A High Bandwidth, Low Noise Preamplifier Using Active inductor Load

In this paper, a high-speed preamplifier is designed to be applied in serial link transceiver. The proposed structure has high gain, low power, high bandwidth and low input-referred noise voltage. In addition, this structure is simple and totally on chip. Since this circuit is usually used in the first stage, the noise consideration is very important and must be investigated carefully. The circuits are designed in differential mode to eliminate the differential noise of transmission lines. In order to increase the bandwidth, a capacitor and an active inductor are added to the circuit. The proposed preamplifier is simulated in 180nm CMOS technology. The power consumption of proposed preamplifier is 3.6 mW with 1.8 V power supply. The unity gain frequency of proposed preamplifier is 19.3GHz with a phase margin of 85 degrees. The total equivalent input noise is 718 µv^2/Hz.