Analog Devices Inc. The HMC158C8 is a miniature frequency doubler MMIC in a non-hermetic ceramic surface mount nonhermetic package. Suppression of undesired fundamental and higher order harmonics is 40 dB typical with respect to input signal level. The doubler uses the same diode/balun technology used in Hittite MMIC mixers, features small size and requires no DC bias.