Abstract:
In an HDMI system, the clock regenerator proposed by the HDMI specification may suffer external noise because the input clock of a phase lock loop circuit in a sink device of the HDMI system is too slow. This slow input clock causes the phase lock loop circuit unable to adjust and reduce the jitter of an audio clock regenerated in the sink device. Therefore, one embodiment of the present invention provides a clock regenerator to extract the relationship between the regenerated audio clock and a video clock received by the sink device from other source devices. The clock regenerator may comprise a phase lock loop circuit, a recovery circuit, a crystal oscillator and a tracking circuit. The crystal oscillator generates a crystal clock. The phase lock loop circuit receives the crystal clock and regenerates an audio clock. The recovery circuit extracts the relationship between the audio clock and the received video clock. The tracking circuit tunes the frequency of the crystal clock based on the extracted relationship.
Abstract:
A reference voltage generator is provided. The reference voltage generator includes a bandgap reference circuit, a level shifter and a voltage divider. The bandgap reference circuit includes a current generator and a first BJT. The current generator outputs a reference current. The first BJT flows in the reference current from its emitter via a first resistor and has its collector and base grounded, such that a bandgap reference voltage and a first bias voltage can be output at the connection between the current generator and the first resistor and at the emitter of the first BJT. The level shifter is coupled to the bandgap reference circuit and outputs a second bias voltage higher than the first bias voltage and unequal to the bandgap reference voltage. The voltage divider is connected between the second bias voltage and the bandgap reference voltage and outputs a reference voltage therebetween.
Abstract:
A data communication system comprises a transmitter and a receiver. A plurality of current mode drivers at the transmitter are used to transmit clock and data signals to the receiver. A plurality of current mode sinks at the receiver are used to receive the transmitted clock and data signal. The present invention provides an improved current mode interface receiver with a process insensitive common mode current extraction circuit. The proposed common mode current extraction circuit will generate a current reference based on the received clock signal, so as to accurately interpret the received clock and data signals.
Abstract:
The present invention provides a Cinnamomum subavenium extract for inhibiting melanogenesis. The present invention also provides a composition for inhibiting melanogenesis including compounds inhibit tyrosinase activity.
Abstract:
It is difficult to implement a conventional phase lock loop circuit in a sink device within an HDMI system because the low frequency input causes the conventional phase lock loop circuit to absorb unnecessary noise during a long waiting period. Therefore, the present invention provides a low jitter clock regenerator comprises: an input clock; a divider to divide said input clock into a slower clock; a phase lock loop circuit to regenerate said slower clock to a reference clock; and a parameter transformer to tune said divider and said phase lock loop circuit to increase the adjustment speed of said phase lock loop circuit. The present invention also provides a method to reorganize parameters in order to create new parameters which are better suitable for a clock recovery circuit in a sink device within an HDMI system.
Abstract:
A digital-to-analog converter outputting an output analog voltage according to an N-bit digital signal is provided. The digital-to-analog converter includes a first and a second resistor strings, a first and a second select units. The first resistor string is connected between a first and a second power supply voltages to generate a first group of reference voltages. The first select unit selects two reference voltages out of the first group according to M most significant bits of the N-bit digital signal. The second resistor string is connected between the selected reference voltages to generate a second group of reference voltages between the selected reference voltages. The second select unit selects one reference voltage out of the second group as the output analog voltage according to the N-M least significant bits of the N-bit digital signal.
Abstract:
A data communication system comprises a transmitter and a receiver. A plurality of current mode drivers at the transmitter are used to transmit clock and data signals to the receiver. A plurality of current mode sinks at the receiver are used to receive the transmitted clock and data signal. The present invention provides an improved current mode interface receiver with a process insensitive common mode current extraction circuit. The proposed common mode current extraction circuit will generate a current reference based on the received clock signal, so as to accurately interpret the received clock and data signals.
Abstract:
A method pixel driving method of an organic light emitting diode (OLED) display and an apparatus thereof are provided. The method comprises the following steps. First, a pixel unit is reset to a predetermined voltage in a reset time period. After that, a frame period is divided into two driving time periods so that the pixel unit is finally charged to a pixel voltage. The charging process of the pixel unit is that the pixel unit is charged to a ground level in a first driving time period, and then the pixel unit is charged to the pixel voltage in a second driving time period.
Abstract:
A collapsible container includes a rectangular bottom, a front and a rear rectangular wall pivotally turnably connected to a front and a rear edge, respectively, of the bottom along two folding lines, two rectangular side walls pivotally turnably connected to two lateral ends of each of the front and the rear wall along two folding lines, and two locating flaps pivotally turnably connected to two lateral edges of the bottom along two folding lines. Each of the two locating flaps is an isosceles triangle having two equal lateral sides separately corresponding to a diagonal of the side wall. Moreover, fastening elements are correspondingly provided on an inner surface of each side wall and an outer surface of the locating flap to enable detachable connection of the side walls to the locating flaps and accordingly free collapse and extension of the container.
Abstract:
Disclosed are a device and method therefor for ENOB (effective number of bits) estimation for an ADC (analog-to-digital converter) based on dynamic deviation, wherein the correlation between dynamic deviation and ENOB is analyzed so as to provide a novel device and method therefor to estimate and calculate ENOB for an ADC. Dynamic deviation, provided in the present invention, can serve as a novel parameter for use in evaluation of the performance of an ADC. The present invention further provides a model related to the relation of distribution of dynamic deviation and input frequency, wherein ENOB can be therefore predicted for higher input frequency for an ADC without a high-quality signal generator by measuring dynamic deviation for lower input frequency.