HV Driver Level Shifter Biasing Without External Capacitors
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Solution Overview
Problem
Designing high-speed circuits that are both robust and efficient is challenging due to the need for low-voltage components, which are slower than high-voltage components, and require external capacitors and additional pads for power transformation.
Innovation Solution
A high-speed circuit design incorporating a driver circuit with high-voltage components and a level shifter with low-voltage components, where a protection voltage generator converts power supply voltages to bias voltages within the low-voltage domain, eliminating the need for external capacitors and additional pads by using direct-current bias voltages to protect low-voltage components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If low-voltage components are used for high-speed operation, then speed is improved, but robustness deteriorates
Solution Approach 1:
The circuit is divided into two distinct domains: a low-voltage domain for high-speed signal processing and a high-voltage domain for robust driver operation. The level shifter acts as an interface between these segmented domains, allowing each part to operate at its optimal voltage level without compromise.
Solution Approach 2:
The level shifter serves as an intermediary component that translates signals from the low-voltage domain to the high-voltage domain. This mediator enables communication between the two voltage domains while protecting the sensitive low-voltage components from high-voltage damage.
2Stability of the object's composition
If conventional power transformation is used with external capacitors, then power supply stability is improved, but device complexity increases
Solution Approach 1:
The protection voltage generator integrates multiple functions into a single on-chip circuit: it generates both VBP and VBN bias voltages, provides protection for low-voltage components, and eliminates the need for external capacitors. This merging reduces device complexity while maintaining power supply stability.
Solution Approach 2:
The protection voltage generator is a self-contained on-chip circuit that generates its own bias voltages from the power supply, eliminating dependence on external capacitors and additional pads. The circuit serves itself by providing the necessary voltage transformation and protection internally.
3Reliability
If additional pads and external capacitors are added, then low-voltage component protection is improved, but manufacturing complexity increases
Solution Approach 1:
The protection functionality is extracted from external components (capacitors and pads) and integrated into the on-chip protection voltage generator. This extraction eliminates the need for additional manufacturing steps and external components, simplifying the overall manufacturing process.
Solution Approach 2:
The protection voltage generator performs multiple functions: it generates bias voltages for the level shifter, protects low-voltage components from high-voltage damage, and eliminates the need for external protection components. This multi-functionality reduces manufacturing complexity while maintaining comprehensive protection.
Data Source
AI summary
A high-speed circuit with a high-voltage (HV) driver circuit. The high-speed circuit has a driver circuit and a level shifter. The driver circuit includes HV components which are operated in an HV domain. The level shifter includes low-voltage (LV) components which are operated in an LV domain. The level shifter translates signals from the LV domain to the HV domain to generate control signals for the driver circuit. The high-speed circuit may include a protection voltage generator converting a power supply voltage and a power ground voltage to generate a first direct-current bias voltage (VBP) and a second direct-current bias voltage (VBN) to bias the LV components of the level shifter. The LV components of the level shifter include input transistors and protection transistors. Gate voltages of the protection transistors may be tied to VBP or VBN.