Calibration circuit and calibration apparatus including the same
AssigneeSK hynix Inc.
InventorsOung Sic Cho, Jong Hoon Oh
Life of this patent
Estimating the term…
Abstract
A calibration circuit sharing a resistor for impedance matching includes a command decoder configured to receive a command signal and decode the command signal into a calibration enable signal; a selector configured to select one of the calibration enable signal and a start signal according to a select signal, and provide a driving signal; and a calibration driver configured to perform an impedance matching operation in response to the driving signal, and generate a completion signal when performance is completed, wherein the start signal corresponds to a completion signal provided from another calibration circuit which shares the resistor for the impedance matching.
Claims20
A calibration circuit sharing a resistor for impedance matching, comprising:
- a command decoder configured to receive a command signal and decode the command signal into an enable signal;
- a calibration driver configured to perform an impedance matching operation in response to the enable signal, and generate a status signal indicating a status of impedance matching;
- a register configured to receive a mode signal and provide a select signal;
- and
- a selector configured to determine whether the enable signal is provided to the calibration driver according to the select signal.
A calibration apparatus comprising:
- a first calibration circuit configured to perform an impedance matching operation with a resistor for impedance matching in response to a first calibration enable signal generated by decoding a command signal, and generate a status signal indicating a status of impedance matching;
- and
- a second calibration circuit configured to share the resistor for the impedance matching with the first calibration circuit, and perform an impedance matching operation according to the status signal.
A calibration circuit, comprising:
- a selector configured to select a calibration enable signal or a start signal in response to a select signal to provide a driving signal;
- a calibration driver configured to perform an impedance matching operation according to the driving signal and generate a status signal,
- wherein the calibration driver performs the impedance matching operation by comparing a value received from a resistor for impedance matching with a reference value for generating a matching code.
Dependencies are inferred from the claim text.