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Anti-resonance peak calculation of 2 capacitors in parallel

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In this tool, I am using 2 capacitors in parallel. 1uF, 50mohm and 1uH. Capacitance, ESR and ESL respectively. The other caps values are 10uF, 50mohm and 1uH. The SRF of 1st capacitor lies around 50kHz and the second is 159kHz.

However, there is an anti-resonance peak that occurs whose frequency is around 115kHz. Whats the formula to calculate the frequency of that anti-resonance peak?
 


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