ASIC Power Supply Circuit With LDO and LC Noise Filtering
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Solution Overview
Problem
Existing power supply circuits for image forming apparatuses face challenges in maintaining voltage accuracy due to noise, particularly high-frequency noise from crosstalk within the substrate, which conventional low-pass filters cannot effectively remove.
Innovation Solution
A voltage conversion circuit comprising a DC-DC converter, an LDO, and an LC filter connected in series to reduce operation noise and high-frequency noise, where the DC-DC converter performs voltage conversion, the LDO removes ripple noise, and the LC filter addresses high-frequency noise from crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If operation voltage is reduced to meet finer semiconductor processes, then power consumption is reduced, but voltage accuracy becomes harder to maintain due to noise
Solution Approach 1:
The LDO incorporates feedback mechanisms to maintain precise output voltage despite variations in input voltage and load conditions. The feedback loop continuously monitors and adjusts the output to compensate for noise and voltage drops, ensuring voltage accuracy is maintained even at reduced operating voltages required by modern semiconductor processes.
Solution Approach 2:
The LDO serves as an intermediary voltage regulation stage that buffers the DC-DC converter's output from the sensitive electronic circuit. This intermediate regulation stage isolates the circuit from voltage fluctuations and noise, maintaining voltage accuracy while allowing the system to operate at lower voltages for reduced power consumption.
2Adaptability or versatility
If a DC-DC converter is used for voltage conversion, then voltage adaptability is improved, but operation noise is generated that must be removed
Solution Approach 1:
The LDO acts as an intermediary noise reduction stage positioned between the DC-DC converter and the electronic circuit. It specifically targets and removes ripple noise generated by the DC-DC converter's switching operations, allowing the system to maintain voltage conversion capability while eliminating the associated operation noise.
Solution Approach 2:
The LDO extracts and removes the ripple noise component from the DC-DC converter output. By separating the voltage conversion function (DC-DC converter) from the noise removal function (LDO), the system maintains voltage adaptability while actively eliminating harmful operation noise before it reaches the electronic circuit.
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 effectively reduces operation noise and high-frequency noise, ensuring the power supply meets the required voltage accuracy for electronic circuits, thereby ensuring normal operation.
Implementation Method 1
an LDO configured to step down and to remove a ripple
Implementation Method 2
a low-pass filter configured to reduce noise
Implementation Method 3
a DC-DC converter configured to perform voltage conversion for DC power supply
Data Source
AI summary
In order to eliminate inconvenience that the voltage accuracy requirement for a power supply voltage of an ASIC cannot be satisfied because noise generated inside a substrate is superimposed on the power supply voltage, an LDO and an LC filter are added between a DC-DC converter and a power supply terminal of the ASIC to reduce the noise superimposed on the power supply voltage, the LDO is added to the subsequent stage of the DC-DC converter to reduce noise generated from the DC-DC converter, and further the LC filter is added to the subsequent stage of the LDO to reduce noise generated due to crosstalk or the like.