110 results about "Differential gain" patented technology

An electronic imaging chip containing an array of photodiodes includes a multiplexed column buffer. The multiplexed column buffer serves a plurality of columns in the photodiode array. By multiplexing active amplifier elements, such as the differential gain amplifiers and the bus driver amplifiers, a wider area than one column width is available on the semiconductor chip for layout of the column buffer. In the disclosed embodiment, 4 columns share a common multiplexed column buffer. The area available for layout of the multiplexed column buffer is 4 times as wide as compared to that for a non-multiplexed column buffer.

The present invention relates to a display device which can provide optimal luminance and visibility to viewers by considering a viewing environment, a viewing distance and image characteristics in an associated manner and a method for driving the same. The method for driving a display device includes: determining final luminance by applying sensed results of ambient illumination, ambient temperature and a viewing distance from a user in an associated manner; adjusting luminance of the display device according to the determined final luminance; and calculating a weighted average picture level (WAPL) from an input image, calculating a differential gain per gray level according to the calculated WAPL, correcting the input image by applying the calculated differential gain per gray level to the input image and outputting the corrected input image.

The invention discloses a microwave differential gain-based coherent Doppler wind lidar. According to the technical scheme of the invention, a balanced detector is connected with a bandpass filter, so that invalid signals, away from the Doppler frequency shift, are filtered and eliminated. A pre-amplifier is adopted to amplify an electrical signal outputted by the detector. Meanwhile, a power divider is adopted to divide amplified electrical signal into a monitoring channel and a detection signal. The detection signal is filtered by a pre-emphasis filter. The frequency-domain change of the detection signal is converted to the intensity change of the signal. Through the comparison with the monitoring channel and the transmittance curve of the pre-emphasis filter, the Doppler shift information is obtained. The interference of invalid echo signals is reduced. By adopting the pre-emphasis filter, echo signals are subjected to frequency discrimination, so that the computation amount of signal processing is reduced. The sensitivity and the signal-to-noise ratio of the system are improved. The coherent Doppler wind lidar is higher in resolution distance.

The invention discloses a single ended differential gain amplifier with a configurable radio frequency broadband gain. The gain amplifier comprises a single ended differential circuit with a configurable gain, a broadband amplifying circuit with the configurable gain and a buffer driving circuit with the configurable gain which are sequentially connected in series. Gain control ends of the circuits are connected with a gain control signal from an outer digital base band processing module to form a gain value of the single ended differential gain amplifier with the configurable radio frequency broadband gain in combination, according to the control of each circuit at a set fixed step pitch, fine adjustment on the gain is implemented, thus a range of the broadband signal output by the differential conforms to a range value of a set signal, and strong disturbance is effectively restrained. Since the strong detection and processing capability of a digital processing module chip of the outer base band is good for a gain control mode, the gain control is enabled not to be affected from temperature, process, noise and the like, and more precise and flexible control can be realized. The control range of the gain is a summation of the maximum gain control ranges of the three circuits with the configurable gains, so that the gain amplifier is suitable for application of the high dynamic input with strong disturbance or weak signal, and is suitable for a radio frequency chip with multiple frequencies and multiple modes of a single ended broadband radio frequency signal input.

The invention discloses a coordinated control system for a DG (Differential Gain) of a multi-time scale active power distribution network. A local optimized target in each control subarea and an optimal capacity of each distributed generating unit under the condition of a long time scale are solved according to an optimal target function of an active power distribution network. On the basis of optimal running, according to the control subarea autonomy, the optimal target function is controlled to realize the real-time coordinated control on each DG in the area. The coordinated control system realizes the coordination for the global optimization and local autonomy of a distributed energy resource accessed to the active power distribution network, so that the network is under a more optimized running state and the utilization for the distributed energy resource is increased. Meanwhile, the influence of different time scales is considered, the economical efficiency of the system running is enhanced, the running robustness is optimized, and the popularization and application of the distributed energy resource are more benefited.

Provided is a time delay system PID controller stabilization method based on data drive. The time delay system PID controller stabilization method based on the data drive comprises the steps of firstly using relay identification of multiple frequency points, giving input frequency domain response data of a controlled time delay object and output frequency domain response data of the controlled time delay object, and extracting characteristic parameters; then obtaining the maximum permissible stabilization range of proportional gain k

in a PID controller through necessary conditions of PID stabilization; for a fixed k

value, obtaining a necessary and sufficient condition which can enable a closed-loop system to be stable, and determining a two-dimensional parameter domain which can enable the closed-loop system to be stable and relates to differential gain k<d> in the PID controller and integral gain k in the PID controller; and determining a two-dimensional stabilization domain with a convex polygon characteristic of the (k<d>, k) to ergodic points of each k

through going through the maximum permissible stabilization range of the k

, and obtaining a stabilization set of the PID controller. As long as a control parameter is selected from the obtained stabilization set of the PID controller, the stability of the closed-loop system can be ensured. According to the time delay system PID controller stabilization method based on the data drive, under the condition that a transfer function of the time delay object or a state space model of the time delay object does not need to be obtained, the PID controller stabilization method is offered based on frequency response data, complex calculation processes of pattern identification are avoided, and an approach which is simple and effective is offered for the design of a PID controller without a model time delay system.