RLC circuit

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

Analytical models and algorithms for the efficient signal integrity verification of inductance-effect-prominent multicoupled VLSI circuit interconnects

Abstract: Novel signal integrity verification models and algorithms for inductance-effect- prominent RLC interconnect lines are developed by using a traveling-wave-based waveform approximation (TWA) technique. The multicoupled line responses are decoupled into the eigenmodes of the system in order to exploit the TWA technique. Then, the response signals are mathematically represented by the linear combination of each eigenmode response based on TWA, followed by reporting the signal integrity models and algorithms for the multicoupled lines. The signal integrity of VLSI circuit interconnects is complicatedly correlated with input signal switching-patterns, layout geometry, and termination conditions. It is shown that the technique can be efficiently employed for complicated multicoupled interconnect lines with various termination conditions and the signal transients based on the technique have excellent agreement with SPICE simulations. Thus, with the proposed technique, the switching-dependent signal delay, crosstalk, ringing, and glitches of the inductance-effect-prominent RLC interconnect lines can be accurately as well as efficiently determined.

LLC resonant converter control method, synchronous rectification control method and device

Abstract: The invention discloses an LLC resonant converter control method, synchronous rectification control method and device, wherein the LLC resonant converter control method comprises the steps of: judging whether a load works in a preset state or not according to the connection frequency of an input switching tube of an LLC resonant circuit; if the load works in the preset state, enabling the LLC resonant circuit to work in a width modulation mode, and otherwise, enabling the LLC resonant circuit to work in a frequency modulation mode, wherein the preset state comprises a light load state or no-load state. The invention realizes the voltage stabilization under the condition of light load or no-load of the LLC resonant circuit, lowers the circuit loss, effectively simplifies a peripheral hardware circuit, and is more reliable in use compared with the prior art.

Rf coil and magnetic resonance imaging device

Abstract: To provide a technique for sufficiently eliminating magnetic coupling between RF coils and improving image quality when a multi-element multi-tuned RF coil is used as a receive RF coil for an MRI device. In the invention, each of RF coils which constitute a multi-element multi-tuned RF coil which is used as a receive RF coil for an MRI device is provided with an inter-coil magnetic coupling prevention circuit which resonates at each frequency to which each RF coil is tuned and provides a high impedance. The inter-coil magnetic coupling prevention circuit adjusts an inductor and a capacitor so that both of a circuit on the side of a pre-amplifier viewed from both ends of a signal reception circuit and a circuit on the side of the signal reception circuit viewed from both ends of a serial resonance circuit connected to the pre-amplifier resonate at a plurality of frequencies to which the respective RF coils are tuned.

Modeling the dc superconducting quantum interference device coupled to the multiturn input coil

Abstract: In order to study the effect of a multiturn input coil on superconducting quantum interference device (SQUID) characteristics, the radio frequency (rf) properties of the coupling circuit between the SQUID coil and the input coil are studied. For the measurement of rf properties of the coupling circuit, the so‐called expanded model of the coupling circuit using normal metals was adopted, which is shown to be very useful for this purpose. It is shown that the SQUID coil cannot be expressed by a simple inductance when the SQUID coil is coupled to the input coil, i.e., many resonant structures are observed in rf properties of the coupling circuit. It is also shown that the damping resistance is useful in suppressing the resonant structures. Using the experimental results, a circuit model of the SQUID coupled to the multiturn input coil is proposed.

LC ladder-based synthesis of log-domain bandpass filters

Abstract: The design method of log-domain filters based on LC ladder synthesis is extended to cover a class of filter topologies which were not realizable otherwise. As an example, bandpass filters are considered. Known log-domain sub-circuits are combined together to realize a more versatile multiple-input log-domain integrator circuit. The realization of a second-order bandpass filter is discussed. A large signal analysis of the circuit shows how the gain, cutoff frequency, and Q-factor can be electronically and independently tuned. Experimental results are presented.