摘要:
An apparatus and method for a regulated voltage boost charge pump for an integrated circuit (IC) device. The charge pump generally includes a plurality of switching networks and a lift capacitor that are intermittently coupled to an output capacitor or to a regulating transistor, a differential error amplifier biasing a gate terminal of the transistor, and a controller configured to alternate states of switches in the switching networks in a pre-selected timing relationship with a clock signal of the IC device.
摘要:
An apparatus and method for a regulated voltage boost charge pump for an integrated circuit (IC) device. The charge pump generally includes a plurality of switching networks and a lift capacitor that are intermittently coupled to an output capacitor or to a regulating transistor, a differential error amplifier biasing a gate terminal of the transistor, and a controller configured to alternate states of switches in the switching networks in a pre-selected timing relationship with a clock signal of the IC device.
摘要:
Apparatus and method for counteracting high frequency attenuation of a differential input data signal as the signal is conducted through a data link. A differential input data signal is transmitted from a transmitter to a receiver through a data link. The data eye of the differential input data signal is modified at the transmitter in response to feedback from the receiver where the extent of the data eye of the differential input data signal, after being conducted through the data link, is determined. The feedback to the transmitter, dependent on the determination of the extent of the data eye, controls the data eye at the transmitter and the equalization of the differential input data signal by adapting the differential input data signal to anticipate high frequency attenuation of the differential input data signal in the data link.
摘要:
A method is provided for selecting an operating band of a voltage-controlled oscillator (“VCO”) of a phase locked loop (“PLL”) for which the lock frequency is closest to a center of the frequency range of the operating band. In such method, steps can be performed to determine the maximum and minimum frequencies of the operating band and the center frequency between them. From the center frequency of the operating band and the lock frequency within such operating band, a difference value can then be determined. The operating bands of the PLL can be tested until an operating band having the smallest difference value is determined. The VCO can then be set to such operating band in order for the lock frequency to be closest to the center frequency of the operating band.
摘要:
A method is provided for selecting an operating band of a voltage-controlled oscillator (“VCO”) of a phase locked loop (“PLL”) for which the lock frequency is closest to a center of the frequency range of the operating band. In such method, steps can be performed to determine the maximum and minimum frequencies of the operating band and the center frequency between them. From the center frequency of the operating band and the lock frequency within such operating band, a difference value can then be determined. The operating bands of the PLL can be tested until an operating band having the smallest difference value is determined. The VCO can then be set to such operating band in order for the lock frequency to be closest to the center frequency of the operating band.
摘要:
An apparatus is provided which includes a common signal node operable to conduct a first signal, a first circuit coupled to the common signal node to utilize the first signal and a signal-handling element coupled to the common signal node. The signal-handling element includes an isolating circuit coupled to the first conductor, a second conductor operable to conduct an output of the isolating circuit, and a signal-handling circuit coupled to the second conductor. The signal-handling circuit is operable to perform a signal-handling function in response to the output of the isolating circuit. By virtue of the isolating circuit, the signal-handling circuit and the first circuit are isolated from the second conductor and the signal-handling circuit. Preferably, the achieved isolation permits a communication signal included in the first signal to be conducted within a communication apparatus with less capacitance, and producing less return loss of that signal.
摘要:
A design structure for a signal-handing apparatus or communication apparatus is provided which includes a common signal node operable to conduct a first signal, a first circuit coupled to the common signal node to utilize the first signal and a signal-handling element coupled to the common signal node. A signal-handling apparatus may include an isolating circuit coupled to a first conductor, a second conductor to conduct an output of the isolating circuit, and a signal-handling circuit coupled to the second conductor. A signal-handling circuit can perform a signal-handling function in response to the output of the isolating circuit. The signal-handling circuit and the first circuit may be isolated from the second conductor and the signal-handling circuit such that a communication signal may be conducted with less capacitance and be subject to less return loss.
摘要:
A design structure for a signal-handing apparatus or communication apparatus is provided which includes a common signal node operable to conduct a first signal, a first circuit coupled to the common signal node to utilize the first signal and a signal-handling element coupled to the common signal node. A signal-handling apparatus may include an isolating circuit coupled to a first conductor, a second conductor to conduct an output of the isolating circuit, and a signal-handling circuit coupled to the second conductor. A signal-handling circuit can perform a signal-handling function in response to the output of the isolating circuit. The signal-handling circuit and the first circuit may be isolated from the second conductor and the signal-handling circuit such that a communication signal may be conducted with less capacitance and be subject to less return loss.
摘要:
A serial data receiver includes an amplitude path including a first signal conditioner that adds a first offset or subtracts a second offset based on a selection input, a preamp configured to receive a signal from a transmitter and provide an input signal to the amplitude path, an amplitude latch coupled to the amplitude path, a data latch having a data output and a decision feedback equalization (DFE) logic block coupled to the first conditioning element and the data output and configured to generate the selection output based on the data output of the data latch.
摘要:
A phase locked loop (“PLL”) includes a voltage controlled oscillator (“VCO”) operable to acquire and maintain lock at a selected output frequency of the VCO and control logic operable to perform steps in a method of selecting a frequency band for operating the VCO. Such method can include switching the VCO to a given operating band from among the plurality of operating bands of the VCO; determining a band center frequency at which the VCO oscillates in the given operating band when the control voltage is set to a center of a range of minimum to maximum control voltages [CVmin, CVmax]; determining a difference between the band center frequency and the selected output frequency when the selected output frequency is within the given operating band; switching the VCO to another operating band; repeating the above steps until a difference between the band center frequency and the selected output frequency increases; and selecting the operating band for operation of the VCO for which the difference between the band center frequency and the selected output frequency is smallest.