Bias Wiring Capacitance for Distortion Compensation Circuits
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Solution Overview
Problem
Distortion compensation circuits with bias circuits face degradation in distortion characteristics due to parasitic inductance in long wiring connections, which reduces the effectiveness of resistors in improving distortion characteristics.
Innovation Solution
Incorporating a capacitive element connected to the wiring to cancel at least part of the parasitic inductance, which can be achieved by using a second capacitor in series with the wiring and a third resistor in parallel, or by placing the capacitive element on a path connecting the wiring and a ground, thereby enhancing the cancellation of parasitic inductance and maintaining high distortion characteristics even with long wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a long wiring is used to connect the input terminal and the bias circuit, then the wiring length increases, but parasitic inductance is produced in the wiring which lessens the effect of reducing distortion by the resistor
Solution Approach 1:
A capacitive element is introduced as an intermediary component between the resistor and the bias circuit. This capacitor cancels the parasitic inductance effect by creating a compensating capacitive reactance that opposes the inductive reactance, thereby maintaining the resistor's distortion reduction effect even with long wiring connections.
Solution Approach 2:
The invention changes the electrical parameters of the connection path by adding a capacitive element. By selecting an appropriate capacitance value, the capacitive reactance is tuned to cancel the parasitic inductance at the operating frequency, transforming the overall impedance characteristics of the bias circuit connection.
2Adaptability or versatility
If the wiring between the bias circuit and the amplifier circuit is made longer, then the circuit layout flexibility improves, but the parasitic inductance increases and degrades the distortion characteristics
Solution Approach 1:
The capacitive element serves as a mediator that compensates for the increased parasitic inductance in long wiring. By placing the capacitor in series with the bias circuit connection, it creates an LC resonant circuit that cancels the inductive effect, enabling flexible layout without sacrificing distortion performance.
Solution Approach 2:
The invention converts the harmful parasitic inductance into a beneficial effect by using it as part of an LC resonant circuit with the capacitive element. The parasitic inductance, instead of being merely a detrimental factor, becomes a functional component that, when properly tuned, cancels itself out and enables the circuit to achieve desired impedance characteristics.
3Manufacturing precision
If a resistor is connected between the input terminal and the bias circuit to reduce distortion, then the distortion characteristics improve, but the effect is lessened when long wiring with parasitic inductance is used
Solution Approach 1:
The capacitive element is introduced as a mediator between the resistor and the bias circuit to counteract the parasitic inductance. This capacitor ensures that the resistor's distortion reduction function remains effective by canceling the inductive reactance that would otherwise interfere with the resistor's operation.
Solution Approach 2:
The capacitive element provides preliminary anti-action by pre-compensating for the parasitic inductance before it can degrade the distortion characteristics. By selecting the capacitance value to match the inductance, the circuit is pre-configured to cancel the harmful inductive effect across the operating frequency range.
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
The capacitive element effectively counters the negative impact of parasitic inductance on distortion reduction, allowing the distortion compensation circuit to maintain high distortion characteristics even with longer wiring connections, thus enhancing the overall performance.
Implementation Method 1
The capacitive element is connected to the wiring so as to cancel at least part of parasitic inductance produced in the wiring
Data Source
AI summary
A distortion compensation circuit includes an amplifier circuit, a bias circuit, a wiring, and a capacitive element. The bias circuit applies a bias voltage to the amplifier circuit. The wiring connects the amplifier circuit and the bias circuit. The capacitive element is connected to the wiring to cancel at least part of parasitic inductance produced in the wiring. The amplifier circuit includes an input terminal, an amplifier, a first capacitor, a connection node, and first and second resistors. An input signal is inputted into the input terminal. The amplifier amplifies the input signal. The first capacitor is disposed on a path connecting the input terminal and the amplifier. The connection node is disposed between the bias circuit and the amplifier. The first resistor is disposed on a path connecting the input terminal and the connection node. The second resistor is connected between the amplifier and the connection node.