Impedance correction circuit
A technology of impedance correction and correction circuit, which is applied in the direction of logic circuit coupling device, logic circuit connection/interface arrangement, static memory, etc., and can solve problems such as impedance value error, insufficient precision, and internal impedance that does not meet the specifications.
Pending Publication Date: 2021-12-17
WINBOND ELECTRONICS CORP
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Problems solved by technology
[0002] In the traditional technology, when the impedance correction (such as ZQ correction) of the memory is performed, the memory can only be corrected in a limited period, so as to correct the internal impedance value of the memory to a value close to the preset impedance, but in the limited period of correction, The result of the calibration is usually not accurate enough and the impedance value has a considerable error, resulting in the situation that the internal impedance in the memory device is out of specification
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[0016] Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used in the drawings and description to refer to the same or like parts.
[0017] Figure 1A It is a schematic diagram of an impedance correction circuit 1 according to an embodiment of the present invention. The impedance correction circuit 1 includes a correction circuit 10 , a correction circuit 11 , a switch circuit 12 , and a control circuit 13 . The calibration circuit 10 is coupled to the external resistor Rext through the pad PD, and can receive the control signal Vc1 to adjust the impedance of the calibration circuit 10 , so it can be biased with the external resistor Rext to generate the voltage V1. The voltage V1 is transmitted to the control circuit 13 through the switch circuit 12 , and the control circuit 13 adjusts the control signal Vc1 transmitte...
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The invention provides an impedance correction circuit, and the circuit comprises a first correction circuit, a second correction circuit, a switching circuit and a control circuit. The first correction circuit is suitable for being coupled with an external resistor through a connecting pad and generating a first voltage. The second correction circuit generates a second voltage and a third voltage. The switching circuit is coupled to the first and second correction circuits. The switching circuit selectively provides the first, second and third voltages to the first and second nodes. The control circuit is coupled to the first and second nodes and generates first, second and third control signals according to the voltages of the first and second nodes. In a first time interval, the switching circuit provides a first voltage to the first and second nodes. In a second time interval, the switching circuit provides the second voltage to the first and second nodes, or provides the second and third voltages to the first and second nodes, respectively.
Description
technical field [0001] The invention relates to a circuit, in particular to an impedance correction circuit. Background technique [0002] In the traditional technology, when the impedance correction (such as ZQ correction) of the memory is performed, the memory can only be corrected in a limited period, so as to correct the internal impedance value of the memory to a value close to the preset impedance, but in the limited period of correction, The calibration result is usually not accurate enough and the impedance value has a considerable error, resulting in the situation that the internal impedance in the memory device is out of specification. Contents of the invention [0003] The present invention is directed to an impedance correction circuit, which performs impedance correction for a memory device. [0004] According to an embodiment of the present invention, the impedance correction circuit includes a first correction circuit, a second correction circuit, a switch ...
Claims
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IPC IPC(8): H03K19/0175G11C5/14
CPCH03K19/017545G11C5/147
Inventor 道冈义久
Owner WINBOND ELECTRONICS CORP