摘要:
A telescopic differential operational amplifier circuit for use in a pipelined A/D converter is provided with two auxiliary differential amplifiers connected to two cascode circuits, each including cascode-connected first to fourth transistors. During the sampling phase, first and second switches are turned on to apply a predetermined bias voltage to the gates of first and fourth transistors, and the input terminal of the differential operational amplifier circuit is set to a common mode voltage. During the hold phase, the first and second switches are turned off so that a voltage of each of the gates of the first and fourth transistors change to follow an input signal inputted via the input terminal with coupling capacitors operating as a level shifter of the input signal. Then the differential operational amplifier circuit performs push-pull operation operative only in a transconductance drive region, and is prevented from operating in a slewing region.
摘要:
A telescopic differential operational amplifier circuit for use in a pipelined A/D converter is provided with two auxiliary differential amplifiers connected to two cascode circuits, each including cascode-connected first to fourth transistors. During the sampling phase, first and second switches are turned on to apply a predetermined bias voltage to the gates of first and fourth transistors, and the input terminal of the differential operational amplifier circuit is set to a common mode voltage. During the hold phase, the first and second switches are turned off so that a voltage of each of the gates of the first and fourth transistors change to follow an input signal inputted via the input terminal with coupling capacitors operating as a level shifter of the input signal. Then the differential operational amplifier circuit performs push-pull operation operative only in a transconductance drive region, and is prevented from operating in a slewing region.
摘要:
A sample hold circuit is provided for use in a time-interleaved A/D converter apparatus including a plurality of low-speed pipeline A/D converters which are parallelized. The sample hold circuit includes a sampling capacitor and a sample hold amplifier, and operates to sample and hold an input signal by using a switched capacitor. An adder circuit of the sample hold circuit adds a ramp calibration signal to the input signal, by inputting the ramp calibration signal generated to have a frequency identical to that of a sampling clock signal and a predetermined slope based on the sampling clock signal, into a sample hold amplifier via a calibration capacitor having a capacitance smaller than that of the sampling capacitor.
摘要:
A current mirror circuit including: a first resistance element having one terminal connected to a first potential, and the other terminal connected to a second potential lower than the first potential; an operational amplifier having a high-potential input terminal connected to the first potential and the one terminal of the first resistance element; a second resistance element having one terminal connected to a low-potential input terminal of the operational amplifier, and the other terminal connected to the second potential; and a transistor having a first electrode connected to an output terminal of the operational amplifier, a second electrode connected to the low-potential input terminal of the operational amplifier and the one terminal of the second resistance element, and a third electrode used as an output terminal, wherein the first and second resistance elements both start to operate from a linear area having lower voltage than a saturation area.
摘要:
There is disclosed a current mirror circuit comprising a first transistor having a first electrode connected to a first potential, a second electrode connected to a second potential lower than the first potential, and a third electrode connected to a third potential higher than the second potential, a second transistor having a first electrode connected to the first potential and the first electrode of the first transistor, and a second electrode connected to the second potential, an operational amplifier having a high-potential input connected to the third potential and the third electrode of the first transistor, and a low-potential input connected to the third electrode of the second transistor, and a third transistor having a first electrode connected to an output of the operational amplifier, a second electrode connected to the low-potential input and the third electrode of the second transistor, and a third electrode used as an output terminal.
摘要:
A signal processing method and apparatus reducing distortion using divided signals differing in only amplitude by weighting an input signal by first weights ki (i=1 to 4) to obtain divided signals, performing the same signal processing f(x) on the divided signals, weighting the signal processed divided signals by second weights l1 (i=1 to 4), and adding the divided signals Vout1 to Vout4 weighted by the second weights. The first weights are k1=t, k2=−t, k3=1, k4=−1, while the second weights are l1=−1, l2=1, l3=t3, l4=−t3. Here, t=b/a (where a and b are different positive integers).
摘要:
A semiconductor integrated circuit device having a SOI structure which can prevent a deterioration in the breakdown voltage of a transistor without damaging integration, and a method for manufacturing the semiconductor integrated circuit device are obtained. An embedded oxide film is not formed over the whole face of a P type silicon layer but has an opening in a region which is placed below a gate electrode. The opening is filled in to form a penetration P layer. Accordingly, a SOI layer is electrically connected to the P type silicon layer through the penetration P layer. The plane position and shape of the gate electrode conform to those of the penetration P layer.
摘要:
In order to improve a withstand voltage and implement a gate array SOI semiconductor integrated circuit device having a large gate width, a region consisting of end cells (49) is provided on each end of a region formed by repeatedly arranging basic cells (BC) consisting of both transistor regions (32, 33) in a first direction and while symmetrically arranging the same to be folded in a second direction. Both ends of a channel region of a PMOS transistor (42) are drawn out in the second direction to provide a P-type semiconductor layer just under a field shielding gate electrode (FG), and this semiconductor layer is drawn also in the first direction to be connected with a P-type semiconductor layer of the end cell (49). A first source potential is applied to a region (PBD) which is bonded with one of the P-type semiconductor layers. Also as to an NMOS transistor (41) which is adjacent through a field oxide film (FO), on the other hand, an N-type semiconductor layer is similarly provided so that this N-type semiconductor layer is also connected with that of the end cell (49). A second source potential is applied to a region (NBD).
摘要:
A field programmable gate array includes a logic blocks, switching elements for establishing a signal propagation path, and memory cells provided corresponding to the switching elements for storing data determining on and off states of corresponding switching elements. In this gate array, a supply voltage fed to a power input terminal is transmitted to power supply nodes of logic circuit blocks. A booster circuit boosts the supply voltage fed to the power input terminal and feeds the boosted voltage to power supply nodes of memory cells for programming a signal propagation path. A high-level signal potential of each memory cell is fed to the gate of an n-channel MOS transistor which functions as the switching element. The switching elements are disposed on signal lines and serve to interconnect the signal lines selectively to establish a signal propagation path. The current supply capability of the MOS transistors is enhanced to realize faster propagation of the signal, and any harmful influence of the threshold voltage exerted on the signal amplitude loss can be suppressed by a rise of the gate potential in each MOS transistor.
摘要:
A neural network device includes internal data input lines, internal data output lines, coupling elements provided at the connections of the internal data input lines and the internal data output lines, word lines each for selecting one row of coupling elements. The coupling elements couple, with specific programmable coupling strengths, the associated internal data input lines to the associated internal data output lines. In a program mode, the internal data output lines serve as signal lines for transmitting the coupling strength information. Each of the coupling elements includes memories constituted of cross-coupled inverters for storing the coupling strength information, first switching transistors responsive to signal potentials on associated word lines for connecting the memories to associated internal data output lines, second switching elements responsive to signal potentials on associated internal data input lines for transmitting the storage information in the memories to the associated internal data output lines. Each of the internal data output lines has a pair of first and second internal data output lines.