Preamplifier, comparator and analog-to-digital converting apparatus including the same
First Claim
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1. 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.
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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.
23 Citations
20 Claims
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1. A preamplifier comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A comparator comprising:
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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. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An analog-to-digital converting apparatus comprising:
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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. - View Dependent Claims (20)
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Specification