Voltage swing indicator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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The device, the circuit of which is presented above, works according to the following principle: the capacitor C is charged by the maximum value of the input signal swing during the measurement process, which ends with a discharge through the transistor T2. Transistor T1 provides the bias current for the second operational amplifier. Diode D1 prevents the first op-amp from saturating, which can happen when the input voltage is less than the voltage across capacitor C.
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