What are analogue multipliers and dividers? 

Analogue multipliers and dividers are semiconductor devices which are typically used in circuits to combine two analogue signals into a single one. Thus, the output becomes the product of both the inputs in analogue multipliers and dividers. However, the input signals must be identical in their voltage and scale in a true analogue multiplier and divider. 

Types

Analogue multipliers and dividers come in different varieties, their type determined by the number of quadrants used. The number of quadrants usually varies between one, two and four. Typically, analogue multipliers with one and two quadrants have similar circuitry, and hence are the default types in applications that do not particularly demand four quadrants. As such, the types of analogue multipliers and dividers are:

• Single quadrant multipliers: These types of analogue multipliers and dividers are used when a single polar signal is used, either positive or negative.
• Two quadrant multipliers: These types of analogue multipliers and dividers feature one unipolar signal and another signal of either polarity. 
• Four quadrant multipliers: These types of analogue multipliers and dividers are capable of eliminating unwanted signals. 

Uses of analogue multipliers and dividers

Analogue multipliers and dividers are used in a multitude of electronic devices and circuits, including: 

• Industrial control systems
• Radars
• Frequency mixers
• Signal processing systems 
• Test and measurement equipment 
• Modulators and demodulators
• Voltage-controlled oscillators and filters