摘要:
An object of the present invention is to provide a CRC circuit with more simple structure and low power consumption. The CRC circuit includes a first shift register to a p-th shift register, a first EXOR to a (p−1)th EXOR, and a switching circuit. A data signal, a select signal, and an output of a last stage of the p-th shift register are inputted to the switching circuit, and the switching circuit switches a first signal or a second signal in response to the select signal to be outputted.
摘要:
It is an object of the present invention to provide a semiconductor device that has a simple circuit structure, a small scale, and low power consumption, and can generate a desired clock signal. The semiconductor device has a clock generation circuit which generates a clock signal by dividing a modulated carrier wave, a divider circuit which generates a first divided signal by dividing a carrier wave, and a correction circuit which generates a second divided signal by further dividing the first divided signal, and has a function of performing correction for inverting the second divided signal in a period corresponding to a half period of the clock signal during modulation of the carrier wave and selecting whether the correction is performed or not.
摘要:
A memory circuit using a thin film transistor has been problems such as the drop in yield and the decrease in speed of response of the memory circuit due to variations in transistors. The purpose of the invention is to improve the yield and speed of the response of a memory cell by driving a word line by a voltage which is different from the logical amplitude of the memory cell. The invention is applicable to an SRAM, a DRAM, a mask ROM, and the like. A memory circuit of the invention is formed integrally with a display device for realizing a multi-functional display device.
摘要:
In manufacturing a semiconductor device, static electricity is generated while contact holes are formed in an interlayer insulating film by dry etching. Damage to a pixel region or a driving circuit region due to travel of the static electricity generated is prevented. Gate signal lines are spaced apart from each other above a crystalline semiconductor film. Therefore a first protective circuit is not electrically connected when contact holes are opened in an interlayer insulating film. The static electricity generated during dry etching for opening the contact holes moves from the gate signal line, damages a gate insulating film, passes the crystalline semiconductor film, and again damages the gate insulating film before it reaches the gate signal line. As the static electricity generated during the dry etching damages the first protective circuit, the energy of the static electricity is reduced until it loses the capacity of damaging a driving circuit TFT. The driving circuit TFT is thus prevented from suffering electrostatic discharge damage.
摘要:
A demodulation signal is generated by provision of a demodulation signal generation circuit to the semiconductor device capable of wireless communication and by obtainment of a difference between voltages having opposite polarities by the demodulation signal generation circuit. Alternatively, a plurality of demodulation signal generation circuits and a selective circuit which selects a demodulation signal generation circuit depending on characteristics of a received signal are provided, where operation of a second demodulation signal generation circuit stops when a first demodulation signal generation circuit is operated. The selective circuit includes an inverter circuit, a flip-flop circuit, and a selector circuit. When the second demodulation signal generation circuit has a comparator and the like, power consumption thereof is reduced.
摘要:
A level shifter that accommodates lower driving voltage of a driver circuit and has a sufficient capability of converting the amplitude of an input signal even when the voltage amplitude of the input signal is low is provided. A level shifter utilizing a current mirror circuit 150 and a differential circuit 160 is used in a portion for converting the voltage amplitude of the signal. Since the potential difference of a signal input through transistors 105 and 106 to the differential circuit 120 is amplified and outputted, the voltage amplitude can be normally converted without influence of the threshold of a transistor even when the voltage amplitude of the input signal is low.
摘要:
According to the invention, a plurality of semiconductor devices which are required to have conformance are formed from crystalline semiconductor films having uniform crystallinity on the same line, and a semiconductor circuit in which variation between semiconductor devices is small can be provided, and a semiconductor integrated circuit having high conformance can be provided. The invention is characterized in that, in a part or whole of thin film transistors which configure an analog circuit such as a current mirror circuit, a differential amplifier circuit, or an operational amplifier, in which high conformance is required for semiconductor devices included therein, channel forming regions have crystalline semiconductor films on the same line. High conformance can be expected for an analog circuit which has the crystalline semiconductor films on the same line formed using the invention as the channel forming regions of the thin film transistors. That is, the invention is characterized in that, among the thin film transistors which configures the analog circuit, the channel forming regions of the thin film transistors having at least the same polarity are formed on the same line.
摘要:
A liquid crystal display device with low power consumption is provided. In the liquid crystal display device having a source signal line driver circuit, a gate signal line driver circuit, a DAC controller, and a pixel portion and performing an image display using an n-bit (n is a natural number, n≧2) digital image signal, one pixel has memory circuits for storing an n-bit digital image signal and a D/A converter, and the n-bit digital image signal for one frame can be stored in the pixel. In case of a static image display, the image signal stored in the memory circuits is read out every frame to perform the display, and thus, only a DAC controller is driven during the display. Therefore, this contributes to a reduction of the power consumption of the entire liquid crystal display device.
摘要:
A memory having a bit line, a word line crossing the bit line, a memory cell electrically connected to the bit line and to the word line, a column decoder and a selector including a clocked inverter having a plurality of transistors electrically connected in series between a first power source and a second power source is provided. An input node of the clocked inverter is connected to the bit line, an output node of the clocked inverter is electrically connected to a data line, the plurality of transistors comprise a P-type transistor and a N-type transistor, a gate electrode of the P-type transistor and a gate electrode of the N-type transistor are electrically connected to the column decoder, and a sense amplifier is not interposed between the bit line and the input node of the clocked inverter.
摘要:
According to the invention, a plurality of semiconductor devices which are required to have conformance are formed from crystalline semiconductor films having uniform crystallinity on the same line, and a semiconductor circuit in which variation between semiconductor devices is small can be provided, and a semiconductor integrated circuit having high conformance can be provided. The invention is characterized in that, in a part or whole of thin film transistors which configure an analog circuit such as a current mirror circuit, a differential amplifier circuit, or an operational amplifier, in which high conformance is required for semiconductor devices included therein, channel forming regions have crystalline semiconductor films on the same line. High conformance can be expected for an analog circuit which has the crystalline semiconductor films on the same line formed using the invention as the channel forming regions of the thin film transistors. That is, the invention is characterized in that, among the thin film transistors which configures the analog circuit, the channel forming regions of the thin film transistors having at least the same polarity are formed on the same line.