Inductorless self-tuned input-matching low-noise amplifier with very low noise figure and Gm boost
AssigneeQorvo US, Inc.
InventorMostafa Savadi Osgooei
Life of this patent
Estimating the term…
Abstract
A low-noise amplifier is disclosed having a first transistor with a first current terminal coupled to a supply voltage rail through a load resistor and a second current terminal coupled to an input node, wherein a bias resistor is coupled between the input node and a fixed voltage node. A second transistor has a third current terminal coupled to an output node and a fourth current terminal coupled to the fixed voltage node. A feedback capacitor is coupled between the input node and the output node, wherein capacitance of the feedback capacitor is sized to eliminate the need for coupling an input impedance matching inductor to the input node.
Claims27
A low-noise amplifier comprising:
- a first transistor having a first current terminal coupled to a supply voltage rail through a load resistor and a second current terminal coupled to an input node, wherein a bias resistor is coupled between the input node and a fixed voltage node;
- a second transistor having a third current terminal coupled to an output feedback node and a fourth current terminal coupled to the fixed voltage node;
- a third transistor having a gate coupled to the first current terminal of the first transistor, a fifth current terminal coupled to the output feedback node, and a sixth current terminal coupled to the fixed voltage node;
- and
- a feedback capacitor coupled between a gate of the first transistor and the output feedback node, wherein capacitance of the feedback capacitor is sized to eliminate the need for coupling an input impedance matching inductor to the input node.
A method of amplifying a low-noise signal using a low-noise amplifier having a first transistor having a first current terminal coupled to a supply rail through a load resistor and a second current terminal coupled to an input node, a bias resistor coupled between the input node and a fixed voltage node, a second transistor having a third current terminal coupled to an output feedback node and a fourth current terminal coupled to the fixed voltage node, a third transistor having a gate coupled to the first current terminal of the first transistor, a fifth current terminal coupled to the feedback output node, and a sixth current terminal coupled to the fixed voltage node, and a feedback capacitor between a gate of the first transistor and the output feedback node, the method comprising:
- applying a signal to the input node without employing an input matching inductor at the input node;
- and
- amplifying the signal using the first transistor and the second transistor, thereby generating an amplified output signal at the output feedback node.
A wireless communication device comprising:
- receive circuitry configured to receive radio frequency (RF) signals, wherein the receive circuitry comprises a low-noise amplifier configured to amplify the RF signals;
- and
- the low-noise amplifier comprising:
- a first transistor having a first current terminal coupled to a supply voltage rail through a load resistor and a second current terminal coupled to an input node, wherein a bias resistor is coupled between the input node and a fixed voltage node;
- a second transistor having a third current terminal coupled to an output feedback node and a fourth current terminal coupled to the fixed voltage node;
- a third transistor having a gate coupled to the first current terminal of the first transistor, a fifth current terminal coupled to the output feedback node, and a sixth current terminal coupled to the fixed voltage node;
- and
- a feedback capacitor coupled between a gate of the first transistor and the output feedback node, wherein capacitance of the feedback capacitor is sized to eliminate the need for coupling an input impedance matching inductor to the input node.
Dependencies are inferred from the claim text.