摘要:
An AD converter that operates at high speed and precision of which is disclosed. The AD converter includes an analog-to-digital (AD) conversion part that samples an analog signal according to a sampling clock and converts it into a digital signal, a jitter measuring circuit that measures the jitter of the sampling clock, and a correction circuit that corrects a digital signal output from the AD conversion part. The AD converter further comprises a clock source and a sampling generating circuit that generates a sampling clock by dividing the clock generated by the clock source, wherein the jitter measuring circuit measures the jitter of the sampling clock with respect to the click on the basis of a clock CK.
摘要:
A TDC circuit having a small scale circuit and high resolution is disclosed, which is a time-to-digital converter that detects a phase with respect to a reference clock of a signal to be measured, comprising a first delay line in which a plurality of first delay elements with a first delay amount is connected in series, a second delay line group that is connected to a plurality of connection nodes of the first delay line or an input node in the first stage and in which at least one or more second delay elements with a second delay amount different from the first delay amount are connected in series, a plurality of judgment circuits that judge whether the changing edge of the signal to be measured is advanced or delayed with respect to the changing edges of a delayed clock output from the first delay element and the second delay element, and an operation circuit that calculates a phase with respect to the reference clock of the changing edge of the signal to be measured from the judgment results, wherein a difference between the first delay amount and the second delay amount is smaller than the first delay amount and the second delay amount.
摘要:
An AD converter that operates at high speed and precision of which is disclosed. The AD converter includes an analog-to-digital (AD) conversion part that samples an analog signal according to a sampling clock and converts it into a digital signal, a jitter measuring circuit that measures the jitter of the sampling clock, and a correction circuit that corrects a digital signal output from the AD conversion part. The AD converter further comprises a clock source and a sampling generating circuit that generates a sampling clock by dividing the clock generated by the clock source, wherein the jitter measuring circuit measures the jitter of the sampling clock with respect to the click on the basis of a clock CK.
摘要:
A continuous-time band-pass ΔΣ AD modulator subtracts an analog signal from a DA converter from an inputted analog signal, outputs an analog signal having a subtraction result to an AD converter via a continuous-time analog band-pass filter, outputs a digital signal from the AD converter to the DA converter, and outputs the same digital signal as a digital signal subjected to a band-pass ΔΣ AD modulation processing. The highest input frequency “fin” of the inputted analog signal is substantially set to three-fourths of a sampling frequency “fs”. The DA converter is configured to convert the inputted digital signal into the analog signal, and outputs the analog signal, which is inverted or not in response to a value of the inputted digital signal and has an amplitude of substantially zero and a gradient of substantially zero at a timing k/(2fs).
摘要:
A portable information system having an information registration function achieves reduction in manufacturing cost and power consumption. By connecting portable information equipment (1) and a battery charger (10) to be chargeable, signal transmission becomes possible between a micro controller (2) in the portable information equipment (1) and a micro controller (11) in the battery charger (10). Under the control of the micro controllers (2, 11), information management operation is automatically performed during charging. The operation includes backup processing in which personal information stored in a storage portion (3) in the portable information equipment (1) is transferred to a storage portion (12) in the battery charger (10) as backup information, and restore processing in which the backup information stored in the storage portion (12) is transferred to the storage portion (3) as the personal information.
摘要:
A semiconductor integrated circuit including a first MOS transistor supplied with a first power supply voltage and having a high threshold voltage; a second MOS transistor supplied with a second power supply voltage and having the high threshold voltage; a logic circuit connected between the first transistor and the second transistor and including a plurality of MOS transistors having a low threshold voltage; a control circuit for generating a control signal when the logic circuit is in a standby state; and a voltage generating circuit for generating a first voltage which is a higher than the first power supply voltage and a second voltage which is a lower than the second power supply voltage, for supplying the first voltage to a gate of the first MOS transistor and for supplying the second voltage to a gate of the second MOS transistor when the logic circuit is in the standby state, thereby to decrease leakage current through the first and second transistors and through the logic circuit when in the standby state.
摘要:
A semiconductor neural network includes a coupling matrix having coupling elements arranged in a matrix which couple with specific coupling strengths internal data input lines to internal data output lines. The internal data output lines are divided into groups. The neural network further comprises weighting addition circuits provided corresponding to the groups of the internal data output lines. A weighting addition circuit includes weighing elements for adding weights to signals on the internal data output lines in the corresponding group and outputting the weighted signals, and an addition circuit for outputting a total sum of the outputs of those weighting elements. The internal data output lines are arranged to form pairs and the addition circuit has a first input terminal for receiving one weighting element output of each of the pairs in common, a second input terminal for receiving the other weighting element output of each of the pairs in common, and a sense amplifier for differentially amplifying signals at the first and second input terminals. The neural network further includes a circuit for detecting a change time of an input signal, a circuit responsive to an input signal change for equalizing the first and second input terminals for a predetermined period, and a circuit for activating the sense amplifier after the equalization is completed. The information retention capability of each coupling element is set according to the weight of an associated weighting element. This neural network can provide multi-valued expression of coupling strength with less number of coupling elements.
摘要:
A semiconductor memory device operable for reading and writing in a normal mode and in a test mode is divided into memory cell sections each having blocks of memory cells. Data bus lines are connected to the respective blocks, and switches interconnect data bus lines connected to blocks of the different sections. The switch are made conductive during reading and writing in the normal mode and during writing in the test mode, and nonconductive during reading in the test mode. Input data are applied onto the data bus lines connected one of the blocks for writing in the blocks of the sections simultaneously during writing in the normal mode and in the test mode. In the normal mode, data are read out of the blocks of the sections through the data bus lines connected to the above-mentioned one of the blocks. In the test mode, the data are read out of the blocks of the sections through the data bus lines connected to the respective blocks.
摘要:
A semiconductor memory device having a folded bit line structure (16a, 16b), in which a field oxide film (2) is formed on both sides of a channel region (11) of a transfer gate, a groove isolation region 12 for defining a memory cell region is formed to surround the field oxide film 2, and the side walls of the groove isolation region 12 include a memory cell utilized as a capacitor for storing charges as information.
摘要:
A semiconductor neural network includes a plurality of data input line pairs to which complementary input data pairs are transmitted respectively, data output line pairs respectively deriving complementary output data pairs and a plurality of coupling elements arranged at respective crosspoints of the data input lines and the data output lines. The coupling elements are programmable in states, and couple corresponding data output lines and corresponding data input lines in accordance with the programmed states thereof. Differential amplifiers formed by cross-coupled inverting amplifiers are provided in order to detect potentials on the data output lines. The differential amplifiers are provided for respective ones of the data output line pairs.