摘要:
PROBLEM TO BE SOLVED: To provide an input circuit configured to convert a high potential signal to a low potential signal, the input circuit operating at an appropriate target inversion potential.SOLUTION: The input circuit comprises: an inverter; a first path control circuit; and a second path control circuit. An input of the inverter is connected to a first node. A target inversion potential is higher than an inversion potential of the inverter. The first path control circuit electrically disconnects the first node from an input terminal if an input potential is lower than the target inversion potential, and electrically connects the first node to the input terminal if the input potential is higher than the target inversion potential. The second path control circuit electrically connects the first node to a ground terminal if the input potential is lower than a second inversion potential lower than the target inversion potential, and electrically disconnects the first node from the ground terminal if the input potential is higher than the second inversion potential.
摘要:
PROBLEM TO BE SOLVED: To provide a semiconductor circuit having excellent radiation-resistant characteristics.SOLUTION: A semiconductor circuit includes a first circuit block 1 in which a plurality of pMOS transistors 11 and 12 are connected in series, and a second circuit block 2 in which a plurality of nMOS transistors 21 and 22 are connected in series. A gate of at least one pMOS transistor 12 and/or a gate of at least one nMOS transistor 21 are/is connected to an input terminal Vin, and an on-voltage is applied to a gate of at least one the other pMOS transistor 11 and/or a gate of at least one the other nMOS transistor 22.
摘要:
PROBLEM TO BE SOLVED: To provide a slew rate control device and a slew rate control method that suppress EMI noise by performing a slew rate adjustment depending on the frequency of a clock signal in an output buffer of the clock signal.SOLUTION: The slew rate control device includes: a PLL circuit 24a having a voltage-controlled oscillator 15a for converting an input VCO input voltage Vi to a clock signal CK according to a conversion gain Gi; a voltage/current converter 19a for outputting a control current Ib having a positive correlation with each of the VCO input voltage Vi and the conversion gain Gi; a buffer control circuit 21a for setting a driving current according to the control current Ib; and an output circuit 22a for outputting a clock signal CKo in response to the driving current. A relationship can thus be established in which the drivability of the output circuit 22a increases in proportion to a frequency f of the clock signal CKo to determine an appropriate slew rate in accordance with the frequency f.
摘要:
PROBLEM TO BE SOLVED: To provide a control signal generating circuit suitable for controlling a semiconductor device.SOLUTION: A Johnson counter 31 includes flip-flops FF1-FF4 and gate circuits 41-44. It changes control signals C1-C4 to an "H" level in response to start signals ST1-ST4 that are sequentially inputted, and then, the control signals C1-C4 are changed to an "L" level in response to stop signals SP1-SP4 that are sequentially inputted. Thus, without using many flip-flops, the control signals C1-C4 are sequentially changed to the "H" level and the "L" level with a desired time interval.
摘要:
PROBLEM TO BE SOLVED: To solve the problem with a dynamic logic circuit, one of logic circuits including the dynamic logic circuit and a static logic circuit as semiconductor devices including semiconductor formed using a transistor and the like, in which: the dynamic logic circuit can hold data for a certain period, so that leakage current from the transistor becomes a problem in the dynamic logic circuit as compared with the static logic circuit.SOLUTION: A logic circuit includes a first transistor with small off current and a second transistor whose gate is electrically connected. A charge is supplied to a node of the gate of the second transistor via the first transistor. To the node, the charge is supplied via first and second capacitors. The second transistor is turned on or off depending on the state of the charge. The first transistor has an oxide semiconductor in a channel formation region.
摘要:
PROBLEM TO BE SOLVED: To provide a semiconductor device with a novel structure.SOLUTION: A semiconductor device includes a first transistor with p-type conductivity, a second transistor with n-type conductivity, a third transistor, and a fourth transistor. One of a source and a drain of the third transistor is connected to a wire having a function of supplying a first potential, and the other thereof is connected to one of a source and a drain of the first transistor. One of a source and a drain of the second transistor is connected to the other one of the source and the drain of the first transistor, and the other one of the source and the drain of the second transistor is connected to one of a source and a drain of the fourth transistor. The other one of the source and the drain of the fourth transistor is connected to a wire having a function of supplying a second potential, which is lower than the first potential. For a channel formation region of each of the third transistor and the fourth transistor, an oxide semiconductor material is used.
摘要:
Disclosed herein is a delay circuit for performing one of a charge and a discharge in two stages, and delaying a signal, the delay circuit including an output section configured to output a delayed signal; two power supplies; and a delay inverter; wherein the delay inverter has a first transistor and a second transistor of an identical channel type for one of a first charge and a first discharge, the first transistor and the second transistor being connected in series with each other between the output section and one power supply, and the delay inverter has a third transistor of a different channel type from the first transistor and the second transistor for one of a second charge and a second discharge, the third transistor being connected in parallel with one of the first transistor and the second transistor.