Abstract: A phase-locked loop (PLL) including an active filter, a voltage-controlled oscillator (VCO), two phase detectors, a charge pump and a digital-to-analog converter (DAC) is provided. The VCO generates an oscillation signal according to a control signal provided at an output of the active filter. The first phase detector generates a phase difference signal according to a reference signal and a feedback signal associating with the oscillation signal. The charge pump provides a charging current to a first input of the active filter according to the phase difference. The second phase detector generates a digital reference signal according to the phase difference between the reference signal and the feedback signal. The DAC converts the digital reference signal to an analog reference voltage and provides the analog reference voltage to the second input of the active filter.

Abstract: A stereoscopic camera module includes two lens modules, a light guide assembly, an image sensor, and a processor. Each lens module includes a shutter and at least one lens. The light guide assembly includes two inlets and an outlet, the two inlets are hermetically sealed by the two lens modules. External light rays enter into the two inlets from the two lens modules respectively and project from the outlet. The image sensor is position at the outlet of the light guide assembly and configured for capturing images. The processor is configured for controlling the shutters to open in quick succession and composing a left image and a right image alternately captured by the image sensor to a stereoscopic image.

Abstract: A stereoscopic imaging device includes two lens modules, two light guiding tubes, a reflection element, a motor, an image sensor, and a controller. Each light guiding tube includes a light incident end connected to a corresponding lens module and a light emitting end. The two light emitting ends of the light guiding tubes face to each other. The reflection element is positioned between the two light emitting ends. The image sensor faces the reflection element. The motor is connected to the reflection element. The controller is electrically connected to the image sensor and the motor. The controller is used for controlling the motor to drive the reflection element to rotate, thus to make the reflection element reflect the light from the two first guiding tubes to the image sensor in turn.

Abstract: A 3D image capturing device includes a first lens module, a second lens module, a single sensor, an image sensor; a cross dichroic prism; a first mirror; and a second mirror. The first and second lens module have a first optical axis and a second optical axis, respectively. The second lens module is located juxtaposed with the first lens module. The second optical axis is parallel with the first optical axis. The first and second mirrors are arranged at opposite sides of the cross dichroic prism. The first and second mirrors are configured for reflecting and directing light beams from the first and second lens modules to the cross dichroic prism. The cross dichroic prism is configured to redirect the reflected light beams from the first and second mirrors to the image sensor.

Abstract: A lens module includes a lens and a lens barrel receiving the lens therein with a gap maintained between a peripheral surface of the lens and an inner surface of the lens barrel. The lens barrel includes a plurality of hole portions with through holes defined therein and facing the peripheral surface of the lens, and a glue applied in the gap to adhere the lens to the hole portions.

Abstract: A clock generating circuit includes a phase detector for detecting a phase difference between a first clock and a second clock to generate a detecting result associated with the phase difference, a first filtering device for filtering the detecting result, a charge pump for generating a control signal according to the filtered detecting result, a second filtering device for filtering the control signal, and a controllable oscillator for generating an output clock according to the filtered control signal, wherein the output clock is utilized to generate the second clock.

Abstract: A mold for fabricating an optical fiber connector is provided. The mold includes a mold body, a core pin and a positioning block. The mold body defines a molding chamber, and the molding chamber has a lens forming portion for forming a lens. The core pin is configured for insertion into the molding chamber and forming an optical fiber insertion hole. The core pin includes a first portion and a second portion thinner than the first portion. The positioning block is configured for being arranged in the molding chamber. The positioning block includes an engaging hole for engagingly receiving the second portion.

Abstract: A dual-lens image capture device includes an optical conversion module, a first image sensor, a second imager sensor, a first lens, and a second lens. The optical conversion module includes an infrared light filter, a collimator, and a spectroscope. The infrared light filter filters infrared light of light from a light source and allows visible light from the light source to pass through. The collimator converts the visible light into parallel beams. The spectroscope is placed at one side of the collimator away from the infrared light filter, and reflects a portion of the parallel beams and allows remaining parallel beams to pass through. The first lens receives the reflected parallel beams, and focusing the beams onto the first image sensor. The second lens receives the passed parallel beams, and focusing the beams onto the second image sensor.

Abstract: A camera module includes a lens barrel, a first lens and a second lens. The lens barrel includes a substantially cylindrical inner wall. The first lens is received in the lens barrel. The first lens includes a first circumferential side surface spaced from the inner wall. The second lens is engaged with the first lens and received in the lens barrel. The second lens includes a second circumferential side surface. The second circumferential side surface has a first portion contacting the inner wall and a second portion spaced from the inner wall, thus a gap defined between the second portion and the inner wall. Adhesive is applied in the gap between the second portion and the inner wall.

Abstract: An exemplary lens module includes a lens barrel, a first lens, and a second lens. The lens barrel includes an accommodating cavity defined therein. The first lens is received in the accommodating cavity of the lens barrel. The first lens has a first adjusting notch defined at a periphery thereof. The second lens is received in the accommodating cavity of the lens barrel and adjacent to the first lens. The second lens has a second adjusting notch defined at a periphery thereof. The second adjusting notch communicates with the first adjusting notch.

Abstract: An apparatus for determining signal power comprise an oscillating circuit and a determining circuit. The oscillating circuit generates an oscillating signal. When a to-be-detected signal has signal power greater than a threshold, the oscillating signal has a first frequency; when the signal power is smaller than the threshold, the oscillating signal has a second frequency. The determining circuit determines whether the oscillating signal has either the first frequency or the second frequency, and generates a determination result accordingly.

Abstract: A camera module includes a lens barrel, a first lens and a second lens. The lens barrel includes a substantially cylindrical inner wall. The first lens is received in the lens barrel. The first lens includes a first circumferential side surface spaced from the inner wall. The second lens is engaged with the first lens and received in the lens barrel. The second lens includes a second circumferential side surface. The second circumferential side surface has a first portion contacting the inner wall and a second portion spaced from the inner wall, thus a gap defined between the second portion and the inner wall. Adhesive is applied in the gap between the second portion and the inner wall.

Abstract: An offset phase-locked loop (PLL) transmitter comprises a clock generator that generates a first clock signal; a detector that detects a phase difference between an input data signal and a feedback data signal to generate a control signal; a controlled oscillator, coupled to the detector, that generates an output data signal according to the control signal; a mixer, coupled to the controlled oscillator and the clock generator, that mixes the output data signal according to the first clock signal to generate the feedback data signal; and a control circuit, coupled to the detector and the controlled oscillator, that adjusts the operating frequency curve of the controlled oscillator by one of a first step distance and a second step distance smaller than the first step distance such that the control signal is substantially equal to a predetermined value.

Abstract: A loop bandwidth control apparatus applied to a phase locked loop (PLL) includes a first loop filter module, a second loop filter module, a control module, a first switching module, and a second switching module. The first filter module and the second loop filter module output a first voltage and a second voltage, respectively. The second loop filter module has a bandwidth different from that of the first loop filter module. According to one of the first voltage and the second voltage, the control module generates a bandwidth control signal. According to the bandwidth control signal, the first switching module forms a path between a charge pump and one of the first loop filter module and the second loop filter module, and the second switching module forms a path between a voltage-controlled oscillator (VCO) and one of the first loop filter module and the second loop filter module.

Abstract: A phase locked loop (PLL) includes a clock generating circuit, a first phase detecting circuit, a first loop filter, a first VCO, a first mixer and a control circuit. The clock generating circuit generates a first clock signal. The first phase detecting circuit detects a phase difference between an input data signal and a feedback signal and generates a detection output signal according to the phase difference. The first loop filter, coupled to the first phase detecting circuit, generates a first VCO control signal according to the detection output signal. The first mixer, coupled to the first VCO and the clock generating circuit, mixes the output data signal and the first clock signal to generate the feedback data signal. The control circuit, coupled to the clock generating circuit and the first loop filter, for adjusting the first clock signal according to the first VCO control signal to calculate a gain of the first VCO.

Abstract: A lens arrangement includes two lenses. Each lens includes an imaging portion having an optical axis, a non-imaging portion surrounding the imaging portion, and an annular engagement portion extending outwards from the non-imaging portion along the optical axis. The engagement portions are interferentially engaged with each other. The diameter difference of the engagement portion is greatly smaller than the dimension of the lens to ensure that the engagement portions efficiently and sufficiently deforms while the deformation of the engagement portion is not transmitted to the imaging portion.

Abstract: A lens module used in a portable electronic device, including a barrel with two ends, and a first lens and a second lens received in the barrel. A third lens is positioned proximal to one end of the barrel, which has a fastening member and an engaging member, wherein the engaging member is accommodated with the fastening member to compactly couple the third lens with the end of the barrel. The third lens is fastened on the one end of the barrel to reduce the overall volume of the lens module.

Abstract: A loop bandwidth control apparatus applied to a phase locked loop (PLL) includes a first loop filter module, a second loop filter module, a control module, a first switching module, and a second switching module. The first filter module and the second loop filter module output a first voltage and a second voltage, respectively. The second loop filter module has a bandwidth different from that of the first loop filter module. According to one of the first voltage and the second voltage, the control module generates a bandwidth control signal. According to the bandwidth control signal, the first switching module forms a path between a charge pump and one of the first loop filter module and the second loop filter module, and the second switching module forms a path between a voltage-controlled oscillator (VCO) and one of the first loop filter module and the second loop filter module.

Abstract: A voltage-controlled oscillator (VCO) control circuit, used for controlling a VCO to process phase locking procedure after receiving a frequency locking signal, comprises an operating frequency controller and a judgment unit. The operating frequency controller, coupled to the VCO and the judgment unit, generates one of a first control code and a second control code to the VCO. The judgment unit, coupled to an input end of the VCO, generates a phase locking signal according to a voltage control signal inputted to the VCO. When the operating frequency controller receives the frequency locking signal, the operating frequency controller generates a first control code to control the VCO to switch from a first candidate VCO curve to a second candidate VCO curve. When the operating frequency controller receives the phase locking signal, the operating frequency controller generates a second control code to control the VCO to switch from the second candidate VCO curve to the first candidate VCO curve.

Abstract: A frequency calibration apparatus, applied to a phase locked loop (PLL), includes a frequency detecting module and a search module. The frequency detecting module includes a first counter, a second counter and a comparing unit. During a monitoring period, the first counter and the second counter respectively generates a first count and a second count. The comparing unit compares the first count with the second count to generate a comparison result indicating at least three situations. The search module selects a frequency curve in response to the comparison result, and calibrates configuration of a voltage controlled oscillator (VCO) according to the frequency curve.