Patent ID: 11940828
Assignee: VANGUARD INTERNATIONAL SEMICONDUCTOR CORPORATION
Field: Control (Instruments)
Classification: CPC G | IPC G

Claim 15:
16. An electronic circuit comprising:
a high-voltage-side element having a first electrode terminal and a second electrode terminal and surrounded by an isolated deep well region; and
a voltage tracking circuit, coupled to the first electrode terminal and the second electrode terminal, tracking a first voltage at the first electrode terminal or a second voltage at the second electrode terminal to generate an output voltage at an output terminal and applying the output voltage to the isolated deep well region surrounding the high-voltage-side element,
wherein the voltage tracking circuit comprises:
a first P-type transistor having a gate, a drain, and a source, wherein the drain of the first P-type transistor is coupled to the first electrode terminal;
a second P-type transistor having a gate, a drain, and a source, wherein the gate of the second P-type transistor is coupled to the first electrode terminal, and the drain of the second P-type transistor is coupled to the second electrode terminal, and
a control circuit, coupled to the first electrode terminal and the second electrode terminal, generating a control voltage according to the first voltage and the second voltage,
wherein the source of the first P-type transistor and the source of the second P-type transistor are coupled to the output terminal of the voltage tracking circuit, and the output voltage is generated at the output terminal, and
wherein in response to the second voltage being higher than the first voltage, the control circuit generates the control signal to turn off the first P-type transistor.