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US 2018/0122435 A1Published application
Reference selection circuit
AssigneeSK hynix Inc.
InventorYoung Joo KIM
Life of this patent
Estimating the term…
Abstract
A reference selection circuit may be provided. The reference selection circuit may include a plurality of reference drivers configured to respectively output a plurality of reference voltages having different voltage levels, and a plurality of selectors configured to select any one of the plurality of reference voltages based on a selection signal, and output the selected reference voltage to a monitoring pad.
Claims20
A reference selection circuit comprising:
- a plurality of reference drivers configured to respectively output a plurality of reference voltages having different voltage levels;
- and
- a plurality of selectors configured to select any one of the plurality of reference voltages based on a selection signal, and output the selected reference voltage to a monitoring pad,
- wherein each of the reference drivers includes:
- a comparator configured to compare a first reference voltage with a second reference voltage, and output a drive signal;
- a driver configured to pull up the second reference voltage based on the drive signal or pull down the second reference voltage based on a test mode signal;
- and
- a voltage controller configured to output different drive voltages to the driver based on the test mode signal.
5 more elements
A reference selection circuit comprising:
- a plurality of reference drivers configured to respectively output a plurality of reference voltages having different voltage levels;
- and
- a plurality of selectors configured to select any one of the plurality of reference voltages based on a selection signal, and output the selected reference voltage to a monitoring pad,
- wherein each of the reference drivers includes:
- a comparator configured to compare a first reference voltage with a second reference voltage, and output a drive signal;
- a delay portion configured to delay the drive signal by a predetermined time, and output a delay signal;
- a driver configured to pull up the second reference voltage based on the drive signal or pull down the second reference voltage based on a test mode signal;
- and
- a voltage controller configured to output a bias voltage or a voltage of the delay signal to the driver, upon receiving the test mode signal.
6 more elements
A reference selection circuit comprising:
- a plurality of reference drivers configured to respectively output a plurality of reference voltages having different voltage levels;
- and
- a plurality of selectors configured to select any one of the plurality of reference voltages based on a selection signal, and output the selected reference voltage to a monitoring pad,
- wherein each of the reference drivers includes:
- a comparator configured to compare a first reference voltage with a second reference voltage, and output a drive signal;
- and
- a driver configured to pull up the second reference voltage based on the drive signal or pull down the second reference voltage with either the drive signal or a bias voltage, depending on whether the drive signal or the bias voltage has a higher-level voltage from among the two voltages.
4 more elements
Dependencies are inferred from the claim text.