DESIGN AND ANALYSIS OF TWO STAGE CMOS LNA WITH EXTENDED BANDWIDTH FOR RF APPLICATIONS
1 S.Vijayalakshmi., 2 M.Miriam cathy joy
1 PG student, Department of ECE, Kalasalingam University, Krishnankoil, Tamil Nadu, India.
2 Assistant professor, Dept of ECE, Kalasalingam University, Krishnankoil, Tamil Nadu, India.
In RF communication, high data rate is required which requires large band width. The wireless receiver with an LNA which can amplify the signals for a wide range of frequencies is suitable for these applications. Factors affecting bandwidth of amplifier are stray capacitance &inductance in circuit, gain bandwidth product, Cut off frequency, Noise. Existing technology to improve bandwidth includes inductance peaking, Capacitance peaking, Feedback technique, Negative miller capacitance and transimpedance amplifier. The objective of this work is to design two-Stage CMOS Low Noise Amplifier (LNA) using active feedback techniques. The gain, unity gain bandwidth, linearity of the proposed circuit is analysed Active feedback is a Negative feedback in op-amp to reduce distortion and increase high frequency response. In this topology, one transistor is connected below another in cascode fashion. To simulate the proposed circuit, we use ADS (advanced design system)tool as it is suitable for high frequency application.
