Patent
Semiconductor device with programmable impedance control circuit
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TLDR
An output impedance control circuit of a semiconductor device is described in this paper, where a first transistor is connected to a pad, and a level controller controls a gate voltage of the first transistor in response to a voltage of a pad and a reference voltage.Abstract:
An output impedance control circuit of a semiconductor device. A first transistor is connected to a pad and a level controller controls a gate voltage of the first transistor in response to a voltage of the pad and a reference voltage. A MOS array is connected between the pad and a power supply voltage and supplies current to the pad in response to an impedance control code. A first control circuit generates the impedance control code in response to whether a voltage of the pad is converging to the reference voltage. A second control circuit controls a pull-up impedance of the output buffer circuit in response to the first impedance control code when a voltage of the pad is converging to the reference voltage.read more
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Patent
Output circuit for semiconductor device, semiconductor device having output circuit, and method of adjusting characteristics of output circuit
TL;DR: In this article, a first output buffer and a second output buffer are connected to a data pin, and a calibration circuit that is connected to the calibration pin is used to calibrate the output circuit.
Patent
Controlling for variable impedance and voltage in a memory system
TL;DR: In this article, a memory interface device, system, method, and design structure for controlling variable impedance and voltage in a memory system is described, including a calibration cell configurable to adjust an output impedance relative to an external reference resistor, and driver circuitry including multiple positive drive circuits and multiple negative drive circuits coupled to a driver output.
Patent
Method and apparatus for output driver calibration
Kang Yong Kim,Jeffrey P. Wright +1 more
TL;DR: In this article, the output drivers are calibrated by generating a first variable count in response to comparing a reference voltage to a first voltage at a calibration terminal when an external load is connected.
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Output impedance calibration circuit with multiple output driver models
TL;DR: In this article, a method and circuitry for calibration of the output impedance of output driver circuits in an integrated circuit is disclosed, where the output drivers within an area on the integrated circuit are defined as a group, and an output model indicative of the operation of output drivers and used to calibrate their output impedances is provided proximate to the output driver.
Patent
Semiconductor device with impedance control circuit
TL;DR: In this article, an output impedance control circuit, connected to a ZQ pad and an output buffer circuit, is proposed for controlling an impedance of the buffer circuit according to an external resistor connected with the pad.
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Patent
Impedance control circuit
Nam-Seog Kim,Uk-Rae Cho +1 more
TL;DR: In this article, the authors propose an impedance control circuit that reduces the impedance variance when an external impedance generated from an external resistor is matched to internal impedance by using a comparator.