A low power broadband K-band low noise amplifier

In this paper, we present a low power, wideband low noise amplifier. Transformer feedback technique is used for input matching and T-type LC network is used for wideband output matching. Moreover, current-reused technique is used to reduce DC power consumption, and DS method is adopted to improve circuit linearity. Finally, with under 3.6 mW DC power consumption, this LNA achieves 10.8 dB peak gain and 6 GHz 3-dB bandwidth at the same time with lowest NF of 4.6 dB. Compared with other references, this design has the lowest DC power consumption and widest bandwidth.

I. Introduction

As CMOS process provides low cost, low power and high integration with digital circuits, more and more RF/microwave components are implemented on CMOS process. In recent years, due to increased bandwidth and data rate requirement. K-band (18–26.5 GHz) is applied on short-distance communications, automotive anti-collision radar and FCMW radar systems [1]. For K-band transceiver applications, low noise amplifier (LNA) is the first component in a receiver. In order to achieve good SNR ratio, high gain, low power and good linearity LNA design is an important issue [2].