4results about How to "Reduce equivalent impedance" patented technology

The application provides a harmonic suppression radio frequency power amplifier, wherein one end of an input matching circuit is connected with a radio frequency input end; the other end of the input matching circuit is connected with a base of a power amplifier tube; a collector of the power amplifier tube is connected with a power supply voltage through a first matching branch; an emitter of the power amplifier tube is connected with a first connecting point on a packaging substrate; the collector of the power amplifier tube is connected with a radio frequency output end through a second matching branch; the second matching branch is connected with the packaging substrate; a first end of a harmonic control circuit is connected with the collector of the power amplifier tube; a second end of the harmonic control circuit is connected with a second connecting point on the packaging substrate; a metal layer farthest from the power amplifier tube in a plurality of metal layers of the packaging substrate is a first metal layer; the first connecting point and the second connecting point are located on a second metal layer in the plurality of metal layers, and the first connecting point is connected with the second connecting point; and the second metal layer is a metal layer closest to the power amplifier tube in the plurality of metal layers.

The invention discloses a fingerprint reading circuit, a fingerprint identification module, a display assembly and electronic equipment, and belongs to the technical field of fingerprint detection. The fingerprint reading circuit comprises an operational amplifier, and the inverted input end of the operational amplifier is connected with the induction electrode; the first end of the feedback capacitor is connected with the inverted input end of the operational amplifier, and the second end of the feedback capacitor is connected with the output end of the operational amplifier; the first end of the bleeder circuit is connected with the induction electrode, and the second end of the bleeder circuit is grounded; or the first end of the bleeder circuit is connected with the first end of the feedback capacitor, and the second end of the bleeder circuit is connected with the second end of the feedback capacitor.

The invention discloses a multi-role integrated common mode choke for a Marx generator. The multi-role integrated common mode choke comprises a foil type capacitive winding and a trigger switch. The foil type capacitive winding is formed by alternately stacking metal foils and insulating films and rolling the metal foils and the insulating films in parallel in the circumferential direction, the insulating films are arranged between the adjacent metal foils, and the metal foils and the insulating films jointly form an energy storage capacitor; each metal foil is a winding, two ends of each foil type capacitive winding are respectively provided with a lead, the head end and the tail end of each foil type capacitive winding are dotted terminals, and when the foil type capacitive windings work in a differential mode state, the foil type capacitive windings are connected with a charging power supply through low impedance. Current flows in from the dotted terminal of one foil type capacitive winding and flows out from the dotted terminal of the other foil type capacitive winding. As a basic unit, the multi-role integrated common mode choke can replace a traditional charging and discharging resistor, an energy storage capacitor and a trigger switch, is cascaded to form the Marx generator, is short in charging time, high in charging and discharging efficiency, capable of working at high repetition frequency, modularized and compact in structure.

The invention relates to the technical field of sum-difference devices, and particularly discloses a ridge waveguide broadband sum-difference device with a compact structure. In the sum-difference device, a feed unit adopts a coaxial structure, a coaxial connector of the feed unit is combined with a cavity of the sum-difference device, and a pin head of the connector is jacked into a metal conductor in the cavity of the sum-difference device to excite and generate a signal; the feed unit adopts the outer skin of the coaxial connector and the cavity shell to be grounded, and all the feed ports are in the same plane; according to the feed structure, the space occupied by the sum-difference device can be saved, the coaxial connector can be connected in an opposite insertion mode, and the stability between the sum-difference device and an antenna system is improved; the ridge waveguide structure is integrally in the shape of an inverted Chinese character'ao ', the use bandwidth can be increased through the through arrangement of the ridge waveguide, the equivalent impedance of the ridge waveguide structure is low, the ridge waveguide structure can be easily matched with a low-impedance coaxial line, and the ridge waveguide structure is quite suitable for being used in a radar system.