Clock Signal Duty-Cycle Control Using Feedback Threshold Adjustment
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Solution Overview
Problem
Existing circuit arrangements for providing clock signals with adjustable duty cycles lack precise control and stability, particularly in the presence of disturbances or electrical loads, which can affect the accuracy of the duty cycle.
Innovation Solution
A circuit arrangement comprising an amplifier circuit, a low-pass filter, and an integrator circuit, where the integrator circuit provides a threshold value for controlling the duty cycle, and feedback mechanisms ensure that any changes in the duty cycle are counteracted, maintaining the original duty cycle accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing circuit arrangements are used for providing clock signals, then basic clock signal generation is achieved, but precise control and stability of the duty cycle cannot be maintained under disturbances or electrical loads
Solution Approach 1:
The patent implements a feedback mechanism where the clock signal is fed back through a low-pass filter and integrator circuit to generate a threshold value that is compared with the oscillator signal. This closed-loop feedback system continuously monitors and adjusts the duty cycle, ensuring precise control and stability even under disturbances or electrical loads by counteracting any deviations from the desired duty cycle.
Solution Approach 2:
The patent introduces an integrator circuit as an intermediary element between the low-pass filter and the comparator. This integrator circuit processes the feedback signal and generates a stable threshold value that mediates the comparison process, enabling precise duty cycle control by smoothing out variations and providing a stable reference for the comparator to maintain accurate duty cycle under varying conditions.
2Measurement precision
If simple circuit arrangements are used, then device complexity is reduced, but precise adjustment and stabilization of the duty cycle cannot be achieved
Solution Approach 1:
The patent segments the duty cycle control function into distinct modular components: an amplifier circuit for signal conditioning, a low-pass filter for noise reduction and signal smoothing, and an integrator circuit for threshold value generation. This segmentation allows each component to perform its specific function with high precision while maintaining overall system manageability and adjustability through individual component optimization.
Solution Approach 2:
The patent employs dynamic elements including an adjustable threshold value mechanism and a buffer with inverter(s) that can adapt their operation based on the feedback signal. The integrator circuit dynamically adjusts the threshold value in response to duty cycle deviations, and the buffer dynamically compensates for phase shifts, enabling precise duty cycle adjustment and stabilization through dynamic adaptation rather than fixed parameters.
Data Source
AI summary
The circuit arrangement (1) comprises an input (2) for the connection of an oscillator (3) and an amplifier circuit (20) having a first input (21) that is coupled to the input (1) of the circuit arrangement (1), having a second input (22) and an output (23) that is connected to an output (4) of the circuit arrangement (1). A clock signal (Vout) with a duty cycle (φ) can be accessed at the output (4) of the circuit arrangement (1). The circuit arrangement (1) furthermore incorporates a low-pass filter (40), the input of which is connected to the output (23) of the amplifier circuit (20), and an integrator circuit (50) the input of which is connected to the low-pass filter (40) and the output of which is connected to the second input (22) of the amplifier circuit (20) for the delivery of an adjustable threshold value (Vth) for controlling the duty cycle (φ).