Скачать или смотреть Squaring Function Circuit Design Explained with Temperature Compensation

How to design an accurate squaring function circuit that raises the input voltage to the power of two is explained in this video. It is shown that the output voltage of the circuit is proportional to the square of the input voltage. As explained the circuit is designed using two operational amplifiers and four bipolar junction transistors or BJTs. Examples of proper choices for op amps are discussed including the Texas Instruments' OPA165x Ultra-Low-Noise, Low-Distortion, FET-Input dual Op Amp package, or Analog Devices AD8092 dual op amp package. For the BJT transistors, they need to be at least dual matched as explained in the video. But a quad matched BJT package like MAT14 from Analog Devices is highly recommended. The design explained in this video is streamlined by setting nearly all resistor values to 100 kilo Ohm with 1% tolerance as explained in the video. A combination of Kirchhoff Voltage Law (KVL) and Shockley PN Junction equation is used to analyzed the circuit and show that this circuit accurately computes the square of the input voltage. The temperature compensation scheme implemented in this circuit is explained as well to show that the circuit has reduced sensitivity to temperature variation.