Positive feedback common gate low noise amplifier

A common gate amplifier comprising:

• an input leg including an input transistor of a conductivity type;
• a digitally-programmable tank load coupled to the input leg;
• and
• a positive feedback transistor of the conductivity type, wherein the common gate amplifier has an input impedance, wherein the common gate amplifier receives a multi-bit control value that controls the digitally-programmable tank load, wherein the input impedance is tunable to be substantially constant over a wideband tuning frequency range, wherein the wideband tuning frequency range extends from a lower frequency bound to an upper frequency bound, and wherein the upper frequency bound is at least one and one-third times the lower frequency bound.

A common gate amplifier comprising:

• an input leg including an input transistor of a conductivity type;
• a digitally-programmable tank load coupled to the input leg;
• and
• a positive feedback transistor of the conductivity type, wherein the common gate amplifier has an input impedance, wherein the common gate amplifier receives a multi-bit control value that controls the digitally-programmable tank load, wherein the input impedance is tunable to be substantially constant over a wideband tuning frequency range, wherein the wideband tuning frequency range extends from a lower frequency bound to an upper frequency bound, and wherein the upper frequency bound is at least one and one-third times the lower frequency bound, and further wherein the common gate amplifier has a Noise Figure (NF) throughout the wideband tuning frequency range less than 2.2 dB.

A common gate amplifier comprising:

• an input leg including an input transistor of a conductivity type;
• a digitally-programmable tank load coupled to the input leg;
• and
• a positive feedback transistor of the conductivity type, wherein the common gate amplifier is operable over a wideband tuning frequency range, wherein the wideband tuning frequency range extends from a lower frequency bound to an upper frequency bound, wherein the upper frequency bound is at least one and one-third times the lower frequency bound, and wherein the common gate amplifier has a Noise Figure (NF) throughout the wideband tuning frequency range less than 2.2 dB.

A common gate amplifier comprising:

• an input leg including an input transistor of a conductivity type;
• a digitally-programmable tank load coupled to the input leg;
• and
• a positive feedback transistor of the conductivity type,
• an input signal conductor coupled to a source of the input transistor;
• and
• an output signal conductor coupled to the digitally-programmable tank load, wherein the positive feedback transistor has a drain coupled to the output signal conductor, wherein the positive feedback transistor has a source coupled to the input signal conductor, and wherein the positive feedback transistor has a gate that is capacitively coupled to the output signal conductor.

A common gate low noise amplifier, comprising:

• a first input signal conductor;
• a second input signal conductor;
• a first input leg including a first input transistor of a conductivity type and a first cascode transistor, wherein a gate of the first input transistor is capacitively coupled to the second input signal conductor;
• a second input leg including a second input transistor of the conductivity type and a second cascode transistor, wherein a gate of the second input transistor is capacitively coupled to the first input signal conductor;
• a digitally-programmable tank load having a first lead coupled to a drain of the first cascode transistor, and having a second lead coupled to a drain of the second cascode transistor;
• a first positive feedback transistor of the conductivity type, wherein a gate of the first positive feedback transistor is capacitively coupled to the drain of the first cascode transistor, and wherein a source of the first positive feedback transistor is coupled to a source of the first input transistor;
• and
• a second positive feedback transistor of the conductivity type, wherein a gate of the second positive feedback transistor is capacitively coupled to the drain of the second cascode transistor, and wherein a source of the second positive feedback transistor is coupled to a source of the second input transistor.