摘要:
Improved multi-sectional bobbin designs described herein define a channel suitable to accommodate a portion of the wire that transits from prior winding section to the next, wherein opposing walls of the channel so defined separate the transiting portion of the wire from both prior and next winding sections through a substantial entirety of the wires descent from an upper winding layer in the prior section to a lower winding layer in the next.
摘要:
A very high density field programmable memory is disclosed. An array is formed vertically above a substrate using several layers, each layer of which includes vertically fabricated memory cells. The cell in an N level array may be formed with N+1 masking steps plus masking steps needed for contacts. Maximum use of self alignment techniques minimizes photolithographic limitations. In one embodiment the peripheral circuits are formed in a silicon substrate and an N level array is fabricated above the substrate.
摘要:
Techniques for performing DC to DC power conversion in switch-mode converter circuits include combinations of dynamic switch shedding, phase shedding, symmetric phase circuit topologies, and asymmetric phase circuit topologies. In at least one embodiment of the invention, a method of operating a power converter circuit includes operating a first phase switch circuit portion using a first number of switch devices when the power converter circuit is configured in a first mode of operation. The first number is greater than zero. The method includes operating the first phase switch circuit portion using the first number of switch devices when the power converter circuit is configured in a second mode of operation. The method includes operating a second phase switch circuit portion using a second number of switch devices when the power converter circuit is configured in the second mode of operation. The second number is greater than the first number.
摘要:
A technique for reducing costs associated with a radio access network of a mobile telecommunications network includes configuring the radio access network using a linear programming model of the radio access network subject to constraints. The technique includes selecting cellular sites and hub locations of the radio access network to be connected by broadband wireless links based on the linear programming model and constraints. In at least one embodiment of the invention, a method of designing a radio access network of links between a cellular site and a core network includes selecting at least one first link of the radio access network to be at least one first wireless link at least partially based on a linear programming model of the radio access network. The method includes configuring an output device of a computer system to indicate the selection.
摘要:
A simple block coding arrangement is created with symbols transmitted over a plurality of transmit channels, in connection with coding that comprises only simple arithmetic operations, such as negation and conjugation. The diversity created by the transmitter utilizes space diversity and either time or frequency diversity. Space diversity is effected by redundantly transmitting over a plurality of antennas, time diversity is effected by redundantly transmitting at different times, and frequency diversity is effected by redundantly transmitting at different frequencies: Illustratively, using two transmit antennas and a single receive antenna, one of the disclosed embodiments provides the same diversity gain as the maximal-ratio receiver combining (MRRC) scheme with one transmit antenna and two receive antennas. The principles of this invention are applicable to arrangements with more than two antennas, and an illustrative embodiment is disclosed using the same space block code with two transmit and two receive antennas.
摘要:
An integrated circuit communications interface operable consistent with multiple data transmission protocols includes error detection circuitry that implements a cyclic redundancy check (i.e., CRC) function. The error detection circuitry generates a checksum based, at least in part, on a selected one of the multiple data transmission protocols. The error detection circuitry includes at least one circuit that generates a digital code according to an operation including terms common to the multiple data transmission protocols. That digital code is combined with a selected digital code to generate the CRC. The selected digital code is generated by an individual circuit corresponding to a respective one of the multiple data transmission protocols. The individual circuit generates the selected digital code according to an operation including at least terms exclusive to the respective one of the multiple data transmission protocols.
摘要:
A clock synthesis circuit includes a delta sigma modulator that receives a divide ratio and generates an integer portion and a digital quantization error (a fractional portion). A fractional-N divider divides a received signal according to a divide control value corresponding to the integer portion and generates a divided signal. A phase interpolator adjusts a phase of the divided signal according to the digital quantization error to thereby reduce noise associated with the fractional-N divider.
摘要:
A first phase-locked loop (PLL) circuit includes an input for receiving a timing reference signal from an oscillator, a controllable oscillator circuit supplying an oscillator output signal, and a multi-modulus feedback divider circuit. A second control loop circuit is selectably coupled through a select circuit to supply a digital control value (M) to the multi-modulus feedback divider circuit of the first loop circuit to thereby control the oscillator output signal. While the second control loop is coupled to supply the control value to the feedback divider circuit, the control value is determined according to a detected difference between the oscillator output signal and a reference signal coupled to the second control loop circuit at a divider circuit. While the second control loop circuit is not coupled to control the first PLL circuit, the first PLL circuit receives a digital control value to control a divide ratio of the feedback divider, the digital control value is determined at least in part according to a stored control value stored in nonvolatile storage, the stored control value corresponding to a desired frequency of the oscillator output signal.
摘要:
Semiconductor devices can be fabricated using conventional designs and process but including specialized structures to reduce or eliminate detrimental effects caused by various forms of radiation. Such semiconductor devices can include the one or more parasitic isolation devices and/or buried guard ring structures disclosed in the present application. The introduction of design and/or process steps to accommodate these novel structures is compatible with conventional CMOS fabrication processes, and can therefore be accomplished at relatively low cost and with relative simplicity.
摘要:
A technique for reducing temperature sensitivity of an LC oscillator circuit includes a passive circuit coupled in parallel with a load capacitor. In at least one embodiment, an oscillator circuit is configured to generate a periodic signal having a free-running frequency. The oscillator circuit includes a first circuit portion including at least one inductor coupled in parallel with at least one load capacitor. The first circuit portion has an inductance-capacitance product that has a first temperature sensitivity. The oscillator circuit includes a passive circuit portion coupled in parallel with the first circuit portion. The passive circuit portion includes at least one resistor in series with at least one capacitor. The passive circuit portion has a second temperature sensitivity that opposes an effect of the first temperature sensitivity on the free-running frequency of the oscillator circuit, thereby reducing temperature sensitivity of the free-running frequency.