RLC circuit

About: RLC circuit is a research topic. Over the lifetime, 14490 publications have been published within this topic receiving 142697 citations.

Surface deactivateable tag

Abstract: A security tag used with an electronic security system comprises a dielectric substrate having first and second opposite principal surfaces and a resonant circuit capable of resonating at a frequency within a detection frequency range. The resonant circuit is formed, in part, by a first conductive area on the first substrate surface and a second conductive area on the second substrate surface, the two conductive areas being generally aligned with one another to establish a capacitor with the substrate therebetween forming the capacitor dielectric. A third conductive area is provided on one of the principal substrate surfaces proximate to but not electrically connected to one of the two capacitor plates. The third conductive area is electrically connected to the other capacitor plate. A portion of the third conductive area is spaced from a portion of the one capacitor plate by a predetermined minimum distance whereby upon the application of electromagnetic energy to the tag at a frequency generally corresponding to the resonant frequency of the resonant circuit and at or above a predetermined minimum energy level, an electric arc extends between the spaced portions of the third conductive area and the one capacitor plate creating a persistent conductive bridge which connects the two plates of the capacitor in a short circuit.

High frequency DC to AC inverter

Abstract: A high-frequency resonant sine wave DC to AC inverter suitable for use in a personal computer (PC) power supply includes a full-bridge inverter, a resonant circuit, a phase shift modulation circuit, and a resonant gate driver. The resonant gate driver provides sinusoidal gate drive signals to the full-bridge inverter enabling highly efficient operation on the inverter.

Switching regulated power supply apparatus including a resonant circuit

Abstract: A switching regulated power supply apparatus, comprising: an alternative current power source, a first rectifier for rectifying the alternate current output, a high frequency reference pulse generator, a pulse width modulator for modulating the pulse width of the reference pulse output as a function of a control signal, a switching transistor for on/off controlling the output from the first rectifier as a function of the pulse width modulated output, a high frequency transformer connected in series with the first rectifier and the switching transistor, a second rectifier for rectifying the output from the high frequency transformer, and a smoothing circuit for smoothing the output from the second rectifier, the output from the smoothing circuit being applied to the pulse width modulator as a control signal, characterized in that the said apparatus further comprises a resonance capacitor coupled to the said high frequency transformer for causing resonance cooperatively with the said high frequency transformer when the said switching transistor is turned off, and a switching device coupled to the output of the second rectifier to be turned on responsive to a flyback pulse obtained from the smoothing circuit when the switching transistor is turned off, whereby the said resonance is suppressed by means of the second rectifier and the switching device in the latter half cycle of the resonance during the off time period of the switching transistor.

Forming damped LRC parasitic circuits in simultaneously switched CMOS output buffers

Abstract: Measurements of a 0.5 /spl mu/m CMOS testchip using several techniques have demonstrated a reduction in the generation of ground bounce. These techniques are: an automatic transistor sizing method that compensates for process, temperature, and supply voltage variations; a self-adjusting internal capacitive load that counteracts the increased switching rate of faster parts; and an integrated resistive element inserted directly into the power and ground leads that dampens the RLC oscillations. Comparison measurements between a conventional buffer and the new buffer have demonstrated that the amplitude and duration of the generated ground bounce has been reduced 2.5/spl times/ and 2/spl times/, respectively. A single external resistor is required to set a reference current.