53results about How to "Stable static operating point" patented technology

An ultra-low noise analog amplifier for a three-dimensional resistivity data acquisition system, including two parts, the first part is a direct-coupled voltage series negative feedback ultra-low noise amplifier composed of six transistors, and the second part is composed of three operational amplifiers low noise amplifier. In the first part, the emitter of the second stage provides a bias current to the base of the first stage. While obtaining the bias current, a DC negative feedback is introduced to make the static operating point of the circuit more stable. Adding to the bias current feedback circuit The capacitance is added, which greatly improves the input impedance of the amplifying circuit; the second part is two non-inverting input universal integrated operational amplifiers with highly consistent performance parameters, with double-ended signal input and only single-ended signal output, common mode rejection ratio Very high, it has a very good effect on electromagnetic field interference suppression, and can make the measurement accuracy below 0.1μV, which can greatly reduce the weight of field sending equipment and receiving equipment, and greatly improve the efficiency of electrical exploration work.

The invention relates to a crystal oscillating circuit, which comprises an oscillating stage circuit, a direct current negative feedback circuit, and a push-pull amplifier circuit. The oscillating stage circuit generates an oscillator signal and outputs the oscillator signal to the direct current negative feedback circuit; the direct current negative feedback circuit performs amplitude control on the oscillator signal of the oscillating stage circuit and feeds back the oscillator signal to the oscillating stage circuit; the oscillating stage circuit outputs the oscillator signal which is subjected to the amplitude control to the push-pull amplifier circuit by the direct current negative feedback circuit; and the push-pull amplifier circuit is a post-stage amplifying circuit, amplifies the oscillator signal which is input and subjected to the amplitude control and outputs the oscillator signal to the outside. According to the invention, a transistor V5 adopts an emitter follower, so that an output load of the crystal oscillating circuit is less, and oscillation starting of the crystal is facilitated; and the capacitance of a capacitor which is connected in series with the crystal is increased, so that the capacitive reactance of the capacitor in the circuit is reduced, an alternating current which runs through the crystal is increased, and the driving power of the crystal is increased.

The invention discloses a waterproof and stable triode and a preparation method thereof, comprising a tube body, a base pin, an emitter pin, a collector pin, a rubber inner shell, a protective inner shell, a rubber shell, a protective shell, and a locking screw. Hole, locking screw, rubber backing plate, protective cover, heat dissipation grid, heat conduction groove, heat conduction silicone column, heat conduction silica gel plate, positioning groove, positioning column, connection groove, connection block, connection screw hole, connection screw, fixing ring , annular sealing groove, rubber sealing ring and limit ring; the invention optimizes the packaging structure, enhances the waterproof performance of the triode, prevents water seepage during use, protects the insulating layer of the triode, improves the safety of the triode, and optimizes the The heat dissipation structure enhances the heat dissipation performance of the triode, thereby completely conducting the excess heat inside the triode to the outside, avoiding the problem of high temperature overheating of the triode during use, and the static operating point is more stable, ensuring the conductivity of the triode.