摘要:
An optical fiber connector and method for assembly and use are disclosed. The optical fiber connector is configured to have a small footprint so that the connector may be pushable or pullable through a conduit if use of a conduit may be needed. The connector may include a first number of connector components configured to fit through a conduit, and a second number of connector components that are configured to be installed to the first components, for example, after the connector is pushed or pulled through a conduit.
摘要:
An integrated data jitter generator for the testing of high speed serial interfaces is provided. A transmit timing generator for use in a transmit data path includes a high frequency clock generator such as a phase-locked loop or a delay-locked loop having an input for receiving an oscillator or reference clock input. A clock modulator receives both an existing low frequency modulation signal and a high frequency modulation signal. A high-speed modulated clock signal is generated to enable jitter testing by a downstream-coupled receiver. Fixed frequencies such as 3, 6, 125, 150, 250, 300, 750, or 1500 MHz are used for the high-speed modulation signal, but any high-speed modulation frequency can be used to generate the desired amount of jitter. Likewise, the amplitude of the high frequency modulation signal can also be varied as desired.
摘要:
Polysilicon dendrites are grown by depositing silicon on a polysilicon rod or other substrate. Surface temperature is increased to a temperature at which needle-like dendrites develop due to the deposition of silicon from silicon-containing molecules in the surrounding reactor atmosphere. Thereafter, the surface temperature is gradually reduced so that silicon that deposits on the needle-like dendrites causes the dendrites to grow and assume a generally flared shape.
摘要:
A VCM power driver having an input for receiving an external supply voltage VDD. A voltage-mode driver is coupled to the power supply voltage and generates a drive signal to a load. A system processor generates commands indicating a programmed voltage output desired from the voltage-mode driver. A comparator compares VDD to a reference voltage to generate an error signal. A combination mechanism generates a modified command using the error signal. The modified commands are coupled to the voltage-mode driver, such that the voltage-mode driver generates a voltage output based upon the modified command.
摘要:
The invention provides a high-speed interface that transfers servo position data from the read channel integrated circuit to the drive control integrated circuit or another integrated circuit. The high-speed interface eliminates the need for analog pins on the integrated circuits to lower the cost of the system. The high-speed interface also eliminates the use of the serial interface to transfer the servo position data which speeds up the data transfer. Examples of servo position data include high-resolution servo position data and coarse-resolution servo position data. A read channel integrated circuit transfers the user data and the high-resolution servo position data to a data bus, such as an NRZ bus. The data bus transfers the user data and the high-resolution servo position data to another integrated circuit, such as a drive control integrated circuit. The other integrated circuit receives the user data and the high-resolution servo position data from the data bus. The coarse-resolution servo position data can also be transferred over the data bus.
摘要:
The present invention teaches a system for selectably oscillating at a first or a second oscillating frequency. The system comprises an oscillator for providing an oscillating output. Moreover, the system comprises a switching device for selecting a first or a second impedance in response to a select signal having a voltage. Each of the first and second impedances is fixed independently of the select signal voltage such that the oscillating output oscillates at the first oscillating frequency when the first impedance is provided and oscillates at the second oscillating frequency when the second impedance is provided.
摘要:
Disclosed is a tracking control integrated circuit (IC) system implementation and method for controlling the gain of a digital-to-analog converter in a disk drive system. The tracking control IC system includes components defined in integrated circuit chips and components defined on a printed circuit board. The tracking control IC system is configured to be implemented in a disk drive system that includes a disk media. The tracking control IC system includes a servo controller chip that includes a compensator/processor, the digital-to-analog converter, and a switch. The switch is configured to receive a high gain signal (being Low or High) for setting the switch in an open state or a closed state. The tracking control IC system further includes a power amplifier chip having amplifying elements. The power amplifier chip has a first input and a second input, both of which connect to selected ones of the amplifying elements. The digital-to-analog converter includes a first output that is in communication with the switch and the first input of the power amplifier chip. The digital-to-analog converter has a second output that is in communication with the switch, and the switch has an output that is coupled to the first input of the power amplifier chip through the selected amplifying elements. The switch therefore enables the tracking control IC system to have a wider dynamic range control voltage Vc without increasing the die area of the servo control chip, without adding external active components to the PCB, and without increasing the control signal's susceptibility to noise pickup or offsets.
摘要:
An analog data acquisition system in an integrated circuit automatically processes and stores analog data without sequencing support from a processor. The analog data acquisition system converts each analog input signal into digital data. The digital data are stored in registers in the integrated circuit that are directly readable by a digital signal processor without data moves and are directly usable by the digital signal processor without further processing or conversion. Consequently, the analog data acquisition system minimizes the use of both the digital signal processor and the digital signal processor program memory and leaves capacity, i.e., both processing time and instruction memory locations, for use in other activities. The analog data acquisition system includes an analog input multiplexer and an analog-to-digital (A/D) converter that has an input line that is connected to the analog input multiplexer output line. An acquisition sequencer provides signals to the analog input multiplexer so that a signal on one of the plurality of input lines to the analog input multiplexer is applied to the A/D converter.
摘要:
A disk drive controller integrated circuit includes a programmable servo burst decoder that can process any one of a plurality of servo sectors. A disk drive head reads each embedded servo sector on the disk and provides an analog signal, a servo burst, representing the servo sector to a preamp. The preamp provides an amplified analog signal to a read channel integrated circuit. The read channel integrated circuit provides input signals that are processed by the programmable servo burst decoder. The programmable servo burst decoder includes a programmable timing mark sequencer having an instruction register of a first size and a servo timing mark output line, and a programmable burst sequencer connected to the servo timing mark output line and having an instruction register of a second size. In this embodiment, the first size is different from the second size. Specifically, the first size is 20 bits, and the second size is 38 bits.
摘要:
The present invention teaches an oscillator and transmitter. The balanced oscillator comprises a resonator for generating a reference signal having a resonating frequency, a first oscillator for providing a first oscillating output in response to the resonating frequency, and a second oscillator for providing a second oscillating output in response to the resonating frequency. The second oscillating output has a magnitude equal to the first oscillating output while oscillating 180 degrees out of phase with the first oscillating output. The transmitter comprises an antenna for radiating the first and second oscillating output signals.