2results about How to "Reduce energy transfer" patented technology

The application provides a substrate and a surface acoustic wave multiplexer, the substrate comprising at least one electromagnetic regulation structure; the electromagnetic regulation structure is configured to reduce the transmission energy of signals in the target frequency band on a parasitic coupling path when a surface acoustic wave multiplexer chip carried on the substrate is working; wherein the parasitic coupling path is formed between at least one transmitting port and at least one receiving port of the surface acoustic wave multiplexer chip. Based on the substrate provided by the embodiments of the application, the passband performance guarantee and the isolation suppression function of the surface acoustic wave multiplexer can be decoupled, allowing the signal leakage path of the target frequency band to be suppressed through the electromagnetic regulation structure of the substrate without changing the design of the surface acoustic wave multiplexer chip itself, thereby realizing flexible and effective improvement of the isolation of the surface acoustic wave multiplexer without affecting the core passband indicators of the surface acoustic wave multiplexer.

The application is suitable for the technical field of switching power converter, and provides a negative voltage charge pump circuit and a switching power converter. The negative voltage charge pump circuit adds a clock modulation module, a reference voltage generation module, a comparison module, a fourth driving module, a fifth power tube, a sixth power tube and a seventh power tube on the existing charge pump. When the negative voltage charge pump circuit enters a light load working condition, the large-size power tube and its driving module are closed, only the small-size power tube is kept working, and the small-size power tube automatically judges whether to work according to the absolute value of the output voltage, so that the working current of the negative voltage charge pump circuit is greatly reduced, and the conversion efficiency of the negative voltage charge pump circuit in the light load is improved. At the same time, the pulse width modulation processing is carried out by means of the narrow pulse modulation unit in the clock modulation module, the clock signal for driving the small-size power tube is optimized, and the circuit power consumption in the light load is further reduced.