| 摘要 |
<p>A rectifying and integrating circuit, particularly in a knock-detection system for an internal combustion engine, comprises an operational amplifier OA, an integrating capacitor C2 with one side connected to the amplifier output and its other side connected to the signal input of the amplifier, a first rectifying device D2 connecting the amplifier output to the one side (i.e. output side) of the integrating capacitor, and a second rectifying device D1 connecting the amplifier output to its signal input. The signal input current is balanced by feedback through one or other of the two paths D2, C2 and D1, depending on the polarity of the input. Integration occurs on one polarity in the absence of a rectifier amplifier preceding a separate integrator, errors due to input offset voltages of the rectifier amplifier are avoided.</p> |
