tailieunhanh - Lecture Radio Communication Circuits: Chapter 3 & 4 - Đỗ Hồng Tuấn

Lecture "Radio Communication Circuits: Chapter 3 & 4" presents the following contents: Low Noise Amplifier (LNA), Noise in Bipolar Transistors, Frequency Conversion Circuits (Mixers). Invite you to consult. | Chapter 3 Low Noise Amplifier LNA Dept. of. Telecomm. Eng. _____ Faculty of EEE CSD2013 DHT HCMUT References 1 J. Rogers C. Plett Radio Frequency Integrated Circuit Design Artech House 2003. 2 W. A. Davis K. Agarwal Radio Frequency Circuit Design John Wiley Sons 2001. 3 F. Ellinger RF Integrated Circuits and Technologies Springer Verlag 2008. Dept. of. Telecomm. Eng. _____ Faculty of EEE CSD2013 DHT HCMUT 2 Origin of Noise 1 Resistor thermal noise Probably the most well known noise source is the thermal noise of a resistor also called Johnson noise . It is generated by thermal energy causing random electron motion. It is white noise since the PSD of the noise signal is flat throughout the frequency band. The noise is also called Gaussian which means the amplitude of the noise signal has random characteristics with a Gaussian distribution. We are able to apply statistic measures such as the mean square values. The noise power is proportional to absolute temperature. The thermal noise spectral density in a resistor is given by Mesistor kTR where k is Boltzmann s constant X 10-23 J K Tis the absolute temperature in Kelvin temperature of the resistor and R is the value of the resistor. Dept. of. Telecomm. Eng. _____ Faculty of EEE CSD2013 DHT HCMUT