Low Noise Amplifiers (LNAs) are commonly used to amplify signals that are too weak for direct processing for example in radio or cable receivers. Traditionally, low noise amplifiers are implemented via tuned amplifiers, exploiting inductors and capacitors in resonating LC-circuits. This can render very low noise but only in a relatively narrow frequency band close to resonance. There is a clear trend to use more bandwidth for communication, both via cables (e.g. cable TV, internet) and wireless links (e.g. satellite links and Ultra Wideband Band). Hence wideband low-noise amplifier techniques are very much needed.
Wideband Low Noise Amplifiers Exploiting Thermal Noise Cancellation explores techniques to realize wideband amplifiers, capable of impedance matching and still achieving a low noise figure well below 3d B. This can be achieved with a new noise cancelling technique as described in this book. By using this technique, the thermal noise of the input transistor of the LNA can be cancelled while the wanted signal is amplified! The book gives a detailed analysis of this technique and presents several new amplifier circuits.
This book is directly relevant for IC designers and researchers working on integrated transceivers. Although the focus is on CMOS circuits, the techniques can just as well be applied to other IC technologies, e.g. bipolar and Ga As, and even in discrete component technologies.
Table des matières
Preface.- 1. Introduction.- 2. Systematic Generation of All Elementary Wide-Band Amplifiers.- 3. 2-MOST Amplifiers: Analysis and Design.- 4. Wide-Band Low-Noise Techniques.- 5. Design of a Decade Bandwidth Noise Cancelling CMOS LNA.- 6. Summary and Conclusions.- Appendix A: Two-port Amplifiers Stability and {A, B, C, D} Parameters.- Appendix B: Biasing noise in Noise-cancelling Amplifiers.- Appendix C: Two-port Amplifiers Noise and Power Matching.- Appendix D: All 1- and 2-VCCS Graphs.- Index.- Author Biographies.
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