Radio frequency signal gain control
AssigneeSiTune Corporation
InventorsSaeid Mehrmanesh, Vahid Mesgarpour Toosi
Life of this patent
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Abstract
An RF receiver is described comprising a common gate common source LNA with a variable resistor in the source of the common gate transistor, a variable resistor in the source of the common source transistor, and a variable resistor in the RF input. A Smart Gain Control varies the resistance in the resistors to produce linear amplification in the LNA while maintaining input matching. Further, a broad dynamic range RSSI is described that implements a feedback control loop to maintain signal power within a sensitivity range of the power detector in the RSSI.
Claims12
A system comprising a common gate common source low-noise am lifter (LNA), the common gate common source LNA further comprising:
- a radio frequency (RF) input;
- a common gate transistor;
- a variable resistor in the drain of the common gate transistor;
- a common source transistor;
- a variable resistor in the drain of the common source transistor;
- a variable resistor in the source of the common gate transistor;
- a variable resistor in the source of the common source transistor;
- and
- a Smart Gain Control configured to change the resistance in the variable resistor in the drain of the common gate transistor, the variable resistor in the drain of the common source transistor, the variable resistor in the source of the common gate transistor, the variable resistor in the source of the common source transistor, and the variable resistor in the RF input based on a control signal conveyed to the Smart Gain Control.
A method comprising:
- varying a resistance level of a variable resistor in the drain of a common gate transistor of a common gate common source low-noise amplifier (LNA);
- varying a resistance level of a variable resistor in the drain of a common source transistor of the common gate common source LNA;
- varying a resistance level of a variable resistor in the source of the common gate transistor of the common gate common source LNA;
- and
- varying a resistance level of a variable resistor in the source of the common source transistor of the common gate common source LNA;
- wherein the resistance of the variable resistors is varied based on a control signal.
A method comprising
- varying a resistance level of a variable resistor in the drain of a common gate transistor of a common gate common source low-noise amplifier (LNA);
- varying a resistance level of a variable resistor in the drain of a common source transistor of the common gate common source LNA;
- varying a resistance level of a variable resistor in the source of the common gate transistor of the common gate common source LNA;
- varying a resistance level of a variable resistor in the source of the common source transistor of the common gate common source LNA;
- varying a resistance level of a variable resistor in an RF input of the common gate common source LNA;
- and
- varying the resistance level of the variable resistor in the RF input of the common gate common source LNA to match an input impedance in the common gate common source LNA.
A method, comprising:
- varying a resistance level of a variable resistor in the drain of a common gate transistor of a common gate common source low-noise amplifier (LNA);
- varying a resistance level of a variable resistor in the drain of a common source transistor of the common gate common source LNA;
- varying a resistance level of a variable resistor in the source of the common gate transistor of the common gate common source LNA;
- and
- varying a resistance level of a variable resistor in the source of the common source transistor of the common gate common source LNA;
- wherein the gain of the common gate common source LNA is increased by performing at least one of:
- increasing the resistance of the variable resistor in the drain of the common source transistor and increasing the resistance of the variable resistor in the drain of the common gate transistor;
- and
- decreasing the resistance of the variable resistor in the source of the common gate transistor and decreasing the resistance of the variable resistor in the source of the common source transistor.
Dependencies are inferred from the claim text.