Field Transistor Oscillator Circuit With Inductive Gate-Drain Delay
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Solution Overview
Problem
Existing oscillation generator circuits require multiple components and often necessitate the selection of an operating point, which can lead to instability due to potential delays between circuit elements.
Innovation Solution
An electric circuit utilizing a field transistor, inductance, and resistance, where the inductance is directly connected between the gate and drain of the transistor, intentionally introducing a delay to stabilize the operating point and generate oscillations with a minimal number of components, applicable to both enhancement-mode and depletion-mode transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional oscillation generator circuits are used with multiple components and operating point selection, then oscillation generation is achieved, but circuit complexity increases and stability decreases due to potential delays between elements
Solution Approach 1:
The patent merges the gate and drain connections through a direct inductance connection, eliminating the need for separate operating point selection components and reducing the total component count while maintaining oscillation stability
Solution Approach 2:
The patent extracts and eliminates unnecessary components from traditional oscillation circuits, retaining only the essential field transistor, inductance, and resistance elements needed for stable oscillation generation
2Reliability
If gate is connected with drain causing strong negative feedback, then operating point stability is improved, but potential instability occurs due to delay between drain and gate
Solution Approach 1:
The patent introduces an inductance element as an intermediary between the gate and drain connections, which provides the necessary delay to prevent instability while maintaining the stabilizing negative feedback effect
Solution Approach 2:
The inductance element introduces a controlled time delay that creates periodic oscillation behavior, transforming the potential instability into controlled, stable oscillations
3Device complexity
If minimal number of components is used, then device complexity is reduced, but achieving stable oscillations without operating point selection becomes difficult
Solution Approach 1:
The patent designs the circuit so that the field transistor automatically establishes its own operating point through the inductance-connected gate-drain path, eliminating the need for external operating point selection or adjustment components
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
This configuration ensures stable oscillations with minimal component requirements, eliminating the need for special operating point adjustments and reducing instability issues, while allowing for spontaneous oscillation generation.
Implementation Method 1
the inductance L1 is connected directly between the gate and the drain of the transistor T1
Data Source
AI summary
The invention relates to an electric circuit of a generator of oscillations, comprising an enhancement-mode field transistor T1, inductance L1 and resistance R1 connected to the source or the drain of the transistor T1, characterized in that the inductance L1 is connected directly between the gate and the drain of the transistor T1 or to an electric circuit of a generator of oscillations, comprising an depletion-mode field transistor T1, inductance L1 and resistance R1 connected with its one end to the source of the transistor T1, characterized in that the inductance L1 is connected directly between the gate of the transistor T1 and the other end of the resistance R1.