Differential Amplifier Circuit With Harmonic Attenuation Network
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Solution Overview
Problem
Existing high-frequency circuits for differential amplification do not consider harmonic components, leading to inefficiencies and signal interference.
Innovation Solution
Incorporation of a series circuit with inductors and capacitors in the differential amplifier circuit to attenuate harmonic components, specifically using a series circuit with identical inductors and capacitors to bypass and attenuate odd-order harmonics, and a serial resonance circuit to attenuate even-order harmonics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional differential amplifier circuit is used, then the circuit structure is simple, but harmonic components are not attenuated leading to signal interference
Solution Approach 1:
The patent introduces a series circuit as an intermediary component between the differential amplifier's output terminals. This series circuit, containing inductors and capacitors, acts as a mediator that selectively attenuates harmonic components without affecting the fundamental signal, thus resolving the contradiction between maintaining simple circuit structure and achieving harmonic attenuation.
Solution Approach 2:
The patent changes the electrical parameters of the circuit by adding reactive components (inductors L1-L4 and capacitors C1-C2) with specific values. These parameter changes create frequency-selective attenuation characteristics that target harmonic frequencies while preserving the fundamental signal, solving the problem of harmonic interference without requiring complete circuit redesign.
2Reliability
If no harmonic attenuation is implemented, then the circuit complexity is low, but signal interference occurs due to harmonic components
Solution Approach 1:
The series circuit serves as an intermediary filtering stage that improves signal integrity by removing harmonic components. The inductors and capacitors in this intermediary circuit create impedance characteristics that selectively block harmonics while allowing the fundamental frequency to pass, thereby enhancing reliability without major structural changes.
Solution Approach 2:
The patent segments the differential amplifier circuit by adding a separate series circuit module with specific filtering functionality. This segmentation allows the main amplifier circuit to remain simple while the added series circuit handles the harmonic attenuation function, improving signal integrity without significantly increasing overall 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
Effectively attenuates harmonic components, reducing signal interference and maintaining signal integrity in high-frequency communication systems.
Implementation Method 1
a series circuit with identical inductors and capacitors to bypass and attenuate odd-order harmonics
Implementation Method 2
The series circuit includes a first inductor, a second inductor, and a capacitor
Implementation Method 3
a serial resonance circuit to attenuate even-order harmonics
Data Source
AI summary
To provide a high-frequency circuit and a communication device by which a harmonic component in differential amplification can be attenuated. The high-frequency circuit includes a differential amplifier circuit. The differential amplifier circuit includes a first amplifying element, a second amplifying element, first wiring, second wiring, and a series circuit. The first amplifying element includes a first input terminal and a first output terminal. The second amplifying element includes a second input terminal and a second output terminal. The first wiring is connected to the first output terminal. The second wiring is connected to the second output terminal. The series circuit is connected between the first wiring and the second wiring. The series circuit includes a first inductor, a second inductor, and a capacitor.