Ternary Pulse Generation Circuit for CCD Power Reduction
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Solution Overview
Problem
In solid-state imaging devices like CCDs, the existing technologies face challenges in reducing power consumption by controlling clock pulses for image capturing and vertical transfer, which leads to inefficiencies in storage and transfer processes.
Innovation Solution
A ternary pulse generation circuit is developed, comprising a logic circuit section and a switching control section with three switching elements, each controlled to output different voltage values (Vhigh, Vmid, and Vlow) in a switching manner, preventing simultaneous activation of multiple switching elements to minimize through current and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple switching elements are simultaneously activated to generate ternary pulses, then the pulse generation speed is improved, but the through current increases leading to higher power consumption
Solution Approach 1:
The patent implements periodic switching control where three switching elements are activated in sequential periods rather than simultaneously. Each switching element operates in a specific time window, creating a periodic activation pattern that generates ternary pulses while ensuring that at any given moment, only one switching element is active, thereby preventing through current and reducing power consumption.
2Device complexity
If the switching control is simplified to reduce circuit complexity, then the device complexity is reduced, but the control precision for preventing simultaneous activation deteriorates
Solution Approach 1:
The patent incorporates a feedback mechanism where the output states of the switching elements are monitored and fed back to the control logic. This feedback ensures that when one switching element is activated, the control system detects this state and prevents simultaneous activation of other switching elements, thereby maintaining high control precision without requiring overly complex circuitry.
Solution Approach 2:
The control circuit performs preliminary checking and preparation before activating any switching element. The control logic pre-establishes the activation sequence and ensures that the conditions for safe activation are met before enabling each switching element, preventing simultaneous activation through proactive control rather than reactive correction.
Data Source
AI summary
A ternary pulse generation circuit includes a logic circuit section including three logic elements and a switching control section including three switching elements each controlled by an output of corresponding one of the three logic elements, and the circuit outputs three different voltage values in a switching manner by controlling the three switching elements such that the three switching elements are not turned on simultaneously.