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In electrical circuit theory, the Zero Input Response or ZIR is a method of analysis which examines the behavior or response of a circuit with zero inputs. The ZIR results only from the intial state of the circuit and not from any external drive. The ZIR is also called the natural response, and the resonant frequencies of the ZIR are called the natural frequencies.
The total response of the circuit is the superposition of the ZIR and the ZSR, or Zero State Response.