled to a gate of a metal-oxide semiconductor field effect transistor of the at least one gain stage having the cascode configuration, wherein the variable gate biasing network is configured to provide a biasing voltage at the gate of the metal-oxide semiconductor field effect transistor such that the relationship of a gate voltage of the metal-oxide semiconductor field effect transistor to the output voltage of the power amplifier system is non-linear. - View Dependent Claims (10, 11, 12, 13)
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14. A power amplifier system comprising:
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a radio frequency signal path comprising a plurality of cascaded gain stages of which at least one gain stage has a cascode configuration; a phase shift unit coupled to an output of at least one of the plurality of cascaded gain stages to provide a phase shift unit radio frequency output that is phase shifted with respect to a radio frequency signal in the radio frequency signal path; and a switching bias network to control the potential of a bulk terminal of at least one metal-oxide semiconductor field effect transistor in the at least one gain stage having the cascode configuration, the switching bias network being coupled to an output of the phase shift unit to provide different potentials to the bulk terminal responsive to the output of the phase shift unit. - View Dependent Claims (15)
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Specification