摘要:
The disclosure is directed to a power conversion circuit (100) including a bypass circuit (70) for bypassing an inrush current limiting resistor. The power conversion circuit (100) may comprise: a bridge rectifier; at least one current limiting resistor (R ICL ; R1, R2) coupled to the bridge rectifier and an electrical ground (25); at least one controllable current switching device (72; 201, 202) coupled to the current limiting resistor (R ICL ; R1, R2); and at least one driver coupled (74; 74A, 74B) coupled to the current limiting resistor (R ICL ; R1, R2) and the controllable current switching device (72; 201, 202), the at least one driver (74; 74A, 74B) configured to control an operation of the at least one current switching device (72; 201, 202) based on a current or a voltage through the current limiting resistor (R ICL ; R1, R2).
摘要:
The method for controlling an angular position of a MEMS mirror includes: applying a first driving moment to the MEMS mirror to generate a rotational scanning movement of the mirror; and, at a zooming instant, applying a second driving moment to the MEMS mirror, wherein the second driving moment is equal to the first driving moment plus an extra moment. The extra moment may be a DC offset. After a transient period of time from zooming instant, a third driving moment M 2 = k θ̇ 2 t is applied. The first and third driving moment are variable linearly with time. The driving moments are applied to torsional springs of the mirror.
摘要:
A semiconductor integrated circuit for processing a plurality of received broadcast signals, such as GPS signals, is operable in two modes; acquisition and tracking. In an acquisition mode, a memory arrangement comprising two circulating shift registers circulates samples of a received signal for correlation with a locally generated version of a GPS code. In a tracking mode, the sampled signal is provided direct to the correlators. The same correlators are thereby used to increase acquisition speed.
摘要:
The chip has a CPU (12), memories (13, 14) for programs and data, peripheral units (18, 19) for interacting with the outside world, and an internal RC oscillator (17) for providing clock signals. One of the peripheral units (18) has a timer counter incremented at a frequency derived from the RC oscillator. The method does not try to change the frequency of the RC oscillator. Instead, an external calibration source (21) is connected to a capture input of the timer unit to provide a signal having a reference frequency, e.g. the mains frequency. The counter is sampled on active edges of that signal, and the sampled values are processed to derive a calibration ratio. After these calibration steps, a software correction is applied to parameters handled by programs stored in memory based on the calibration ratio to compensate for frequency variations of the RC oscillator.
摘要:
Compression circuitry for generating an encoded bitstream from a plurality of video frames. Data is DCT transformed and then streamed to a processor where quantised and inverse quantised blocks are generated. A second streaming data connection streams the inverse quantised blocks to an inverse DCT block to generate reconstructed prediction error macroblocks. An addition circuit adds each reconstructed prediction error macroblock and its corresponding predictor macroblock to generate a respective reconstructed macroblock. The quantised macroblocks are zig-zag scanned, run level coded and variable length coded to generate an encoded bitstream.
摘要:
An integrated cache memory circuit is provided comprising a tag RAM, a comparator and a data RAM. Each of the tag RAM and the date RAM have an array of memory cells and plural sense amplifiers. Each memory cell of the RAMs is connected via a respective bit line to one of the plural sense amplifiers. The sense amplifiers of the tag RAM have respective outputs coupled to a first input of the comparator. The comparator having a second input for address information and an output for selectively enabling data output from sense amplifiers of the data RAM. The memory cells of the tag RAM are arranged to have a higher current drive than the memory cells of the data RAM.
摘要:
The invention provides circuitry for carrying out a square root operation and a division operation. The circuitry comprises common iteration circuitry for carrying out a plurality of iterations and means for identifying if an square root operation or a division operation is to be performed. The iteration circuitry is controlled in accordance with whether a square root or division operation is to be performed.