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This paper presents a new transformer-feedback technique for RF and millimeter-wave (mmW) low-noise amplifiers (LNAs). The working principle of conventional LNAs using transformers is analyzed to show their underlying performance trade-off between input matching and noise figure (NF). To mitigate this issue, a new feedback technique is developed by constructing a drain-to-gate feedback path around...
A novel transformer feedback featuring wideband input matching and noise cancellation is proposed and demonstrated in a wideband differential LNA for software-defined-radio (SDR) applications. Implemented in 0.13µm CMOS with an area of 0.32mm2, the LNA prototype measures a wideband input matching S11 of less than −10dB from 1.2GHz to 6.6GHz and minimum NF of 1.8dB while consuming 11mA at 1.2V supply.
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