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在模拟电路设计中,利用往往被人忽略的负电阻,可以简化设计、提高精度、降低成本.比如本文所述用负电阻线性化RTD(Resistance Temperature Detector)温度传感器并去除不期望的互连线寄生电阻.设计一个精确的负电阻并不复杂,可以把一个正电阻放在.一个运放的反馈回路上来精确地构成负电阻.如图1,为得到一个(-R)Ω的负电阻,把一个阻值为RΩ的电阻放在运放输出端至正输入端的反馈回路上,两个10kΩ构成的网络使运放正输入增益维持2V/V.Vin增加1V,则Vout将增加 2V,R上的电流将增加-1(V)/RΩ安培,电路特性等效于一个(一R)Ω的电阻.
In analog circuit design, often neglected negative resistance, can simplify the design, improve accuracy, reduce costs.As described in this article with a negative resistance linearization RTD (Resistance Temperature Detector) temperature sensor and remove the unwanted interconnect Parasitic resistance. Designing a precise negative resistance is not complicated, and a positive resistance can be placed on a feedback loop of an op amp to accurately form a negative resistance. To obtain a negative resistance of (-R) Ω as shown in Figure 1, Place a resistor of RΩ in the feedback loop from the op amp output to the positive input. Two 10 kΩ networks allow the positive input gain of the op amp to be maintained at 2 V / V. When Vin increases by 1 V, Vout increases by 2 V, R The current on it will increase by -1 (V) / RΩ Amperes and the circuit characteristics are equivalent to one (one R) Ω resistor.