(a) Low-noise dual-gate MOSFET VHF amplifier stage and noise figure curve. The Motorola MFE140 shown
incoφorates gate protection Zener diodes, to guard against static electricity discharge damage.
(b) Dual-gate MOSFET VHF amplifier with AGC, with gain reduction curve. Maximum gain 27 (20) db at 60 (200) MHz
with no gain reduction (V^^ at +7.5\J). The Motorola MPF131 provides an AGC range featuring up to 60dB of gain
reduction.
(Reproduced by courtesy of Motorola Inc.)
higher) frequency this
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