US 12,254,952 B2
Impedance adjusting circuit with connection detection function
Yu-Wei Chen, Taipei (TW)
Assigned to NANYA TECHNOLOGY CORPORATION, New Taipei (TW)
Filed by NANYA TECHNOLOGY CORPORATION, New Taipei (TW)
Filed on May 16, 2023, as Appl. No. 18/317,942.
Prior Publication US 2024/0386920 A1, Nov. 21, 2024
Int. Cl. G11C 7/10 (2006.01); H03K 19/00 (2006.01)
CPC G11C 7/1048 (2013.01) [H03K 19/0005 (2013.01); G11C 2207/2254 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An impedance adjusting circuit in a memory device, comprising:
a sensing node;
a pull-up impedance generator, coupled between an external voltage and the sensing node, wherein the pull-up impedance generator comprises a plurality of pull-up impedance units for providing a resistance value respectively;
a zero quotient (ZQ) calibrating circuit, coupled to the sensing node and the pull-up impedance generator; and
a controller, coupled to the sensing node and the ZQ calibrating circuit, configured to enable a detecting mode in response to a detecting command, and detect a sensing voltage on the sensing node in the detecting mode,
wherein when the sensing voltage is in a default voltage range in the detecting mode, the controller controls the ZQ calibrating circuit to perform a ZQ calibrating operation on the pull-up impedance generator, and
wherein when the sensing voltage is out of the default voltage range in the detecting mode, the controller provides a trimming command to the ZQ calibrating circuit, wherein the ZQ calibrating circuit provides a build-in trim code to the pull-up impedance generator in response to the trimming command.