Simulation and Design of Low Noise Amplifier

A low-noise amplifier is an electronic amplifier that amplifies a very poor signal (in terms of its power) without significantly degrading its SNR. An amplifier increases the power of both the signal and the noise present at its input. A good LNA has a low Noise Figure as well as enough gain to boost the signal thereby does the work required of it. This paper proposes a LNA designed with ATF-21170 to operate in 2.4 GHz with a maximum gain of 18.453 dB and minimum NF 1.346

The Design and Modeling of 2.4 GHz and 3.5 GHz MMIC LNA

LNA is an electronic amplifier that is required in receiver systems to increase the amplitude of the very low level signals from the antenna without adding too much noise. Software Advance Design System (ADS) was used to simulate the circuit and design the layout. LNA was designed using cascode topology with feedback techniques which produces better matching and unconditionally stable over the entire desired frequencies. For the 2.4 GHz operation, the amplifier achieves gain of 14.949 dB, noise figure of 1.951 dB and input reflection coefficient of -10.419 dB. With operating voltage supply at 3V, the total current consumption is 13 mA. For 3.5GHz amplifier, gain is 22.985 dB, noise figure is 1.964dB, input reflection coefficient is -12.427 dB and current consumption is 18 mA.

Electronic Acoustic Sensor

The Stethoscope (acoustic sensor) is a fundamental tool for the diagnosis of diseases and conditions of the cardiovascular (CV) system. It serves as the most commonly employed technique for diagnosis of such diseases and conditions in primary health care and in circumstances where sophisticated medical equipment is not available, such as remote areas. The piezoelectric sensor was used as an acoustic sensor. The sensitivity of the sensor was improved more than 20 times with our new design. The signal-to-noise ratio was further improved by using unique sensor housing and by using an electronic amplifier in the differential mode.