Transient Bias Buffer Control for Stable Pre-Driver Reference Voltages
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Solution Overview
Problem
Conventional overdrive circuitry faces issues with asymmetric conditions between high-side and low-side pre-drivers due to varying supply and reference voltages, and requires additional components for external reference voltage sourcing.
Innovation Solution
An overdrive circuitry that internally generates stable high-level and low-level reference voltages using a transient detection circuit and bias buffer, with high-side and low-side pre-drivers generating driving signals based on these voltages to stabilize output signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reference voltages are generated internally using a transient detection circuit and bias buffer, then voltage stability and signal integrity are improved, but device complexity increases
Solution Approach 1:
The transient detection circuit detects transient states before they affect the reference voltage generation, and the bias buffer pre-adjusts the voltages to maintain stability. This preliminary action prevents voltage asymmetry between high-side and low-side pre-drivers, improving reliability without requiring complex external reference voltage circuits.
Solution Approach 2:
The overdrive circuitry generates its own reference voltages internally using the transient detection circuit and bias buffer, eliminating dependence on external PMIC reference voltages. This self-service approach improves voltage stability and signal integrity while reducing external component requirements.
2Reliability
If reference voltages are sourced from an external PMIC, then voltage tolerance is accounted for, but manufacturing costs and component quantity increase
Solution Approach 1:
The reference voltage generation function is extracted from the external PMIC and implemented internally within the overdrive circuitry using the transient detection circuit and bias buffer. This eliminates the need for external reference voltage components, reducing manufacturing costs and component quantity while maintaining voltage tolerance handling capabilities.
Solution Approach 2:
The circuitry generates its own reference voltages internally, making it self-sufficient and eliminating dependence on external PMIC components. This self-service approach reduces bill of materials costs and simplifies manufacturing while maintaining the ability to handle voltage tolerance variations.
Data Source
AI summary
The present invention provides a circuitry including a transient detection circuit, a bias buffer, a high-side pre-driver, a low-side pre-driver and a post-driver. The transient detection circuit configured to detect a transient state of an input signal to generate a transient detection result. The bias buffer is configured to generate a low-level reference voltage and a high-level reference voltage according to the transient detection result. The high-side pre-driver is supplied by a supply voltage and the low-level reference voltage, and configured to generate a first driving signal according to the input signal. The low-side pre-driver is supplied by the high-level reference voltage and a ground voltage, and configured to generate a second driving signal according to the input signal. The post-driver is configured to generate an output signal according to the first driving signal and the second driving signal.