Preamplifier, comparator and analog-to-digital converting apparatus including the same
AssigneeSK hynix Inc.
InventorSi-Wook Yoo
Life of this patent
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Abstract
A preamplifier may include: a common active load suitable for providing output impedance; an output polarity changing unit suitable for changing an output polarity of output nodes; a multi-differential input stage suitable for receiving an input voltage, a coarse ramping voltage, a fine ramping voltage and a common mode voltage, and sampling the common mode voltage and the coarse ramping voltage for amplification operations; and a coupling blocking unit suitable for blocking a coupling between the output nodes and input nodes that are included in the multi-differential input stage.
Claims20
A preamplifier comprising:
- a common active load suitable for providing output impedance;
- an output polarity changing unit suitable for changing an output polarity of output nodes;
- a multi-differential input stage suitable for receiving an input voltage, a coarse ramping voltage, a fine ramping voltage and a common mode voltage for differential amplification operations;
- and
- a coupling blocking unit suitable for blocking a coupling between the output nodes and the multi-differential input stage.
A comparator comprising:
- a preamplifier suitable for blocking a coupling between output and input nodes by changing an output polarity of the output nodes, sampling a common mode voltage and a coarse ramping voltage based on a sampling control signal, generating a coarse conversion result through the output node by amplifying a difference between an input voltage and the sampled coarse ramping voltage, and generating a fine conversion result through the output nodes by amplifying a difference between a fine ramping voltage and the sampled common mode voltage;
- and
- a signal processor suitable for generating the sampling control signal based on the coarse conversion result, and generating a comparison signal based on the coarse conversion result and the fine conversion result.
An analog-to-digital converting apparatus comprising:
- a preamplifier suitable for blocking a coupling between output and input nodes by changing an output polarity of the output nodes, sampling a common mode voltage and a coarse ramping voltage based on a sampling control signal, generating a coarse conversion result through the output nodes by amplifying a difference between an input voltage and the sampled coarse ramping voltage, and generating a fine conversion result through the output nodes by amplifying a difference between a fine ramping voltage and the sampled common mode voltage;
- a signal processor suitable for generating the sampling control signal based on the coarse conversion result, and generating a comparison signal based on the coarse conversion result and the fine conversion result;
- and
- a code decision unit suitable for deciding a coarse digital code and a fine digital code based on the comparison signal to output digital data.
Dependencies are inferred from the claim text.