Patent ID: 8442212

Claim:
A method of interfacing a first interface circuit with a second interface circuit having a tri-state buffer connected between a storage device and ground, the tri-state buffer including an input terminal to receive a first signal to be transmitted to the first interface circuit, an enable terminal, and an output terminal to transmit the first signal to the first interface circuit, the method comprising the steps of: receiving a second signal having an AC-frequency component at the output terminal of the tri-state buffer, and switching the tri-state buffer, such that (i) during a first time period, the tri-state buffer electrically transfers the second signal to a first terminal of the storage capacitor, and (ii) during a second time period different from the first time period, the tri-state buffer electrically transfers the second signal to ground rather than to the first terminal of the storage capacitor, wherein: the steps of receiving and switching are performed during a first portion of a frame including the first and second time periods; and the method further comprises inputting, during a second portion of the frame, the first signal to the input terminal of the tri-state buffer, such that the first signal is passed to the output terminal of the tri-state buffer during the second portion of the frame.