A sub 1-V L-band low noise amplifier in SOICMOS
This paper describes a sub 1-V low noise amplifier (LNA) fabricated using a 0.35 mu m SOI (silicon on insulator) CMOS process. The SOI devices have high speed performance even at low operating voltage (below 1 V) because of their smaller parasitic capacitance at source and drain than those of hulk MOSs. A body of a MOSFET can be controlled by using a field shield (FS) plate. The transistor body of the LNA is connected to its gate. The threshold voltage of the transistor becomes lower due to the body-biased effect so that a large drain current keeps the gain high, and active-body control improves the 1-dB gain compression point. A gain of 7.0 dB and a Noise Figure (NF) of 3.6 dB are obtained at 1.0 V and 1.9 GHz. The output power at the 1-dB gain compression point is + 1.5 dBm. The gain and the output power at the 1-dB gain compression point are higher by 1.2 dB and 2.9 dB respectively than those of a conventionally body-fixed LNA. A 5.5 dB gain is also obtained at the supply voltage of 0.5 V.
low noise amplifier soicmos l band low voltage rf