This pin is held at 6.0 volts and is a current input. The feedforward input, Vff, is pin 8 and its value is squared before being fed into the divider input of the multiplier. The Iset current from pin 12 is also used in the multiplier to limit the maximum output current

заранее спасибо

Без контекста возможны оба варианта (спрямление сигнала и возведение в квадрат).
Из общего контекста ясно, что в данном случае аналоговый сигнал возводится в квадрат.
Надо просто просмотреть употребление термина по всему тексту.

Figure 3 shows a squarer and a divider as well as
a multiplier in the voltage loop. The output of the
voltage error amplifier is divided by the square of
the average input voltage before it is multiplied by
the rectified input voltage signal. This extra circuitry
keeps the gain of the voltage loop constant,
without it the gain of the voltage loop would change
as the square of the average input voltage. The average
value of the input voltage is called the feedforward
voltage or Vff since it provides an open
loop correction which is fed forward into the voltage
loop. It is squared and then divided into the
voltage error amplifier output voltage (Vvea).