| STMicroelectronics R&D (Shanghai) Co., Ltd. Patent applications |
| Patent application number | Title | Published |
|---|
| 20110156763 | RESPONSE OF AN UNDER-DAMPED SYSTEM - An embodiment of a circuit for driving an under-damped system comprises first and second signal generators. The first generator is operable to generate a first drive signal. And the second generator is operable to receive the first drive signal and a second drive signal, and to generate from the first and second drive signals a system drive signal having a first amplitude for a first duration and having a second amplitude after the first duration, the system drive signal operable to cause the under-damped system to operate in a substantially damped manner. Either or both of the first and second generators may be programmable such that one may adjust the response of any under-damped system by generating an appropriate drive signal instead of by physically modifying the system itself. In another embodiment, an under-damped system is caused to oscillate at a damped frequency having a first phase, and is also caused to oscillate at substantially the damped frequency having a second phase such that the oscillation at the first phase substantially cancels the oscillation at the second phase. Such embodiments may allow one to realize a faster settling time without slowing down the response time of an under-damped system. | 06-30-2011 |
| 20110075308 | System and Method for Short Circuit Protection - In one embodiment, a system for providing short circuit protection is disclosed. The system has a supply circuit and a series switch. The supply circuit has a supply input and a supply output, and is configured to deliver an output current at the supply output, and to disable the supply output if the output current exceeds a first current limit. The series switch coupled between the supply output of the supply circuit and a supply node, and the supply node is configured to be coupled to a load. | 03-31-2011 |
| 20110074328 | System and Method for Detecting a High Current Condition in a Motor - In one embodiment, a system for controlling a motor is disclosed. The system has a driver circuit configured to drive a motor, a current sensing impedance coupled to the driver circuit, and an overload detection circuit coupled to the current sending impedance that has a transistor and a detection output node. | 03-31-2011 |
| 20110018510 | ADAPTIVE MILLER COMPENSATED VOLTAGE REGULATOR - A linear voltage regulator includes a Miller frequency compensation having a movable zero, which tracks the frequency of the load pole as the load condition changes. The compensated voltage regulator maintains stability under variable load conditions. Because of the Miller effect, DC open-loop gain and bandwidth are not sacrificed for stability. The compensated voltage regulator can therefore maintain high power supply rejection ratio (PSRR). | 01-27-2011 |
| 20100169898 | UNIFIED DRIVING METHOD AND UNIFIED DRIVER APPARATUS - The present invention provides a technical solution for a unified driver used in a handheld device. An embodiment of the technical solution may comprise a unified driving method used in a handheld device, which method may comprise: determining driver types of currently installed hardware; setting a current dispatch table on the basis of the driver type and a unified dispatch table suitable for multiple hardware and driving corresponding hardware or software by calling the current dispatch table. | 07-01-2010 |
| 20090237125 | POWER EFFICIENT PUSH-PULL BUFFER CIRCUIT, SYSTEM, AND METHOD FOR HIGH FREQUENCY SIGNALS - A buffer circuit includes a biasing circuit operable to generate first and second biasing signals. A capacitive network includes an input adapted to receive an input signal and the capacitive network is operable responsive to the input signal to generate first and second bootstrapped signals. A push-pull stage includes first and second control inputs and an output. The push-pull stage is coupled to the biasing circuit to receive the first and second biasing signals on the first and second control inputs, respectively, and is coupled to the capacitive network to receive the first and second bootstrapped signals on the first and second control inputs, respectively. The push-pull stage is operable to generate a buffered output signal on the output responsive to the first and second bootstrapped signals. | 09-24-2009 |
