Article ID: 23.20260309
This letter presents an inductorless wideband low-noise amplifier for broadband weak-signal readout front-ends. To achieve broadband input matching and low-noise operation without using inductors, the proposed architecture combines a gm-boosted common-gate input stage with a feedforward noise-canceling path. A fully differential gain stage and a voltage-combining output buffer are also employed to support differential back-end processing and provide sufficient overall gain. The prototype is implemented in 65-nm CMOS with a 1-V supply, consuming 9.6 mW and occupying a core area of 0.044 mm2. Measurement results show a peak gain of 32.5 dB with a −3 dB bandwidth of 0.4–2.2 GHz and a noise figure of 2.6–3.1 dB.
