15 results about "Ground bounce" patented technology

The invention relates to the technical field of electromagnetic compatibility (EMC) design of electronic circuits, in particular to a method suitable for a flow cytometer and capable of reducing interference of clock signals on EMC. The method comprises the steps that S100, clock circuit components are concentrated in a 5mm * 5mm area of the top layer of a PCB, routing is limited to a second layer through buried holes, and fundamental frequency is dynamically set; s200, laying copper in a key area for grounding, and adding a ground bounce suppression array to three layers; s300, arranging an upper ground copper layer and a lower ground copper layer by using a flexible circuit board; s400, covering the top circuit with a ferrite alloy cover, and welding and grounding; and S500, the flow velocity and the cell density are collected in real time, the clock frequency is dynamically adjusted, a frequency stabilization mechanism exists in an extreme scene, radiation is effectively reduced, and the detection precision and stability are improved. According to the method, the EMC interference of the clock signal of the flow cytometer is reduced from multiple dimensions of source inhibition, shielding protection, connection optimization and cooperative control.

The invention provides a ground bounce noise suppression circuit and a circuit board, which can be applied to the technical field of circuits. The ground bounce noise suppression circuit includes a capacitor and a diode connected in series between a first ground region and a second ground region of a circuit board, in which a forward conduction path of the diode corresponds to a direction from the first ground region to the second ground region, the reference level fluctuation tolerance of the second grounding area is greater than that of the first grounding area, and the projections of the first grounding area and the second grounding area in the thickness direction of the circuit board are not overlapped.

A data driver circuit and a display device are discussed, which are capable of reducing peak current and improving ground bouncing by optimizing a spread time of a MUX stage based on the counted bit toggle value of the image data. The display device can include a display panel in which a plurality of gate lines, a plurality of data lines, a plurality of sub-pixels, and a demultiplexer are disposed; a data driver circuit that supplies a data voltage corresponding to image data to a plurality of data channels; and a controller that controls the data driver circuit and supplies the image data to the data driver circuit. The demultiplexer includes a plurality of MUX stages and controls connection between the plurality of data channels and the plurality of data lines through switching operations of the plurality of MUX stages.

The application discloses an electromagnetic bandgap structure and a circuit board, and is applied to the field of high-frequency circuits.The electromagnetic bandgap structure comprises a center part, a signal connecting line connected with the center part and extending away from the center part, and metal wires located at the periphery of the center part, the metal wires being spaced apart from the signal connecting line, both ends of the metal wires being connected with the center part, and a shielding groove being formed between the metal wires and the center part.The electromagnetic bandgap structure provided by the application increases the noise suppression cutoff frequency depth, can effectively suppress the ground bounce effect of a power layer, and further reduces the effect of the ground bounce effect on signal quality and electromagnetic radiation; the shielding groove can avoid the diffusion of a signal interference source, so as to ensure the integrity of signal transmission.

The invention discloses a chip multi-station parallel consistency test method and device and a storage medium, and relates to the technical field of chips.The method comprises the steps that electrical parameters and heat engine parameters of a station and an adjacent station are collected and subjected to time domain alignment, and original feature vectors are generated; calculating an electric domain disturbance potential energy factor and a heat-engine coupling dispersion based on the calculation result; generating a chip collaborative damage index by using the automatic collaborative damage model; dynamically triggering an elastic phase translation mechanism according to a comparison result of the index and a risk threshold value; and generating an evaluation score in combination with a test result and updating model parameters in a closed-loop manner. The method effectively solves the problems of transient voltage drop and ground bounce noise interference of the shared power supply rail caused by random high-load action superposition of adjacent stations in the asynchronous parallel test.

The application provides a ground bounce noise suppression circuit and a circuit board, which can be applied to the technical field of circuits. The ground bounce noise suppression circuit comprises a capacitor and a diode, which are connected in series between a first grounding area and a second grounding area of a circuit board, wherein a forward conduction path of the diode corresponds to a direction from the first grounding area to the second grounding area, wherein a reference level fluctuation tolerance of the second grounding area is greater than a reference level fluctuation tolerance of the first grounding area, and projections of the first grounding area and the second grounding area along a thickness direction of the circuit board do not overlap.

Exemplary embodiments of this disclosure relate to a data driver circuit and a display device. More specifically, the display device may include: a display panel, in which multiple gate lines, multiple data lines, multiple sub-pixels, and a demultiplexer are disposed; a data driver circuit that provides data voltages corresponding to image data to multiple data channels; and a controller that controls the data driver circuit and provides image data to the data driver circuit. The demultiplexer includes multiple MUX stages, and the connection between the multiple data channels and multiple data lines is controlled by switching operations of the multiple MUX stages. The data driver circuit controls the length of at least one of a first extension time and a second extension time among multiple preset extension times of the multiple MUX stages based on bit switching counts of the image data. The data driver circuit and the display device can optimize the extension time of the MUX stages by using the counted bit switching values ​​of the image data to reduce peak current and improve ground bounce noise.

A blower control circuit, which relates to the field of electric motor control. The blower control circuit comprises a control module (11) for generating an initial control voltage, a comparison module (12) for acquiring a comparison result between a target voltage value and a zero-point potential voltage value, a calculation module (13) for generating a target control voltage, and a speed regulation module (14) for enabling a blower on the basis of the target control voltage. Since an initial control voltage output by a control module may be affected by a ground bounce voltage caused by a ground bounce phenomenon, a comparison module is provided, and a comparison result of a comparison performed by the comparison module on the potential rise of a grounding end in the control module with respect to a zero-point potential is used to adjust an instruction voltage in a calculation module, such that a target control voltage generated after adjustment is not affected by the ground bounce voltage, and the target control voltage output to a speed regulation module can meet the requirements for controlling a blower, thereby ultimately enabling the blower to generate an air volume that meets user requirements. Also disclosed are an electronic device and a vehicle.

The invention provides an air blower control circuit, electronic equipment and a vehicle, and relates to the field of motor control. As the initial control voltage output by the control module may be affected by the ground bomb voltage of the ground bomb phenomenon, according to the technical scheme of the invention, the comparison module is set, the comparison module compares the comparison result of the potential rise of the ground terminal relative to the zero point potential in the control module, and the instruction voltage is adjusted in the calculation module; therefore, the target control voltage generated after adjustment is not affected by the ground spring voltage, the target control voltage output to the speed adjusting module can meet the requirement for controlling the air blower, and finally the air volume generated by the air blower meets the requirement of a user.

The utility model belongs to the field of electronic circuits, and particularly discloses a power module grounding device and a power module, the power module comprises N paths of power supply units, the grounding device comprises N + 1 grounding terminals and a plurality of magnetic beads, and each grounding terminal is connected with different ground planes; each path of power supply unit comprises a voltage input end, a voltage input grounding end, a voltage output end and a voltage output grounding end; n voltage input grounding ends of the N paths of power supply units are connected with the first grounding terminal in the N + 1 grounding terminals; the voltage output grounding ends of the N paths of power supply units are respectively connected with the second grounding terminal to the (N + 1) th grounding terminal in the (N + 1) grounding terminals one by one; and at least one magnetic bead is connected between each grounding terminal from the second grounding terminal to the (N + 1) th grounding terminal and the first grounding terminal. According to the invention, the ground outputted by multiple paths of power supply of the power supply module is separated and reaches the board-level ground through the magnetic beads, and the number of signals on a backflow path is limited to reduce the ground bounce of the power supply module.

A gate-driving circuit for controlling a cascode power device to switch on or off while suppressing ground bounce has a gate-driving signal generator and a local power supply. The gate-driving signal generator, which receives an external control signal and accordingly generates a gate-driving signal to drive a gate of the cascode power device, is entirely powered by the local power supply. The local power supply is powered with raw electrical power received from an M point of the cascode power device such that the gate-driving circuit is self-powered without connecting to an external power supply. It avoids a need to install an isolation circuit for ground isolation between the external power supply and the cascode power device for suppressing ground bounce. Advantageously, elimination of the external power supply and isolation circuit leads to a simplified and more-compact design of the gate-driving circuit.

The present disclosure relates to a split input amplifier for protection from DC bias. Embodiments presented herein provide apparatuses and techniques to reduce direct current (DC) voltage bias between a transmitter and a receiver. Embodiments include a shared reference voltage signal generated by a reference voltage source. The receiver can include a first cell gain buffer that receives a reference voltage signal from the reference voltage source. The transmitter can be communicatively coupled to the receiver via one or more connections and can include a second cell gain buffer communicatively coupled to the first cell gain buffer via one of the connections. An amplifier (e.g., an operational amplifier) of the transmitter can include a plurality of positive inputs coupled to the second cell gain buffer and a bias tracker. The bias tracker can compensate for DC bias caused by at least power supply and / or ground bounce.

This disclosure provides a power control circuit and a chip. The power control circuit includes a node voltage generation module, a comparison module, and a control module. The node voltage generation module establishes a stable first internal node voltage based on the power port voltage and a stable second internal node voltage based on the internal circuit voltage. The comparison module compares the first internal node voltage with the power port voltage to obtain a first comparison signal, and compares the second internal node voltage with the power port voltage to obtain a second comparison signal. The control module controls the switching between the power port and the power supply terminal of the internal circuit based on the first and second comparison signals to prevent ground bounce noise from external power signals from entering the internal circuit, thereby improving chip stability. This power control circuit can prevent ground bounce noise from entering the internal circuit, thus improving chip stability, and can also reduce circuit complexity, thereby reducing chip area.

In one aspect, an apparatus comprises: a driver circuit to receive first and second ramp signals and output first and second drive signals under control of a first bias signal and a second bias signal, the first bias signal having a first edge and a second edge, the second edge having a different edge rate than the first edge, the second bias signal having a third edge and a fourth edge, the third edge having a different edge rate than the fourth edge; and an output circuit coupled to the driver circuit, the output circuit comprising at least one first active device to be driven by the first drive signal and at least one second active device to be driven by the second drive signal, where the output circuit is to amplify and output a radio frequency (RF) signal.