Fine trimming of a radio frequency gain by modulating the periphery of a radio frequency switch
AssigneeSkyworks Solutions, Inc.
InventorGuillaume Alexandre Blin
Life of this patent
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Abstract
A switched attenuator comprising a radio frequency input, a radio frequency output and an attenuation cell connected between the RF input and the RF output. The attenuation cell includes a variable switch with a variable on-resistance (Ron).
Claims20
A switched attenuator comprising:
- a radio frequency (RF) input;
- an RF output;
- and
- an attenuation cell connected between the RF input and the RF output and including a variable switch with a variable on-resistance, the variable switch including a first field-effect transistor (FET) having a first independently trimmed periphery and a second FET having a second independently trimmed periphery different than the first independently trimmed periphery, each of the first and second FETs being a single FET, the variable switch being configured to enable the first FET and disable the second FET in a first mode of operation and enable the second FET and disable the first FET in a second mode of operation to fine-tune the variable on-resistance of the variable switch.
A method of controlling a switched attenuator comprising a radio frequency (RF) input, an RF output, and an attenuation cell connected between the RF input and the RF output and including a variable switch with a variable on-resistance, the method comprising fine-tuning the variable on-resistance of the variable switch, the fine-tuning including
- enabling a first FET of the variable switch having a first independently trimmed periphery and disabling a second FET of the variable switch having a second independently trimmed periphery different than the first independently trimmed periphery in a first mode of operation, and
- disabling the first FET and enabling the second FET in a second mode of operation, each of the first and second FETs being a single FET.
A mobile device including a switched attenuator comprising:
- a radio frequency (RF) input;
- an RF output;
- and
- an attenuation cell connected between the RF input and the RF output and including a variable switch with a variable on-resistance, the variable switch including a first field-effect transistor (FET) having a first independently trimmed periphery and a second FET having a second independently trimmed periphery different than the first independently trimmed periphery, each of the first and second FETs being a single FET, the variable switch being configured to fine-tune the variable on-resistance of the variable switch, the fine-tuning including
- enabling the first FET and disabling the second FET in a first mode of operation, and
- disabling the first FET and enabling the second FET in a second mode of operation.
Dependencies are inferred from the claim text.