Sequential Transistor Driving Circuit for Low-Power DRAM Signals
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Solution Overview
Problem
Dynamic Random Access Memory (DRAM) devices experience high power consumption during data reading and writing, leading to rapid battery depletion in mobile devices, which affects user experience.
Innovation Solution
A driving circuit design that includes a pull-up transistor and a pull-down transistor, controlled by a control circuit to ensure they are not switched on simultaneously, preventing direct current paths and reducing power consumption by sequencing their on/off states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the pull-up transistor and pull-down transistor are switched on simultaneously, then the switching speed is improved, but direct current paths are created causing high power consumption
Solution Approach 1:
The control circuit is designed to switch off one transistor before the other is switched on. Specifically, when transitioning from high to low state, the pull-up transistor is switched off before the pull-down transistor is switched on, and vice versa. This preliminary action prevents simultaneous conduction and eliminates direct current paths between power supply and ground, thereby reducing power consumption while maintaining acceptable switching speeds.
2Loss of time
If the pull-up transistor and pull-down transistor are switched on simultaneously, then the signal transition time is reduced, but current bursts are generated affecting signal stability
Solution Approach 1:
The control circuit implements a sequencing mechanism where one transistor is switched off before the other is switched on. This preliminary action eliminates current bursts that would otherwise occur during simultaneous conduction, thereby improving signal stability. The controlled sequential switching ensures clean signal transitions without the harmful effects of current spikes.
3Use of energy by moving object
If sequential switching of transistors is implemented, then power consumption is reduced, but the device complexity increases
Solution Approach 1:
The control circuit utilizes the output signal itself and its inverted version to automatically control the switching sequence of the transistors. When the output is high, the pull-up transistor is enabled; when the output is low, the pull-down transistor is enabled. This self-service mechanism achieves sequential switching and power consumption reduction without requiring complex external control logic, thereby minimizing the increase in device complexity.
Data Source
AI summary
A driving circuit, including: a pull-up transistor and a pull-down transistor, where a first terminal of the pull-up transistor is connected with a power source, a second terminal of the pull-up transistor is connected with a first terminal of the pull-down transistor to together output a driving signal, and a second terminal of the pull-down transistor is connected to ground; and a control circuit connected with a control terminal of the pull-up transistor and/or the pull-down transistor respectively and configured to control the on or off switching of the pull-up transistor and/or the pull-down transistor so as to change the driving signal. The pull-up transistor and the pull-down transistor are not switched on at the same time under the control of the control circuit.