US 12,334,931 B2
Signal conversion device and circuit system using the same
Yeh-Tai Hung, Zhubei (TW); Ching-Yen Chiu, Zhubei (TW); and Chung Ming Hsieh, Zhubei (TW)
Assigned to NUVOTON TECHNOLOGY CORPORATION, Hsinchu (TW)
Filed by NUVOTON TECHNOLOGY CORPORATION, Hsinchu (TW)
Filed on Nov. 30, 2023, as Appl. No. 18/524,364.
Claims priority of application No. 112127012 (TW), filed on Jul. 20, 2023.
Prior Publication US 2025/0030409 A1, Jan. 23, 2025
Int. Cl. H03K 5/01 (2006.01)
CPC H03K 5/01 (2013.01) 18 Claims
OG exemplary drawing
 
1. A signal conversion device for converting a single-ended input voltage into a differential input voltage having a positive input voltage and a negative input voltage, the signal conversion device comprising:
a first voltage selector having a first terminal, and configured to select one of the single-ended input voltage and a preset voltage as a first voltage output at the first terminal;
a second voltage selector having a second terminal, and configured to select one of the single-ended input voltage and the preset voltage as a second voltage output at the second terminal, wherein the first voltage is different from the second voltage;
a third voltage selector having a third terminal, and configured to select a system voltage or a ground voltage as a third voltage output at the third terminal;
a system voltage equalizer having a fourth terminal and a fifth terminal, and configured to selectively electrically connect the fourth terminal and the fifth terminal to the system voltage;
a first capacitor electrically connected between the first terminal and the fourth terminal;
a second capacitor electrically connected between the third terminal and the fourth terminal;
a third capacitor electrically connected between the ground voltage and the fourth terminal;
a fourth capacitor electrically connected between the second terminal and the fifth terminal;
a fifth capacitor electrically connected between the third terminal and the fifth terminal; and
a sixth capacitor electrically connected between the ground voltage and the fifth terminal,
wherein the fourth terminal is used to output the positive input voltage in a single-ended to differential conversion phase, and the fifth terminal is used to output the negative input voltage in the single-ended to differential conversion phase.