Lect7_LNAs I

Lect7_LNAs I - ECE 894 RF and mmWave Front-end Circuit...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
ECE 894 RF and mmWave Front-end Circuit Design Prof. Waleed Khalil Lecture LNAs I 7 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
LNA Design Consideration Noise Figure Directly impact receiver sensitivity Return loss (i.e. S 11 ) Input impedance typically set to 50 to match antenna and feed network Linearity (i.e. P 1dB , IIP 3 and IIP 2 ) Minimize intermediation distortion problems due to blocking signals Gain Reduce noise impact of mixer and subsequent blocks on overall receiver noise figure Isolation Impacts reciprocal mixing and feedback to ANT Stability Power dissipation 2 Input Match Output Match LNA
Background image of page 2
Shunt Input LNA Input impedance of MOS is capacitive Use shunt resistor, R 1 for broadband termination R in ~ R 1 , R 1 = R s = 50 Never used since NF > 6 dB Signal attenuated by factor of 2 R 1 adds thermal noise 3 R L v out V dd R in v s R s R 1
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Shunt Input LNA: Noise Analysis Assume low frequency f << f T Ignore gate noise and drain correlated current noise 4 v n
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This document was uploaded on 01/16/2011.

Page1 / 12

Lect7_LNAs I - ECE 894 RF and mmWave Front-end Circuit...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online