Band filter

143

01:54:12

Band filter

published 3 years ago

Issacsutt

3 years ago

91.88 MHz is the actual band pass frequency of your LC filter (the same as it’s resonant frequency), not 100 MHz…. Try it out by sweeping through that frequency and let me know what you think!

592azy2circuitdude

3 years ago

I agree. 91.88MHz does look like the resonate frequency. But wouldn't this actually be some kind of a resonate low pass filter? This seems to allow low frequencies through, whereas a band pass filter would block them.

592azy2circuitdude

3 years ago

Also, any thoughts or explanation of the output voltage (green waveform)? It looks like some crazy nonlinear mixing/signal multiplying is going on!

ViolationMad

3 years ago

Multiple things about the circuit. A voltmeter in simulation will always be an open circuit. This makes the capacitor on the output useless. Then, EC does not include parasitic resistance, so there will be no damping. The ideal resonance frequency is, as mentioned above, 91.888MHz. With a realistic series resistance of the source, or any component, the circuits transfer curve will resemble a low pass filter. The "modulation" is the superposition of the undamped LC tank and the "out of tune" source.

592azy2circuitdude

3 years ago

Zero source output impedance would also explain why the LC circuit oscillates without loss, and the huge amount of gain on the output. Swell.

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