RF

In an RF context, a mixer is a device which “mixes” two frequencies, producing the sum and difference of said frequencies at its output. In the time domain it works as a multiplier, multiplying both input signals. There are several circuits capable of behaving as mixers, this article will cover the design and behavior of a mixer using a Gilbert Cell encapsulated in a MC1496 IC. This post assumes previous knowledge of the MC1496 and its applications....

The MC1496 is a Balanced Modulator/Demodulator, capable of producing amplitude modulated signals. Its internal structure resembles a Gilbert Cell biased by two current sources (one for each leg of the circuit), both of them being biased by a single diode with a 500 Ohm resistor. MC1496 - Internal Schematic The internal schematic was gathered from Application AN531 from onsemi which is a great resource for in-depth explanations on proper usage of the IC....