Adjustable High-Level Driver Circuit Without LDO Capacitors
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Solution Overview
Problem
Conventional LDO regulators and large capacitors consume significant silicon real estate and board area, failing to meet load transient performance requirements for high-integration Power Management Integrated Chips (PMICs) like GPIO and SPMI, which necessitate efficient driver circuits that reduce area and eliminate the need for these components.
Innovation Solution
A driver circuit comprising high and low side switching elements, a regulation transistor, and a feedback circuit that adjusts the output voltage by generating a regulation voltage at the control terminal of the regulation transistor, allowing for adjustable logical high values and reducing the need for large capacitors and dedicated internal supply rails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional LDO regulators with on-chip capacitors are used, then output voltage regulation is achieved, but silicon area consumption increases significantly
Solution Approach 1:
The patent extracts and removes the large on-chip output capacitor from the LDO regulator architecture, replacing it with a capacitorless design that uses a series transistor and feedback mechanism to achieve voltage regulation without the area-consuming capacitor component
Solution Approach 2:
The patent changes the operating parameters and architecture of the voltage regulator by transitioning from a conventional LDO with capacitor to a capacitorless design using a series transistor configured as a voltage-controlled resistor, fundamentally altering how voltage regulation is achieved
2Reliability
If off-chip capacitors are used for LDO regulators, then load transient performance improves, but board area increases
Solution Approach 1:
The patent completely removes the requirement for off-chip capacitors by implementing an active feedback control mechanism using the series transistor and feedback circuit, which dynamically responds to load transients without needing external energy storage components
3Area of stationary object
If capacitorless regulator architecture is used, then area is reduced, but load transient performance deteriorates
Solution Approach 1:
The patent implements a feedback circuit that continuously monitors the output voltage and adjusts the control terminal of the series transistor in real-time, enabling the capacitorless architecture to respond dynamically to load transients and maintain stable output voltage despite the absence of energy storage capacitors
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed driver circuit effectively reduces area requirements, enhances load transient performance, and adjusts output voltage levels, enabling efficient operation of electronic circuits across different voltage domains without the need for conventional LDO regulators or large capacitors.
Implementation Method 1
a feedback circuit configured to regulate the output voltage by generating a regulation voltage at a control terminal of the regulation transistor
Data Source
AI summary
Driver circuits to invert an input signal and to generate an output signal based on the inverted input signal are presented. The voltage level of the logical high value of the output signal is adjustable. The driver circuit has a high side switching element coupled between a supply terminal and the output terminal of the driver circuit. The driver circuit has a low side switching element coupled between the output terminal of the driver circuit and a reference potential. The driver circuit has a regulation transistor, wherein a controlled section of the regulation transistor is coupled in series with the high side switching element and the low side switching element between the supply terminal and the reference potential. The driver circuit has a feedback circuit to regulate the output voltage by generating a regulation voltage at a control terminal of the regulation transistor.