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US 2014/0368371 A1Published application
Amplifier using multi input differential pair, and comparator and analog-to-digital converting apparatus using the same
AssigneeSK hynix Inc.
InventorSi-Wook YOO
Life of this patent
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Abstract
An amplifier includes a common load suitable for outputting an output signal, a coarse input differential stage, coupled to the common load, suitable for amplifying a difference between an input signal and a coarse ramping signal to output a coarse conversion signal as a first output signal, when the coarse ramping signal is lower than the input signal, and a fine input differential stage, coupled to the common load, suitable for amplifying a difference between a fine ramping signal and a bias signal and compensating the first output signal to output a fine conversion signal as the output signal, when a zero crossing occurs by the compensated first output signal.
Claims10
An amplifier comprising:
- a common load suitable for outputting an output signal;
- a coarse input differential stage, coupled to the common load, suitable for amplifying a difference between an input signal and a coarse ramping signal to output a coarse conversion signal as a first output signal, when the coarse ramping signal is lower than the input signal;
- and
- a fine input differential stage, coupled to the common load, suitable for amplifying a difference between a fine ramping signal and a bias signal and compensating the first output signal to output a fine conversion signal as the output signal, when a zero crossing occurs by the compensated first output signal.
1 more element
The amplifier of claim wherein the fine input differential stage comprises;
- a first transistor having a gate terminal suitable for directly receiving the fine ramping signal and
- a second transistor having a gate terminal suitable for directly receiving the bias signal having the same level as a starting level of the fine ramping signal.
A comparator comprising:
- an amplifier suitable for amplifying a difference between an input signal and a coarse ramping signal to output a coarse conversion signal as a first output signal when the coarse ramping signal is lower than the input signal, amplifying a difference between a fine ramping signal and a bias signal and compensating the first output signal to output a fine conversion signal as an output signal when a zero crossing occurs by the compensated first output signal;
- a signal processing unit suitable for a coarse control signal according to the coarse conversion signal from the amplifier, and outputting a comparison signal based on the coarse conversion signal and the fine conversion signal from the amplifier;
- and
- a coarse ramping signal blocking unit suitable for blocking the coarse ramping signal according to the coarse control signal from the signal processing unit.
1 more element
The comparator of claim wherein the amplifier comprises:
- a common load suitable for outputting the output signal to the signal processing unit;
- a coarse input differential stage, coupled to the common load, suitable for amplifying a difference between the input signal and the coarse ramping signal to output the coarse conversion signal as the first output signal, when the coarse ramping signal is smaller than the input signal;
- and
- a fine input differential stage, coupled to the common load, suitable for amplifying a difference between the fine ramping signal and the bias signal and compensating the first output signal to output the fine conversion signal as the output signal, when a zero crossing occurs by the compensated first output signal.
1 more element
An analog-digital converting apparatus comprising:
- an amplifier by suitable for amplifying a difference between an input signal and a coarse ramping signal to output a coarse conversion signal as a first output signal when the coarse ramping signal is lower than the input signal, amplifying a difference between a fine ramping signal and a bias signal and compensating the first output signal to output a fine conversion signal as an output signal when a zero crossing occurs by the compensated first output signal;
- a signal processing unit suitable for generating a coarse control signal according to the coarse conversion signal from the amplifier, and outputting a comparison signal based on the coarse conversion signal and the fine conversion signal from the amplifier;
- a coarse ramping signal blocking unit suitable for blocking the coarse ramping signal according to the coarse control signal from the signal processing unit;
- and
- a code decision unit suitable for deciding a coarse digital code and a fine digital code according to the comparison signal from the signal processing unit and outputting digital pixel data.
2 more elements
The analog-digital converting apparatus of claim wherein the amplifier comprises:
- a common load suitable for outputting the output signal to the signal processing unit;
- a coarse input differential stage, coupled to the common load, suitable for amplifying a difference between the input signal and the coarse ramping signal to output the coarse conversion signal as the first output signal, when the coarse ramping signal is smaller than the input signal;
- and
- a fine input differential stage, coupled to the common load, suitable for amplifying a difference between the fine ramping signal and the bias signal and compensating the first output signal to output the fine conversion signal as the output signal, when a zero crossing occurs by the compensated first output signal.
1 more element
Dependencies are inferred from the claim text.