IEVref: 561-01-66 ID: Language: en Status: Standard Term: parallel resonance frequency Synonym1: Synonym2: Synonym3: Symbol: fp Definition: frequency where the admittance value of a lossless resonator becomes zeroNote 1 to entry: When the electromechanical coupling factor is low, an approximate value of the frequency is given by the expression ${f}_{\text{p}}\text{ }\text{ }\text{ }\text{ }=\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\frac{1}{2\pi \text{ }\text{ }\text{ }\sqrt{{L}_{1}\frac{{C}_{1}{C}_{0}}{{C}_{1}+{C}_{0}}}}$ where C0 represents the shunt capacitance and L1 and C1 the motional inductance and the motional capacitance respectively. The expression can be derived from Figure 2 by letting R1 = 0. Figure 2 – Equivalent circuit of a piezoelectric vibrator (one-port resonator) Note 2 to entry: This entry was numbered 561-02-11 in IEC 60050-561:1991. Publication date: 2014-11 Source: Replaces: Internal notes: CO remarks: TC/SC remarks: VT remarks: Domain1: Domain2: Domain3: Domain4: Domain5: