Variable Voltage Generation Circuit Switch Resistance Mitigation
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Solution Overview
Problem
Existing variable voltage generation circuits face inaccuracies due to semiconductor process variations, voltage, and temperature, causing the internal resistance of switches to affect the generated voltage, especially when resistors are in parallel with switches.
Innovation Solution
The proposed variable voltage generation circuit employs at least two parallel switches to select the resistance of a variable resistor, thereby reducing the influence of internal switch resistance and improving voltage accuracy by allowing for precise control of the variable voltage generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If each resistor is connected in parallel with a switch for variable voltage generation, then the variable voltage can be adjusted by controlling the switches, but the internal resistance of each switch affects the voltage accuracy due to semiconductor process variation, voltage, and temperature
Solution Approach 1:
The variable resistor is divided into multiple series resistors (R1-Rn) with switches connected in parallel to each. This segmentation allows independent control of each resistor segment, enabling precise voltage adjustment while isolating the impact of switch resistance to individual segments rather than affecting the entire voltage generation chain.
Solution Approach 2:
Different parts of the voltage generation circuit have different functions: the series resistors provide the primary voltage division, while the parallel switches provide local adjustment capability. The switch resistance impact is localized to specific resistor segments, and the overall voltage accuracy is maintained by the dominant resistance values of the resistors themselves.
2Ease of operation
If switches are used in parallel with resistors to enable variable voltage output, then voltage can be adjusted, but the internal resistance of switches varies due to semiconductor process variation, voltage, and temperature, reducing voltage accuracy
Solution Approach 1:
The circuit transitions from a static resistor network to a dynamic configuration where switches can selectively connect or disconnect resistor segments. This dynamic control allows the circuit to adapt to different voltage requirements while the inherent resistor dominance ensures stability against switch parameter variations.
Solution Approach 2:
The amplifier monitors the voltage at its third input terminal and adjusts the output to maintain the desired voltage relationship. This feedback mechanism compensates for any variations in switch resistance, ensuring that the generated voltage remains accurate and stable despite changes in switch characteristics due to process, voltage, or temperature variations.
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 approach enhances the accuracy and stability of generated variable voltages by mitigating the effects of semiconductor process variations, voltage, and temperature on the circuit, resulting in more reliable voltage output.
Implementation Method 1
The amplifier has a first input terminal for receiving a first voltage, a second input terminal for receiving a reference voltage, a third input terminal, and an output terminal
Implementation Method 2
The P-type metal-oxide-semiconductor transistor has a first terminal for receiving the first voltage, a second terminal coupled to the output terminal of the amplifier, and a third terminal
Implementation Method 3
The first variable resistor includes M resistors and M switches, where an ith switch of the M switches has a first terminal coupled to the first terminal of the first variable resistor
Data Source
AI summary
A variable voltage generation circuit includes an amplifier, a P-type metal-oxide-semiconductor transistor, at least one variable resistor, and a lower resistor. Each variable resistor includes M resistors and M switches. An ith switch of the M switches has a first terminal coupled to a first terminal of the variable resistor, and a second terminal. An ith resistor has a first terminal coupled to the second terminal of the ith switch, and a second terminal coupled to a first terminal of an (i+1)th resistor, where 2≦M, 1≦i≦M, and i and M are natural numbers. Therefore, the variable voltage generation circuit outputs at least one variable voltage according to a reference voltage, the at least one variable resistor, and the lower resistor.