Apparatus for controlling on-die termination
AssigneeHynix Semiconductor Inc.
InventorDong Uk Lee
Life of this patent
Estimating the term…
Abstract
An on-die termination control unit turns on/off a corresponding transistor according to a code signal and adjusts an on-die termination resistance so it is equal to an external resistance. An offset compensating unit detects an offset voltage from an output voltage of the on-die termination control unit, stores the detected offset voltage in a capacitor, compares the capacitor voltage canceled the offset voltage with a preset reference voltage, and outputs the comparison result. A latch stores the output of the offset compensating unit for a predetermined time. A counter counts the output of the latch and increases or decreases the code signal.
Claims29
An apparatus for controlling on-die termination, comprising:
- an on-die termination control unit configured to turn on/off a corresponding transistor according to a code signal and adjust an on-die termination resistance so it is equal to an external resistance and to produce an output voltage;
- an offset compensating unit configured to detect an offset voltage from the output voltage of the on-die termination control unit, store the detected offset voltage in a capacitor, compare the capacitor voltage with a preset reference voltage, and output a comparison result;
- a latch configured to store the comparison result for a predetermined time and to provide an output;
- and
- a counter configured to count the output of the latch and increase or decrease the code signal based on the count.
An apparatus for controlling on-die termination, comprising:
- an on-die termination control unit configured to selectively turn on/off a corresponding transistor among a first transistor group according to a first code signal and adjust an on-die termination resistance and to produce an output voltage;
- an offset compensating unit configured to detect an offset voltage from the output voltage of the on-die termination control unit, store the detected offset voltage in a capacitor, compare the capacitor voltage with a preset reference voltage, and output a comparison result;
- a latch that stores the comparison result for a predetermined time to provide an output;
- a counter configured to count the output of the latch, increase or decrease the first code signal, and output a second code signal based thereon;
- and
- a driving control unit configured to selectively turn on/off a corresponding transistor among a second transistor group according to the second code signal to adjust an output resistance.
An apparatus for controlling on-die termination, comprising:
- an on-die termination control unit having an output node and configured to turn on/off a corresponding transistor according to a code signal and adjust an on-die termination resistance so it is equal to an external resistance;
- an external resistor coupled to the on-die termination control unit;
- an offset voltage canceling unit coupled to the output node of the on-die termination control unit;
- a comparator having one input terminal supplied with a reference voltage and another input terminal coupled to the offset voltage canceling unit, and configured to compare voltage input to the respective input terminals to produce an output signal;
- and
- a counter configured to increase or decrease the code signal using the output signal of the comparator.
Dependencies are inferred from the claim text.