摘要:
A method for startup and operation of an output stage of a transmitter, the output stage comprising a first protection field effect transistor (FET) and a second protection FET includes enabling a startup circuit; providing a first bias voltage to the first protection FET in the output stage and a second bias voltage to the second protection FET stage in the output stage by the startup circuit; disabling the startup circuit and enabling a protection voltage generator; providing the first bias voltage to the first protection FET in the output stage by the protection voltage generator; and providing the second bias voltage to the second protection FET in the output stage by a second bias voltage power supply.
摘要:
A method, apparatus, and system for a data synchronizer/serial link receiver that performs the alignment of the sampling clock used to retime asynchronous customer data by the application of a negative delay onto the system clock whereas the value of the applied negative delay is derived from the analysis of a temperature code obtained by a tapped delay line in conjunction with the application of preceding replica delay lines for the in-phase and quadrature clock signals.
摘要:
A continuously tunable inductor with an inductive-capacitive (LC) voltage controlled oscillator (VCO) having a primary coil. The inductor includes a separate isolated secondary coil, a set of transistors composing a closed loop with the secondary coil, a magnetic coupling between the primary coil of the LC VCO and the secondary coil, an electrical coupling between the LC VCO and the set of transistors composing a closed loop with the secondary coil, and means for electric current injection into the closed loop. Such an inductor can be tuned by modulating a mutual inductance, which is magnetically and electrically coupled with the LC VCO by injection of an electric current (I0).
摘要:
A method for dividing a plurality of multiphase signals comprising performing resetable divider stages to the plurality of multiphase signals forming a plurality of divided multiphase signals having a monotonic increasing phase with equal spacing and an ideal duty cycle of 50% through a plurality of resetable dividers, wherein the plurality of divided multiphase signals have no phase ambiguity; and producing a plurality of periodic reset signals to the plurality of resetable dividers to enable the plurality of resetable dividers to divide the plurality of multiphase signals in a timely correct sequence to form the divided multiphase signal through a reset signal generator, the plurality of periodic reset signals being produced by a combinational network of the reset signal generator, the combination network is configured for generating a number of pulses based on the plurality of multiphase signals and performing a plurality of decimation stages and wherein the periodic reset signals are generated solely in response to the plurality of multiphase signals.
摘要:
A multi-Gigahertz, low jitter phase locked loop (PLL) with adjustable gain is disclosed. In one embodiment, properties of a fVCO signal of a PLL can be acquired. Properties can include the occurrences of different types of jitter on the fVCO signal and the lock status of the PLL. A gain control module can control at least a portion of the PLL based on an analysis of the acquired properties. For example, when the loop is locked or when there is loop filter leakage, the gain of a charge pump in the PLL can be reduced. When a charge pump mismatch is detected based on the acquired properties, additional control signals can be provided to the charge pump to correct the mismatch.
摘要:
A slew rate controller for a computing system includes a slew rate control module, the slew rate control module further comprising a plurality of sampling modules, each sampling module corresponding to one of a plurality of phase signal inputs, wherein each sampling module receives an input signal, a reference voltage, and the sampling module's respective phase signal input, and wherein each sampling module generates a respective sample of a relationship between the input signal and the reference voltage during a time period indicated by the sampling module's respective phase signal input; and a finite state machine configured to output a slew rate control signal to control a slew rate of the input signal based on the plurality of samples from the sampling modules.
摘要:
An inductor including a primary coil coaxially arranged and operated in parallel with isolated secondary coils each including at least one loop winding with two open-circuited ports. At least one phase shifting device is arranged between open-circuited ports of at least one secondary coil. A method to operate an inductor by combining primary and secondary coils with phase shifting devices to get a wide tuning range is also provided. The method includes the step of phase shifting open-circuited ports of at least one secondary coil.
摘要:
A method for sending data to a memory chip includes receiving data at a data transmitter disposed on a memory hub chip, applying Tomlinson-Harashima precoding (THP) equalization to the data prior to transmitting the data; and transmitting the data from the transmitter to a memory chip.
摘要:
A system includes a memory hub chip including a Tomlinson-Harashima precoding (THP) equalizer portion operative to perform transmitter equalization at the memory hub chip and send data from to a memory chip.
摘要:
A phase rotator includes a phase selector stage operative to receive a clock signal and output a first phase and a second phase of the clock signal, a slew rate control stage including a first pass gate circuit operative to control a slew rate of the first phase of the clock signal and a second pass gate circuit operative to control a slew rate of the second phase of the clock signal, and a phase blending stage operative to combine the first phase with the second phase of the clock signal and output a phase rotated signal.