Signal integrating circuit

Details Signal integrating circuit Signal integrating circuit

1987-11-24

1989-04-11

Argenbright, Tony M.

Internal-combustion engines

Combustion chamber means combined with air-fuel mixture...

73 35, F02P 5155

Patent

active

048196002

ABSTRACT:
A rectifying and integrating circuit, particularly in a knock-detection system for an internal combustion engine, comprises an operational amplifier, an integrating capacitor with one side connected to the amplifier output and its other side connected to the signal input of the amplifier, a first rectifying device connecting the amplifier output to the one side (i.e. output side) of the integrating capacitor, and a second rectifying device connecting the amplifier output to its signal input. The signal input current is balanced by feedback through either the first rectifying device and the capacitor or through the other rectifying device, 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.

REFERENCES:
patent: 4351282 (1982-09-01), Utsumi et al.
patent: 4458646 (1984-07-01), Suzuki et al.

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