What are the best practices for using two-channel amplifiers to build stable and reliable audio and video systems?
Publish Time: 2025-04-10
In the construction of audio and video systems, two-channel amplifiers are core components, and their performance directly affects the stability and reliability of the system. The system performance can be effectively improved by properly designing power supply, layout and wiring, grounding processing, and selecting suitable amplifier chips.Technology selection: Adapting to scenario requirementsThe selection of two-channel amplifiers needs to be matched according to the power, frequency range, and noise requirements of the application scenario. In the field of biomedical imaging, the system amplifier needs to have high sensitivity and low noise characteristics to enhance the acquisition capability of weak signals.Circuit design: ensuring stability and anti-interference abilityThe design of the power supply part needs to use transformers and rectifier filter circuits to ensure the stability and energy supply of the power supply. For example, in automotive applications, the dual 12V transformer power supply solution can effectively cope with voltage fluctuations. When laying out and wiring, the signal transmission path should be shortest and the interference should be minimized, especially the high-frequency characteristics of audio signals require reasonable component layout. In terms of grounding processing, single-point grounding or multi-point grounding technology needs to be selected according to the complexity of the design to reduce noise and interference.In the feedback path design, the dual-channel feedback RISO technology isolates the feedback path and prevents mutual interference by setting the resistor Riso at the output. The specific implementation includes: directly connecting the capacitive load through the resistor RF to ensure low-frequency stability; providing high-frequency feedback through the capacitor CF to enhance the stability of the system over a wide frequency range. In addition, the closed-loop negative feedback architecture can significantly improve audio performance, enhance the control of the speaker, and achieve excellent power supply rejection ratio (PSRR).Performance optimization: improving dynamic range and anti-interference abilityDynamic range optimization can be achieved by selecting an amplifier with track-to-track input and output (RRIO) capabilities. Its low quiescent current characteristics can significantly extend the operating time in battery-powered devices.The improvement of anti-interference ability requires the combination of filter design and shielded cable application. Low-pass, band-pass and notch filters can effectively suppress noise at specific frequencies, while shielded cables can reduce external electromagnetic interference. In the field of quantum optics, the dual-channel ultra-high frequency lock-in amplifier further enhances the system's anti-interference ability by selecting a high-frequency signal source with stable frequency and phase.Maintenance management: ensuring long-term reliabilitySystem calibration is a key step to ensure dual-channel stability. Equipment aging needs to be checked regularly and damaged parts need to be replaced in a timely manner. For example, if the supply voltage is insufficient, a power supply with appropriate power needs to be replaced. Adjustment of gain and attenuation settings ensures signal balance in dual channels, while temperature adaptability design can cope with extreme environments.In automotive applications, the digital connection characteristics of Class D amplifiers can work with DSP to save the cost of integrated ADCs while improving performance through device structure and process improvements. For example, the closed-loop architecture significantly improves bass response and dynamic range through tighter signal replication.The stability and reliability of two-channel amplifiers depend on the comprehensive practice of technology selection, circuit design, performance optimization and maintenance management. By matching application scenario requirements, optimizing circuit design, improving dynamic range and anti-interference capabilities, and establishing a complete maintenance mechanism, an efficient and stable audio and video system can be built to meet the diverse needs of home theater, car entertainment and professional audio equipment.
