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I am studying Advance electronics subject and i came across topics one quadrant multiplier and four quadrant multiplier. What i can't understand is that how one quadrant multiplier can operate on only when both inputs are positive (eg: +2 and +1 ) but cannot operate when input voltages are both negative and opposite polarity (+-, -+, --) and four quadrant multiplier can operate on all four possible input values (++, -+ ,+-, --). I will be very happy for your explanation. Thank you. [Four quadrant multiplierone quadrant multiplier](https://i.stack.imgur.com/Bkg2H.jpg)

I just don't understand how one quadrant multiplier cannot operate when inputs are +-, -+ or --. I just want explanation how it cannot operate on these values and also how four quadrant multiplier can operate on those values.

Rajesh Raskoti
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