3

The center frequency of the filter will be 90MHz. That pretty much rules out digi-pots because of their inherent parasitic capacitance on all pins. For instance, the A and B terminals of the AD5116 has typically 20 pF and, the wiper has typically 35 pF. At 90 MHz, a capacitance of 20 pF has an impedance (reactance) of 88 ohms and is very significant as a ...


2

Your analysis is far from being accurate. A BPF will slow down risetime ( due to -3dB BW) and cause ringing whenever Q>1. Its inverse is called Damping Factor. It seems you need a digital solution is a time delay, being a one-shot shorter than the input pulse. To realize your transfer function, let's look at what you want. +ve Pulse narrower \$~~~~~~~~~~~...


2

The passive filter response looks normal for a highish-Q bandpass. The active filter response is different because it doesn't work: the opamps don't have a negative power supply, yet the circuit would require them to output a negative voltage, so they're stuck in clipping when output voltage is near zero. In addition, the maximum input voltage spec of 4.5V ...


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