Gate drivers for stacked transistor amplifiers
First Claim
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1. A method for biasing a transistor stack, the method comprising:
- during a first mode of operation of the transistor stack, coupling gates of transistors of the stack, except an input transistor of the transistor stack, to low impedance nodes;
during a second mode of operation of the transistor stack, coupling said gates to high impedance nodes; and
based on the coupling during the first mode and the coupling during the second mode, providing a biasing voltage to each of said gates that is substantially same during both the first and second modes of operation, thereby obtaining a substantially same voltage distribution of a voltage across the transistor stack during said first and second modes of operation.
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Abstract
Various methods and circuital arrangements for biasing one or more gates of stacked transistors of an amplifier are possible where the amplifier is configured to operate in at least an active mode and a standby mode. Circuital arrangements can reduce bias circuit and stacked transistors standby current during operation in the standby mode and to reduce impedance presented to the gates of the stacked transistors during operation in the active mode while maintaining voltage compliance of the stacked transistors during both modes of operation.
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Citations
18 Claims
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1. A method for biasing a transistor stack, the method comprising:
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during a first mode of operation of the transistor stack, coupling gates of transistors of the stack, except an input transistor of the transistor stack, to low impedance nodes; during a second mode of operation of the transistor stack, coupling said gates to high impedance nodes; and based on the coupling during the first mode and the coupling during the second mode, providing a biasing voltage to each of said gates that is substantially same during both the first and second modes of operation, thereby obtaining a substantially same voltage distribution of a voltage across the transistor stack during said first and second modes of operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A circuital arrangement comprising:
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a transistor stack configured to operate as an amplifier, the transistor stack comprising a plurality of stacked transistors comprising an input transistor and an output transistor; and a biasing circuit coupled to one or more gates of the plurality of stacked transistors via respective one or more switches, wherein the circuital arrangement is configured to operate in at least a first mode and a second mode of operation, wherein during the first mode of operation, the one or more switches couple the one or more gates to low impedance nodes of the biasing circuit to provide respective biasing voltages, and wherein during the second mode of operation, the one or more switches couple the one or more gates to high impedance nodes of the biasing circuit to provide respective biasing voltages that are substantially same as the respective biasing voltages provided during the first mode of operation. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification