2 results about "Common emitter" patented technology

This invention discloses a method for improving the stability and gain of a millimeter-wave differential amplifier core. The stability and gain improvement comprises common-mode rejection enhancement and differential-mode gain enhancement. The millimeter-wave differential amplifier core includes a common-emitter amplifier circuit composed of a first transistor and a second transistor, and a common-base amplifier circuit composed of a third transistor and a fourth transistor. A first bias resistor and a second bias resistor are connected in series between the two bases of the first and second transistors. A third bias resistor and a fourth bias resistor are connected in series between the two bases of the third and fourth transistors. The emitter of the third transistor is connected to the collector of the first transistor, and the emitter of the fourth transistor is connected to the collector of the second transistor. A bridging capacitor is also connected between the two bases of the third and fourth transistors. This invention significantly improves the differential-mode gain characteristics of the millimeter-wave band amplifier core while simultaneously enhancing common-mode rejection by combining series capacitors with common-mode gain reduction.

The application discloses a gas-restraint type carbon nanotube field ionization thruster, which comprises a first pole plate, a second pole plate, a gas restraint plate, a sealing ring, a first shell and a second shell. The second pole plate is provided with carbon nanotube clusters with gaps generated by chemical vapor deposition and chemical point covering method, and the carbon nanotube clusters have larger tip electric field and higher ionization efficiency than common emitters, but the distribution of the carbon nanotube clusters is relatively sparse. The gas restraint device cooperates with the carbon nanotube clusters of the emitters to ensure that the carbon nanotube clusters have independent ionization spaces, avoids the working medium gas from escaping into the gaps of the carbon nanotube clusters, and thus improves the ionization efficiency. Meanwhile, the gas restraint device can further shield the electric field influence between the carbon nanotube clusters, avoids the mutual interference between different carbon nanotube clusters during propulsion, improves the controllability of the thruster, and further improves the ionization efficiency. The device can reduce the waste of the working medium gas and improve the service life of the thruster.