Adjustable Duty Cycle Circuit Using Configurable Transistors
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Solution Overview
Problem
Existing electronic circuit designs face inaccuracies in signal duty cycle, leading to performance degradation due to processing variations, necessitating efficient techniques for adjustment and calibration.
Innovation Solution
A circuit with configurable transistors controlled by adjustable voltages is used to generate signals with adjustable duty cycles, allowing for precise adjustment of the duty cycle by varying the turn-on and turn-off levels of transistors, enabling the generation of signals with desired pulse widths and duty cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional circuit designs are used to generate signals, then the circuit structure is simple, but the actual duty cycle differs from the specified nominal duty cycle due to processing variations
Solution Approach 1:
The patent applies dynamics by making the circuit adjustable through configurable transistors that can be selectively turned on or off. This allows the duty cycle to be dynamically tuned to compensate for processing variations, transforming a static circuit into an adjustable one that adapts to achieve the desired duty cycle accuracy.
Solution Approach 2:
The patent changes physical parameters by introducing controllable transistors whose conductance states can be adjusted. By changing the on/off states of these transistors, the circuit modifies its electrical characteristics (such as resistance and current flow) to precisely control the duty cycle, thereby achieving manufacturing precision through parameter adjustment.
2Reliability
If the duty cycle is adjusted to compensate for inaccuracies, then the signal performance is improved, but the circuit complexity increases due to additional configurable transistors and control voltages
Solution Approach 1:
The patent applies segmentation by dividing the circuit into modular sections with configurable transistors that can be independently controlled. This modular approach allows selective adjustment of specific circuit portions to achieve the desired duty cycle without requiring complete redesign of the entire circuit, thereby managing complexity through structured segmentation.
Solution Approach 2:
The configurable transistors serve multiple functions: they act as switches for duty cycle adjustment, as part of the signal generation path, and as adjustable elements for compensation. This multi-functionality reduces the need for separate dedicated adjustment components, thereby improving reliability while controlling circuit complexity.
3Manufacturing precision
If processing variations occur in conventional circuits, then manufacturing is simpler, but the actual duty cycle deviates from the specified value
Solution Approach 1:
The patent applies preliminary action by pre-configuring adjustable elements (configurable transistors) into the circuit design that can be tuned after manufacturing. This allows the circuit to be manufactured with standard processes and then adjusted to achieve precise duty cycle specifications, separating the manufacturing simplicity from the precision requirement.
Data Source
AI summary
Techniques are disclosed for adjusting and programming the duty cycle of a signal generated by a circuit. In an embodiment, parallel transistors are coupled between a NAND gate and a supply voltage. Selectively enabling the parallel transistors adjusts the switching point of the NAND gate, thereby allowing control of the pulse width of the output signal. In an alternative embodiment, the size of the PMOS versus the NMOS transistors in the NAND gate is selectively varied to achieve the same effect. Further disclosed are applications of the techniques to calibrating the receiver to minimize measured second-order inter-modulation products and/or residual sideband.