A low-power, low-noise amplifier with a negative feedback loop is provided. A low noise amplifier (LNA) includes a common gate (CG) amplifier, a common source (CS) amplifier having a gate connected to a source of the CG amplifier, a differential current balancer (DCB) connected to an output end of the CG amplifier and an output end of the CS amplifier, a symmetric load connected to the DCB, and a current bleeding circuit with one end connected to the output end of the CS amplifier and another end connected to the symmetric load, the current bleeding circuit including an active element and a load corresponding to the symmetric load, and an output end of the active element is connected to a gate of the CG amplifier.