Question: Figure shows a "half-RF" architecture, where fLO = f - in/2 [21, 22].
(a) Assume the RF input is an asymmetrically-modulated signal. Sketch the spectra at the first and second IFs if the mixers are ideal multipliers.
(b) Repeat part (a) but assuming that the RF mixer also multiplies the RF signal by the third harmonic of the LO.
(c) The flicker noise of the LNA may be critical here. Explain why.
