POSITIVE FEEDBACK COMMON GATE LOW NOISE AMPLIFIER

摘要

A Positive Feedback Common Gate Low Noise Amplifier, PFCGLNA, has positive feedback transistors (147, 149 ) and input transistors (151, 153) that are of the same conductivity type. Making the positive feedback and input transistors of the same conductivity type reduces sensitivity to process variations. Noise generated by the positive feedback transistors (147, 149 ) is used to cancel noise generated by the input transistors (151, 153). In one embodiment, the PFCGLNA) is tunable to have a substantially constant input impedance for any frequency in a wideband frequency range from 680 MHz to 980 MHz, and has a noise figure less than 2.2 dB over the entire wideband frequency range.