Cascode Transistor Biasing for Standby Leakage Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Transistors in electronic devices experience leakage currents, such as gate-induced drain leakage (GIDL) and subthreshold leakage (ISUB), leading to increased power consumption and reduced performance, especially when in standby mode.
Innovation Solution
Implementing a cascode arrangement with transistors having a high voltage threshold (Vth) and dynamically biasing the gate of the drain-side transistor with a control signal, which reduces the voltage differential between the drain and gate/source, thereby minimizing leakage current during standby mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If transistors are used in standby mode, then device functionality is maintained, but leakage current increases power consumption
Solution Approach 1:
The patent applies dynamics by making the transistor threshold voltage adjustable rather than fixed. A control signal dynamically adjusts the threshold voltage of the transistor in the cascode arrangement during standby mode, optimizing the balance between leakage current reduction and off-state accuracy. This dynamic adjustment allows the system to adapt to different operating conditions and minimize power consumption while maintaining reliable transistor switching behavior.
2Loss of energy
If cascode arrangement with high Vth transistors is used, then leakage current is reduced, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the threshold voltage parameter of the transistors in the cascode arrangement. By using high Vth transistors and dynamically adjusting their threshold voltage through control signals, the patent reduces leakage current while managing the complexity through systematic parameter optimization rather than complex circuit topologies.
3Loss of energy
If dynamic control signal is applied to gate, then leakage current is minimized, but control circuit complexity increases
Solution Approach 1:
The patent applies the intermediary principle by introducing a control signal as a mediator between the power supply and the transistor gates. This control signal acts as an intermediate element that dynamically adjusts the transistor threshold voltages to minimize leakage current without requiring complex control circuitry. The control signal serves as a simple yet effective intermediary that coordinates the operation of the cascode transistors during standby mode.
Data Source
AI summary
Methods, systems, and devices for leakage current reduction in electronic devices are described. Electronic devices may be susceptible to leakage currents when operating in a first mode, such as an inactive (e.g., a standby) mode. To mitigate leakage current, an electronic device may include transistors coupled in cascode configuration where a gate of a drain-side transistor in the cascode configuration is configured to be biased by an adjustable (e.g., a dynamic) control signal. When the transistors are inactive (e.g., “off”), the control signal may be adjusted to prevent leakage associated with the inactive transistors. Further, a source-side transistor in the cascode configuration may be configured to have a high threshold voltage (e.g., relative to the drain-side transistor).