Design and performance of wideband coaxial passive integrator

The equivalent circuit of passive integrator has been established and simulated considering its stray parameters. The higher frequency restriction of the integrator is found to be determined by the stray inductance from integral capacitor and the stray capacitance from integral resistor, whose influence grows as the RC time constant increases, for integrators of the same structure. Coaxial structure can reduce the stray inductance from integral capacitor and thus enlarge the bandwidth of the integrator. A coaxial passive integrator with the RC time constant of 10 μs has been designed and fabricated. Frequency response tests show that, its operation band ranges from 50 kHz to 80 MHz when the error is less than 5%. The output waveform of the integrator connected with a D-dot probe is not di