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US 2013/0076399 A1Published application
Comparison circuit and impedance calibration circuit using the same
AssigneeHynix Semiconductor Inc.
InventorHyun Sik JEONG
Life of this patent
Estimating the term…
Abstract
A comparison circuit includes: an offset removal unit configured to store offset information of a comparator in response to a reference voltage, and compare a pad voltage with the reference voltage based on the offset information to drive a first node; and a comparison signal output unit configured to buffer a signal of the first node and output a comparison signal.
Claims23
A comparison circuit comprising:
- an offset removal unit configured to store offset information of a comparator in response to a reference voltage, and compare a pad voltage with the reference voltage based on the offset information to drive a first node;
- and
- a comparison signal output unit configured to buffer a signal of the first node and output a comparison signal.
An impedance calibration circuit comprising:
- a comparison circuit configured to receive first to third period signals and generate a comparison signal by comparing a reference voltage and a pad voltage;
- and
- a counter configured to count a code for calibrating a resistance value of an on-die termination (ODT) circuit in response to the comparison signal, and generate the first to third period signals.
The impedance calibration circuit of claim of 9, wherein the counter comprises:
- a shifting unit configured to generate a first detection signal by buffering the comparison signal, and generate a second detection signal by shifting the comparison signal in synchronization with a clock signal;
- a clock generation unit configured to buffer the clock signal and generate the buffered signal as a toggling clock signal in response to the first and second detection signals;
- a code generation unit configured to generate a toggling code in response to the first detection signal and the code;
- a code control unit configured to control the code in response to the toggling code;
- and
- a period signal generation unit configured to generate the first to third period signals in response to the toggling code.
3 more elements
Dependencies are inferred from the claim text.