40results about How to "Increase low frequency gain" patented technology

A low-dropout linear regulator that uses the built-in compensation network of the amplifier to improve performance. By building a compensation network composed of resistors and capacitors in the amplifier, it can be used in the feedback loop without changing the quiescent operating point of the amplifier and without increasing the quiescent current. One or more zero-pole pairs whose zero frequency is lower than the pole frequency are added to the transfer function of the circuit. The frequency of these zero-pole pairs can be accurately determined to enhance the stability of the feedback loop of the low-dropout linear regulator and expand the loop. The unity gain bandwidth increases the phase margin and DC and low frequency gain of the loop, thereby improving the performance of the low dropout linear regulator.

A high-precision control method for a piezoelectric ceramic executor relates to the technical field of high-precision micro electro mechanical systems and servos, and overcomes the shortage of a conventional control method for the piezoelectric ceramic executor. The piezoelectric ceramic executor comprises a piezoelectric ceramic linear interference observer, a feedback controller and a linear front feed, wherein the piezoelectric ceramic linear interference observer is used for converting factors such as piezoelectric ceramic nonlinear retardation, external interference, inertia force and other unmodeled dynamics into equivalent interference in a united way and achieving observation and compensation of the equivalent interference so as to guarantee the linearity of the response characteristics of the piezoelectric ceramic executor; the feedback controller comprises an integration element and a double integral element for guaranteeing the tracking accuracy of the piezoelectric ceramic executor to an instruction; and the linear front feed is used for directly acting a position instruction onto the piezoelectric ceramic executor according to the linearized characteristics of the piezoelectric ceramic executor to improve the dynamic performance of the executor. The high-precision control method does not depend on a nonlinear retardation model, is simple and reliable, and improves the servo accuracy of the piezoelectric ceramic executor.

The invention discloses a balance antipodal Vivaldi antenna adopting unsymmetrical medium rejection and mixed grooving and relates to the field of antennas. While low cross polarization of a traditional balance antipodal Vivaldi antenna is kept as an advantage, the problem that due to asymmetry of the traditional balance antipodal Vivaldi antenna, a main lobe of the E face of the antenna deviates is solved. Each floor metal layer is attached to the lower surface of a medium substrate layer, a conductor metal layer is attached to the upper surface of the lower medium substrate layer, the conductor metal layer and the floor metal layers extend to the two sides respectively to form metal arms, the metal arms formed by the floor metal layers and the metal arm formed by the conductor metal layer are symmetrical in structure, the outer sides and the inner sides of the metal arms are of curve structures, the lower medium substrate layer located between the curve on the inner side of the conductor metal layer and the curve on the inner side of the lower floor metal layer is rejected, and the rejected lower medium substrate layer is provided with one more medium section compared with the curves on the inner sides of the floor metal layers. The balance antipodal Vivaldi antenna is used for working within the working frequency of 10-40 GHz.

The invention relates to a high gain broadband dielectric lens Vivaldi antenna. The array antenna comprises a substrate, a radiation slot, a dielectric lens and a Chebychev tapered strip line feeder. According to the high gain broadband dielectric lens Vivaldi antenna, through changing the structural size of the dielectric lens, the fluctuation of antenna radiation impedance can be effectively improved so as to obtain better impedance matching, the transmission speed of an electromagnetic wave in the slot can be reduced according to the high dielectric constant of the lens, the current distribution on an antenna aperture is improved, thus a spherical wave is a nearly a plane wave, the antenna radiation efficiency is raised, and a higher antenna gain is obtained. According to a Chebychev tapered strip line, the impedance matching of the antenna can be improved further, and the working band is broadened. The array antenna in the invention has the characteristics of high gain and broad band and is suitable for a radiation unit of wideband array antennas of the field of mobile communication and a military radar.

The invention discloses a switching current integrator circuit for a high power density step-down switch converter, which comprises four capacitors, four transmission gates, fourteen NMOS tubes, fifteen PMOS tubes and a current source. These components are connected to each other to form a switching current circuit, so that the transfer function is equivalent to an integrator, which improves the low-frequency gain, and introduces an adaptive zero point to keep the Buck loop stable at different switching frequencies, reducing the chip area and solving the problem. The traditional error amplifier needs to introduce off-chip compensation, and the buck converter has a problem of poor transient response when the bandwidth is fixed at high frequencies.