摘要:
A semiconductor integrated circuit device which includes a logical circuit containing a MIS transistor on a semiconductor substrate, a control circuit for controlling a threshold voltage of the MIS transistor in the logical circuit, an oscillation circuit containing a MIS transistor on the semiconductor substrate, and a buffer circuit, the control circuit compares the frequency of the oscillation output and frequency of a clock signal to output a first control signal, the first control signal controls a threshold voltage of the MIS transistor of the oscillation circuit, and the buffer circuit is inputted with the first control signal to output a second control signal corresponding to the first control signal, the second control signal controlling the threshold voltage of the MIS transistor of the logical circuit.
摘要:
A low power consumption in a semiconductor integrated circuit device can be achieved by reducing a glitch power in a flip-flop. In a pulse-generator-incorporated auto-clock-gating flip-flop in which data latch is performed by using a pulsed clock, input data is latched based on an output of a dynamic XOR circuit, which is a comparator circuit, during a period when the pulsed clock is at a high level, and the dynamic XOR circuit is cut off during a period when the pulsed clock is at a low level.
摘要:
A semiconductor integrated circuit device comprising a logical circuit including a MIS transistor formed on a semiconductor substrate, a control circuit for controlling a threshold voltage of the MIS transistor forming the logical circuit, an oscillation circuit including a MIS transistor formed on the semiconductor substrate, the oscillation circuit being constructed so that the frequency of an oscillation output thereof can be made variable, and a buffer circuit, in which the control circuit is supplied with a clock signal having a predetermined frequency and the oscillation output of the oscillation circuit so that the control circuit compares the frequency of the oscillation output and the frequency of the clock signal to output a first control signal, the oscillation circuit is controlled by the first control signal so that the frequency of the oscillation output corresponds to the frequency of the clock signal, the control of the frequency of the oscillation output being performed in such a manner that the first control signal controls a threshold voltage of the MIS transistor forming the oscillation circuit, and the buffer circuit is constructed so that it is inputted with the first control signal to output a second control signal corresponding to the first control signal, the second control signal controlling the threshold voltage of the MIS transistor forming the logical circuit.
摘要:
A semiconductor device including a level converter (LSC) is disclosed. The level converter comprises a voltage-up circuit (LSC1) that operates on low voltage of power supply (VDD) and steps up voltage enough to drive the level converter and a level converter circuit (LSC2) that operates on high voltage of power supply (VDDQ). The voltage-up circuit is capable of constantly generating 2×VDD so that the level converter can convert a low voltage of power supply (VDD) below 1 V to VDDQ. This voltage-up circuit can be configured only with MOSFET transistors produced by thin oxide film deposition, thus enabling high-speed operation. To facilitate designing a circuit for preventing a leakage current from occurring in the level converter during sleep mode of a low-voltage-driven circuit (CB1), the level converter circuit (LSC2) includes a leak protection circuit (LPC) that exerts autonomous control for leak prevention, dispensing with external control signals.
摘要:
The present invention provides a sense circuit for DRAM memory cell to cover the events that a sense time becomes remarkably longer when a power source voltage is lowered, a sense time under the low voltage condition becomes shorter when temperature rises and a sense time changes to a large extent for fluctuation of processes. The present invention provides the following typical effects. A switch means is provided between the bit line BL and local bit line LBL connected to the memory cells for isolation and coupling of these bit lines The bit line BL is precharged to the voltage of VDL/2, while the local bit line LBL is precharged to the voltage of VDL. The VDL is the maximum amplitude voltage of the bit line BL. A sense amplifier SA comprises a first circuit including a differential MOS pair having the gate connected to the bit line BL and a second circuit connected to the local bit line LBL for full amplitude amplification and for holding the data. When the bit line BL and local bit line LBL are capacitance-coupled via a capacitor, it is recommended to use a latch type sense amplifier SA connected to the local bit line LBL.
摘要:
An electron beam control method has the following steps, selecting one of a plurality of pattern openings by a character beam electrode having a plurality of electrode units to allow an electron beam to pass through any pattern opening on an aperture mask on which the plurality of pattern openings are formed, determining whether or not a synchronization error of deflected operation of the electron beam performed by the plurality of electrode units is equal to or less than a tolerance, determining whether or not the electron beam is irradiated with a sample by selecting the pattern openings in sequence by the character beam electrode in a state of controlling a path of the electron beam by a blanking electrode not to irradiate the sample with the electron beam, when determined that the synchronization error is equal to or less than the tolerance, and decreasing the tolerance when determined that the electron beam is irradiated with the sample.
摘要:
In order to provide a semiconductor IC unit such as a microprocessor, etc., which satisfies both fast operation and lower power consumption properties with its high quality kept, the semiconductor IC unit of the present invention is composed so as to include a main circuit (LOG) provided with transistors, which is formed on a semiconductor substrate, and a substrate bias controlling circuit (VBC) used for controlling a voltage to be applied to the substrate, and the main circuit includes switching transistors (MN1 and MP1) used for controlling a voltage to be applied to the substrate and control signals output from the substrate bias controlling circuit is entered to the gate of each of the switching transistors and the control signal is returned to the substrate bias controlling circuit.
摘要:
A semiconductor integrated circuit device for fast and low power operations, comprising a plurality of circuit blocks of a chip, each of which has a plurality of states with different power consumption values. A power management circuit determines the state of each of the circuit blocks so as not to exceed a maximum power consumption value of the semiconductor integrated circuit device by considering the power consumption of each circuit block and by each state transition in each circuit block. The maximum power consumption value may be preset or adjustable after fabrication.
摘要:
A memory structure/circuit has at least two memory cell arrays connected to each other in a hierarchy. The bit lines of the two or more memory cell arrays are connected by hierarchy switches. The memory cells of one of the arrays can be read out faster than the others by using the hierarchy switches to select one array without selecting the other arrays. So the data that is read with higher frequency can be selectively read out faster if it is stored in the faster access memory array. If the data in the faster access memory cell array includes a copy of the data in the other array, it can be used as a cache memory. A tag array and data array in combination that are connected to another tag array and data array in combination through hierarchy switch connections can provide a cache memory that is direct mapped or set associative, and also full associative. The memory device can be used in a semiconductor data processor having a CPU in which the memory device is connected to the CPU through a bus, wherein both the CPU and the memory device are formed on a single semiconductor substrate. The memory device can also be an off-chip device.
摘要:
The oscillation circuit includes at least two ring oscillation circuits in each of which a plurality of inverters are connected in a ring shape in a multi-stage fashion, and a conductive wiring line. The output of at least one inverter of each of the ring oscillation circuits is connected to the conductive wiring line, whereby the plurality of ring oscillators are caused to oscillate at an identical frequency. A PLL is constructed in such a way that the oscillation circuit obtained by the above means is formed into a voltage-controlled oscillation circuit, and that a phase-frequency comparator, a charge pump circuit and a low-pass filter are employed.