Patent
Method and circuit for producing control signal for impedance matching
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TLDR
In this paper, a method for producing a stable control signal for impedance matching is provided which is capable of suppressing variation in impedance matching data by adding a shift voltage to a voltage to be compared.Abstract:
A method for producing a stable control signal for impedance matching is provided which is capable of suppressing variation in impedance matching data by adding a shift voltage to a voltage to be compared. A comparator compares the voltage to be compared with a reference voltage and an up-down counter performs a counting operation according to a result from the comparison. A code converting circuit converts a count value output from the up-down counter to a thermometer code used for changing an impedance of an impedance varying circuit. A change in the impedance is made in a manner that, even when the voltage to be compared gets closest to the reference voltage, a shift voltage for the comparator to make an exact comparison is fed to the voltage to be compared. An averaging circuit averages a count value and the code converting circuit converts a resulting average value to the thermometer code.read more
Citations
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References
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Patent
Digitally controlled element sizing
TL;DR: In this paper, a transistor whose size is digitally controlled is used as a controlled impedance at the input of an integrated circuit to determine the effective developed impedance of the transistors, which can be used to erase manufacturing variability of the integrated circuit.
Journal ArticleDOI
Digitally adjustable resistors in CMOS for high-performance applications
T.J. Gabara,S.C. Knauer +1 more
TL;DR: In this article, a design of a CMOS series terminated line driver is discussed, and the utilization of the controlled impedance in terminating transmission lines on-chip, constant delay lines, and controlled di/dt output buffers is discussed.
Patent
Digitally controlled impedance for i/o of an integrated circuit device
TL;DR: In this article, a system for controlling the impedances of circuits on an integrated circuit chip is provided. At least one circuit is selected to operate as a p-channel transistor reference circuit, and at least one other circuit operates as an n-channel reference circuit.
Patent
Dynamic impedance compensation circuit and method
Peter L. Rosefield,Oleg Drapkin,Grigori Temkine,Gordon Caruk,Roche Thambimuthu,Kuldip Sahdra,Aris Balatsos +6 more
TL;DR: In this paper, an impedance compensation circuit and method for an input/output buffer provides dynamic impedance compensation by using programmable impedance arrays and a dynamically adjustable on-chip load, among other advantages, only a single off-chip or external calibrated impedance resistor is used and only one test pad is necessary.
Patent
Control circuit for an output driving stage of an integrated circuit
TL;DR: In this article, an impedance control circuit is proposed to control the impedance of an integrated output driving stage, which includes a variable impedance circuit having an impedance that varies with the temperature in correlation with the impedance.