Frequency Multiplier Drain Bias Circuit Using a Voltage-Drop Diode
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Frequency multipliers face challenges in supplying suitable voltages to drain terminals due to integrated power supplies, leading to potential failures in voltage distribution, especially when the power supply voltage is higher than the suitable drain voltage.
Innovation Solution
A frequency multiplier design that includes a transistor with a gate terminal receiving input signals, a source and drain terminal connected by a main line, an output matching circuit to shut off the initial frequency while allowing multiplied frequencies to pass, a branch line with a power supply terminal, and a first diode that drops the power supply voltage to the drain terminal, minimizing voltage variation with current changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single integrated power supply is used for the frequency multiplier and peripheral circuits, then the device complexity is reduced, but the voltage distribution to individual elements becomes unsuitable
Solution Approach 1:
The power supply system is segmented into a main power supply line and a branch line with independent voltage control. The branch line includes a transistor and diode arrangement that independently adjusts the drain terminal voltage, allowing different voltage levels for different circuit sections while maintaining overall power supply integration.
Solution Approach 2:
A diode is introduced as an intermediary element in the branch line to create a controlled voltage drop. This diode acts as a mediator between the main power supply and the drain terminal, enabling precise voltage adjustment without requiring a completely separate power supply system.
2Use of energy by moving object
If the power supply voltage is set higher than the suitable drain voltage, then the power supply efficiency is improved, but the drain voltage becomes unsuitable for proper operation
Solution Approach 1:
The voltage parameter is dynamically adjusted through the diode's forward voltage drop characteristic. By selecting a diode with appropriate forward voltage, the circuit transforms the high power supply voltage into the suitable drain voltage required for proper transistor operation, maintaining both efficiency and suitability.
3Reliability
If a voltage drop circuit is added to adjust the drain voltage, then the drain voltage suitability is improved, but the device complexity increases
Solution Approach 1:
A simple diode, which is a low-cost and compact component, is used for voltage dropping instead of complex voltage regulation circuits. The diode's nonlinear voltage-current characteristic provides the necessary voltage adjustment with minimal circuit complexity.
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 design ensures a stable drain voltage close to the suitable value, limiting voltage drop variations and maintaining high output power by using a diode with low resistance in the forward-biased state, preventing signal leakage and degradation due to parasitic capacitance.
Implementation Method 1
a first diode provided in the branch line, the first diode having an anode connected to the power supply terminal and a cathode connected on the branch point side
Data Source
AI summary
A frequency includes an input terminal, an output terminal, a transistor having a gate terminal which receives input of a signal including a first frequency from the input terminal, a source terminal and a drain terminal connected to the output terminal by a main line, an output matching circuit provided in the main line, the output matching circuit shutting off the first frequency while allowing an output frequency multiplied from the first frequency to pass therethrough, a branch line including a power supply terminal for connection to a power supply, the branch line branching off from a branch point in the main line, and a first diode provided in the branch line, the first diode having an anode connected to the power supply terminal and a cathode connected on the branch point side.