This　paper　investigates　the　impact　of　high　frequency　noise　correlation　on　SiGe　HBT　LNA　design.　With　correlation,　simultaneous　noise　and　impedance　match　is　found　to　continue　to　hold　approximately.　However,　a　larger　size　and　hence　a　higher　biasing　current　are　required　for　noise　matching.　The　actual　noise　figure　(NF)　of　LNAs　designed　without　considering　noise　correlation　is　also　investigated.　Further　investigation　shows　that　a　size　considerably　smaller　than　noise　matching　size　is　more　preferable,　as　it　produces　high　gain,　high　linearity　and　NF　only　slightly　higher　noise　figure　at　much　smaller　power　consumption.　©　2012　IEEE.