Boosted Switch Control Circuit for High-Voltage Sampling Reliability
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Solution Overview
Problem
Conventional switch control circuits face reliability issues due to high driving voltage, which can lead to switch breakdown when the system supply voltage is high or the sampled analog signal has a large voltage range, causing distortion and reducing circuit reliability.
Innovation Solution
A switch control circuit comprising a clock circuit, a voltage boosting circuit, and an inverting circuit that generates and controls a switch control signal to manage the on/off state of the switch, with the voltage boosting circuit increasing the operating voltage by a preset value and the inverting circuit determining the output to the switch circuit based on clock control signals, ensuring consistent voltage boosting and preventing switch transistor breakdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the driving voltage is increased to reduce on-resistance and improve signal transmission speed, then the speed at which the analog signal passes through the switch is accelerated, but the risk that the sampling switch is broken down increases, reducing reliability
Solution Approach 1:
The patent applies dynamics by making the driving voltage adjustable rather than fixed. The voltage boosting circuit can dynamically adjust the driving voltage level based on system conditions, allowing the circuit to operate at optimal voltage levels for different scenarios, thus balancing speed performance with reliability concerns
Solution Approach 2:
The patent changes the voltage parameter dynamically through the voltage boosting circuit. By adjusting the driving voltage level according to actual system needs and adding voltage clamping protection, the system can achieve high-speed operation when needed while preventing voltage-induced breakdown, thus resolving the contradiction between speed and reliability
2Adaptability or versatility
If the system supply voltage is high or the sampled analog signal has a large voltage range, then more voltage headroom is available for signal processing, but the driving voltage on the sampling switch becomes too high, causing breakdown risk
Solution Approach 1:
The patent introduces a voltage boosting circuit as an intermediary between the power source and the switch control. This intermediary component regulates and controls the driving voltage, ensuring it remains within safe limits even when the system supply voltage or signal voltage range is high, thus preventing breakdown while maintaining adaptability
Solution Approach 2:
The patent implements feedback control through the voltage boosting circuit that monitors and adjusts the driving voltage based on system conditions. This feedback mechanism ensures the driving voltage remains appropriate for the current operating conditions, preventing over-voltage breakdown while maintaining circuit reliability across different voltage ranges
Data Source
AI summary
A switch control circuit includes: a clock circuit (110) configured to generate a first clock control signal (CLK1) and a second clock control signal (CLK2); a voltage boosting circuit (120) configured to receive the second clock control signal (CLK2) and an operating voltage outputted by the power source (VDD); and boost the operating voltage by a preset value to form a switch control signal (H1) under the control of the second clock control signal (CLK2); and an inverting circuit (130) configured to receive the first clock control signal (CLK1) and the switch control signal (H1), and determine whether or not to output the switch control signal (H1) to the switch circuit according to the first clock control signal (CLK1), so as to control on/off of the switch circuit.