Current-Controlled Delay Circuit for Linear Transmission Timing
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Solution Overview
Problem
Existing methods for controlling transmission delay on a transmission wire are limited by parasitic capacitance and require complex decoders, making it difficult to achieve high-precision, linear delay adjustments.
Innovation Solution
A delay device comprising current-controlled delay groups and switches, where each current-controlled delay group includes current-controlled delayers that provide delay based on control voltage, and switches are controlled by an enable signal to dynamically adjust the delay without an encoder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex decoders are used to program transmission delay, then the delay can be adjusted, but the linearity of adjustment is difficult to control and high-precision requirements cannot be met
Solution Approach 1:
The patent extracts the delay control function from complex decoders and implements it directly through current-controlled delayers. Each delayer provides a specific delay amount by controlling current flow, eliminating the need for complex decoding logic while achieving precise and linear delay adjustment.
Solution Approach 2:
The patent changes the control parameter from digital decoder outputs to analog current control. By adjusting the current magnitude flowing through the delayer, the delay amount can be precisely and linearly controlled, meeting high-precision requirements without complex decoding circuits.
2Adaptability or versatility
If capacitor values or pull-up/pull-down current sources are used to generate delay, then delay can be produced, but the amount of delay is difficult to control due to parasitic capacitance and has limited adjustable range
Solution Approach 1:
The patent replaces traditional mechanical/capacitive delay mechanisms with a current-controlled electronic system. The current-controlled delayer uses electric current to directly control the delay amount, eliminating the influence of parasitic capacitance and providing both wide adjustment range and high precision control.
3Ease of operation
If fixed delay values are used, then the design is simple, but dynamic adjustment of transmission delay cannot be achieved
Solution Approach 1:
The patent implements dynamic delay adjustment by making the delay amount controllable through current input. The current-controlled delayer can dynamically change the delay value by adjusting the current magnitude, enabling flexible adaptation to different timing requirements while maintaining relatively simple circuit structure.
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
Enables dynamic adjustment of transmission delay without parasitic capacitance influence and without the need for encoders, improving linearity and precision of delay control, and expanding the adjustment range and resolution.
Implementation Method 1
Each of the at least one current-controlled delay group includes a plurality of current-controlled delayers in series with each other, and each of the plurality of current-controlled delayers includes a transistor and a capacitor connected in series. The transistor and the capacitor are connected in series between a power supply voltage terminal and a reference ground terminal. A control terminal of the transistor receives the control voltage and generates a current to charge or discharge the capacitor, thereby providing a delay.
Data Source
AI summary
A delay device and a delay control method are provided. The delay device includes at least one current-controlled delay group and at least one switch. The at least one current-controlled delay group is coupled to a transmission wire, each of the at least one current-controlled delay group includes at least one current-controlled delayer, and each of the at least one current-controlled delayer provides a delay according to a control voltage. The at least one switch is coupled between the at least one current-controlled delay group and the transmission wire, and each of the at least one switch is turned on or off according to a bit of an enable signal applied thereto. In the disclosure, the generated delay can be dynamically adjusted and cannot be affected by parasitic capacitance.