NE612

The NE612 was an integrated circuit for processing of signals, such as in the transmission of radio signals. It consists of an oscillator and a mixer.
It could handle signal frequencies of up to 500 MHz and local oscillator frequencies of up to 200 MHz.
The mixer was a “Gilbert cell” multiplier configuration which provides both a gain of 14 dB and a noise figure of at 45 MHz.
The IC belongs to a family of the following ICs: NE602, SA602, NE612 and SA612. It was widely used in amateur radio applications, e.g. in the commercial Elecraft products, and others.