Imaging Apparatus Current Consumption Circuit Voltage Fluctuation
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Solution Overview
Problem
Conventional imaging apparatuses experience voltage fluctuations on the current supply line due to changes in current consumption, leading to increased noise in signal outputs, especially when multiple chips shift from a low to a high current consumption state, broadening the fluctuation range and deteriorating signal accuracy.
Innovation Solution
The implementation of a current consumption circuit that operates with a higher current consumption during the blanking period to match the current consumption during the output period, reducing the difference in current consumption between states and minimizing voltage fluctuations on the supply line, thereby reducing noise in signal outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the output circuit switches between first and second states, then the output circuit can perform different operations, but the current consumption amount fluctuates causing voltage fluctuations and noise
Solution Approach 1:
The current consumption circuit performs preliminary action by consuming current during the blanking period when the output circuit is in the first state. This pre-consumed current compensates for the current consumption increase when the output circuit switches to the second state, thereby preventing voltage fluctuations and noise that would otherwise occur during state transitions.
2Productivity
If multiple chips simultaneously shift from low to high current consumption state, then the chips can perform operations requiring higher current, but the current supply line experiences broadened voltage fluctuations
Solution Approach 1:
Multiple chips perform preliminary action by consuming current during their respective blanking periods before needing high current for operations. This distributed preliminary current consumption across multiple chips smooths out the total current demand on the supply line, preventing broadened voltage fluctuations and maintaining signal accuracy while enabling high-current operations.
3Power
If the output circuit operates in the second state with larger current consumption, then the output circuit can perform high-current operations, but the current supply line voltage becomes unstable
Solution Approach 1:
The current consumption circuit acts as a counterweight by consuming current during the blanking period. This creates a balancing effect where the current consumption during the first state offsets the current consumption increase in the second state, thereby stabilizing the current supply line voltage while allowing the output circuit to operate in high-power modes when needed.
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 stabilizes the current supply line voltage, reducing noise in signal outputs and maintaining signal accuracy by aligning current consumption levels between the blanking and output periods, thus enhancing the imaging apparatus's performance.
Implementation Method 1
a plurality of pixels each configured to photoelectrically convert incident light to generate an optical signal
Data Source
AI summary
An aspect of the present disclosure is directed to an imaging apparatus capable of reducing fluctuation in voltage in a current supply line due to fluctuation in a current consumption amount generated when an output circuit shifts from a first state to a second state, and a method for driving the imaging apparatus.