Internal Voltage Generating Circuit with Segmented Resistors
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Solution Overview
Problem
Existing internal voltage generating circuits face a tradeoff between current consumption and voltage setting time, where high resistance reduces current consumption but increases voltage setting time, and low resistance reduces voltage setting time but increases current consumption, failing to meet the need for generating reference voltages in multiple preset ranges with fast voltage setting and low power consumption.
Innovation Solution
The internal voltage generating circuit employs first and second pull up and pull down resistors activated by range signals, connected in series with a resistor string, and a voltage selection circuit to select voltages from multiple nodes, allowing for rapid voltage setting with minimal current consumption by activating both range signals initially and deactivating them in idle mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the resistances of resistors in the resistor string are increased to reduce current consumption, then current consumption is reduced, but the voltage setting time is significantly increased
Solution Approach 1:
The pull-up and pull-down resistor networks are segmented into multiple independent resistor units (first pull-up resistor, second pull-up resistor, first pull-down resistor, second pull-down resistor) that can be selectively activated. This segmentation allows the circuit to use low resistance (fast charging) only when needed during voltage transitions, and high resistance (low power) during idle operation, thereby resolving the contradiction between current consumption and voltage setting time.
Solution Approach 2:
The resistor networks are made dynamic through the use of control signals that selectively activate or deactivate specific resistor units based on the operational state. During voltage transitions, the circuit dynamically switches to a low-resistance state for fast voltage setting, and during idle periods, it dynamically switches to a high-resistance state for low current consumption, thus resolving the static contradiction between speed and power consumption.
2Loss of time
If the resistances of resistors are decreased to reduce voltage setting time, then voltage setting time is reduced, but current consumption is increased
Solution Approach 1:
The resistor networks are divided into multiple segments that can be independently controlled. During voltage transitions, only the necessary low-resistance segments are activated to minimize voltage setting time, while other segments remain inactive to avoid unnecessary current consumption, thus resolving the contradiction between speed and power.
Solution Approach 2:
The effective resistance of the pull-up and pull-down networks is dynamically changed based on operational requirements. The circuit switches between different resistance states (high resistance for idle, low resistance for active operation) by selectively activating different resistor units, thereby optimizing the tradeoff between voltage setting time and current consumption.
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
This configuration enables the generation of reference voltages in various ranges with reduced voltage setting time and low current consumption, effectively addressing the tradeoff between these two factors.
Implementation Method 1
A common scheme for generating the internal voltages is voltage division. the resistor string 110 including a plurality of series resistors connected between a power supply voltage terminal VDD and a ground voltage terminal VSS
Data Source
AI summary
An internal voltage generating circuit may include a first pull up resistor activated by a first range signal and connected between a pull up voltage terminal and a pull up common node; a second pull up resistor activated by a second range signal and connected between the pull up voltage terminal and the pull up common node; a first pull down resistor activated by the first range signal and connected between a pull down voltage terminal and a pull down common node; a second pull down resistor activated by the second range signal and connected between the pull down voltage terminal and the pull down common node; a resistor string including a plurality of series resistors connected between the pull up common node and the pull down common node; and a voltage selection circuit select voltage in response to voltage selection information.