摘要:
Provided is a load fluctuation compensation circuit for compensating a power source voltage supplied to an operation circuit, the load fluctuation compensation circuit including: a periodic signal changing section that receives a power source voltage from a power source shared with the operation circuit, and outputs a changed signal resulting from changing a supplied periodic signal according to the power source voltage; a phase comparator that compares a phase of the periodic signal with a phase of the changed signal outputted from the periodic signal changing section; an initializing section that generates a bias voltage supplied to the periodic signal changing section and adjusts a phase difference between the periodic signal and the changed signal to a preset value, based on the comparison result of the phase comparator; a controller that holds the bias voltage outputted from the initializing section when the phase difference between the periodic signal and the changed signal has become the preset value; a power current consumption circuit that shares a power source with the operation circuit; and a fluctuation compensation section that controls an amount of a power current supplied to the power current consumption circuit, based on the comparison result outputted from the phase comparator while the bias voltage of the initializing section is kept on hold.
摘要:
Provided is a switching apparatus connecting a transmission line designated among transmission lines, between input and output terminals, and preventing a signal at the terminal from leaking to a control wiring, becoming a noise, and being superposed onto a signal at the other end. The switching apparatus includes: a plurality of input series switches switching the connection state between one end of the transmission lines and the input terminal according to a control signal; a plurality of output series switches switching the connection state between the other end of the transmission lines and the output terminal according to a control signal; a plurality of control wirings that supply a control signal to the input series switch and the output series switch; and a noise removal section that is provided between the input series switch and the output series switch and that reduces a noise propagated via a control wiring.
摘要:
A system-on-chip or other circuit has an on-chip noise-free ground which is added to divert ground noise from the sensitive nodes. An on-chip decoupling capacitor, tuned in resonance with the parasitic inductance of the interconnects, can be provided to add an additional low impedance ground path.
摘要:
A system includes first and second synchronous circuits and an asynchronous circuit configured to receive input from the first synchronous circuit and to send output to the second synchronous circuit. First and second variable clock generators are configured to drive the first and second synchronous circuit. A delay circuit is configured in a pathway from the first variable clock generator to the second variable clock generator, the delay circuit being configured to add a delay to the pathway based upon a processing time or an expected processing time of the asynchronous circuit. The delay circuit is further configured to induce additional uneven delay into the pathway. The additional uneven delay disperses local current absorption, thereby decreasing overall electro magnetic emissions of the system.
摘要:
A speed performance measurement circuit that may perform speed performance measurement is provided between a first logic circuit and a second logic circuit. The speed performance measurement circuit includes a first flip flop that stores first data, a first delay circuit that delays the first data and generates second data, and a second flip flop that stores the second data. Furthermore, the speed performance measurement circuit includes a first comparator circuit that compares output of the first flip flop to output of the second flip flop, and a third flip flop that stores output data from the first comparator circuit in accordance with timing of the first clock signal. Data in a normal path is compared to data in a path delayed by a certain time to measure speed, and power voltage of a circuit is determined based on such comparison. Thus, change in speed with respect to power voltage in a critical path can be measured.
摘要:
Semiconductor devices, a system including said semiconductor devices and methods thereof are provided. An example semiconductor device may receive data scheduled for transmission, scramble an order of bits within the received data, the scrambled order arranged in accordance with a given pseudo-random sequence. The received data may be balanced such that a difference between a first number of the bits within the received data equal to a first logic level and a second number of bits within the received data equal to a second logic level is below a threshold. The balanced and scrambled received data may then be transmitted. The example semiconductor device may perform the scrambling and balancing operations in any order. Likewise, on a receiving end, another semiconductor device may decode the original data by unscrambling and unbalancing the transmitted data. The unscrambling and unbalancing operations may be performed in an order based upon the order in which the transmitted data is scrambled and balanced.
摘要:
An apparatus for shifting a received signal at a first reference level to an output signal at a second reference level; the received signal including information-indicating signal values; includes: (a) an input locus for receiving the received signal; (b) an output locus for presenting the output signal; (c) a first signal-handling circuit coupled with the input locus and with the output locus and setting the second reference level at the output locus; and (d) a second signal-handling circuit coupled with the input locus and with the first signal-handling circuit; the first signal-handling circuit and the second signal-handling circuit cooperating to convey the information-indicating signal values from the input locus to the output locus.
摘要:
Methods and circuitry for reducing ground bounce and VCC sag effects in integrated circuit (“IC”) devices is provided. In particular, a via-programmable design for I/O circuitry in IC devices is provided. The via-programmable I/O circuitry is used to disconnect I/O pin driver circuitry from and create a substantially direct connection between unused I/O pins and the ground and/or VCC signals of an IC device to reduce ground bounce and VCC sag, respectively.
摘要:
Integrated circuit devices include data inversion circuits therein that are configured to evaluate at least first and second ordered groups of input data in parallel with an ordered group of output data previously generated by the data inversion circuit. The data inversion circuit is further configured to generate inverted versions of the first and second ordered groups of input data as versions of the first and second ordered groups of data in parallel at outputs thereof whenever a number of bit differences between the first ordered group of input data and the ordered group of output data is greater than one-half a size of the first ordered group of input data and a number of bit differences between the second ordered group of input data and the version of the first ordered group of input data is greater than one-half a size of the second ordered group of input data, respectively.