High-Speed ​​Voltage-Level Shifter Including Automatic Bootstrapping Cascode Driver

By using an automatic bootstrap cascorder driver in a high-speed voltage level converter, the isolation and speed problems in the conversion between different voltage domains are solved, and efficient and low-noise voltage conversion is achieved.

CN111181546BActive Publication Date: 2025-03-18STMICROELECTRONICS INT NV
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Patent Information

Application Number
CN201911106176.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2018-11-13
Filing Date
2019-11-13
Publication Date
2025-03-18
Estimated Expiration
2039-11-13

AI Technical Summary

Technical Problem

The prior art has problems with isolation difficulties, large area and cost, low speeds in voltage level conversion between different voltage domains, and traditional conversions involving continuous current DC bias paths and slow signal slew rate.

Method used

Using an automatic bootstrap cascorder driver, high-speed voltage level conversion is achieved by generating intermediate voltages on the high-voltage gate and using a capacitor to convert the voltage on the low-voltage gate to the bootstrap voltage.

Benefits of technology

Reduces capacitance of low-voltage and high-voltage transistors, reduces overall charge consumption and power supply noise during switching events, improves voltage conversion speed and DC/DC conversion efficiency, and reduces delay and timing variability.

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Abstract

A method for high speed voltage level conversion, the method comprising biasing a high voltage (HV) gate of a high voltage (HV) transistor to an intermediate voltage with a biasing device. Activating a low voltage (LV) transistor with a positive voltage transition applied to the LV gate of the LV transistor, wherein the HV transistor is connected in series between an output of the LV transistor and an LV drain. In response to the positive voltage transition on the LV gate coupled to the HV gate via a capacitor therebetween, bootstrapping the intermediate voltage to a bootstrapped voltage. Discharging the output. A time constant defined by a resistance of the biasing device and a capacitance of the capacitor is greater than a minimum time constant, thereby maintaining the bootstrapped voltage on the HV gate at or above a drive voltage for a minimum period of time to discharge the output to a minimum voltage.
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