Patent application number | Description | Published |
20090146696 | CLASS-AB DRIVER DESIGN WITH IMPROVED FREQUENCY RESPONSE - A class-AB driver design with improved frequency response is disclosed. In one embodiment, the class-AB driver includes a push-pull output stage, a trans-linear loop, an input stage, a current biasing and enabling circuit. Further, the trans-linear loop is coupled to a signal input terminal AB | 06-11-2009 |
20090184766 | LOW-VOLTAGE WIDE-RANGE LINEAR TRANSCONDUCTOR CELL - An improved low-voltage, low-power, wide range, and linear Gm Cell is disclosed. In one embodiment, a method of linearizing output current with an input voltage using a Gm Cell includes receiving an input differential voltage by an emitter degenerated input stage and outputting a current including a linear part and a nonlinear part at signal output terminals Iout_P and Iout_M, converting the non-linear part of the output current to a voltage difference via a compression stage, converting the voltage difference to a linear output current by a linear voltage to current converter stage, outputting the linear output current using a current mirror output stage to the signal output terminals Iout_P and Iout_M, and summing the output currents of the emitter degenerated input stage and the current mirror output stage at the signal output terminals Iout_P and Iout_M to obtain a linear output current with the input differential voltage. | 07-23-2009 |
20100166031 | LASER DIODE DRIVER ARCHITECTURES - Laser diode driver architectures are disclosed. Some example current drivers are described, including a current channel to provide an output current. The current channel includes a current mirror with emitter degeneration, a startup transistor coupled to the current mirror to generate a DC bias on the current mirror, a beta helper circuit coupled to the current mirror and the startup transistor, to maintain the DC bias on the current mirror, and a cutoff transistor coupled to an emitter terminal of a current mirror transistor and to a reference voltage, to selectively couple the emitter terminal to the reference voltage to conduct the pre-determined output current. The example current drivers also include an output stage coupled to the output of the current mirror and to an output device, wherein the output stage provides a current gain in response to the cutoff transistor coupling the emitter terminal to the reference voltage. | 07-01-2010 |
20100315915 | Input Signal Processing System - An input signal processing system is described. It comprises a first transconductance device having a first input, second input, and an output, wherein the first input is coupled to receive the input signal; a first resistor coupled to a first input of the first transconductance device, wherein the first resistor converts the input current signal to an input voltage signal; a first voltage-current converter coupled to the output, the second input, the resistor, and a low voltage supply, wherein the first voltage-current converter is operative for converting the input voltage signal to a input current signal; and a low pass filter having an input coupled to the voltage converter for filtering noise from the input current signal. | 12-16-2010 |
20100315917 | INPUT CURRENT CHANNEL DEVICE - An input current channel device is described. This device comprises a first terminal for receiving a reference signal; a second terminal for receiving a first target signal; a pass through device coupled to the first terminal, the pass through device operative for transmitting a delayed reference signal in response to receiving the reference signal; a first combination logic device coupled to the first terminal and the second terminal, the first combination logic device operative for transmitting a first combination logic signal in response to receiving the reference signal and the first target signal; a selection device coupled for receiving the delayed reference signal, the first combination logic signal, and a first synchronization signal, the selection device operative for selectively transmitting a second synchronization signal, and wherein selectively transmitting the second synchronization signal reduces skew between the reference channel and the first target channel. | 12-16-2010 |
20100315918 | LASER DIODE DRIVER WITH WAVE-SHAPE CONTROL - An optical disk drive system associated with a laser diode is described. The optical disk drive system comprises a current generator for receiving input signals; a current switch coupled to receive timing signals; a current driver coupled to receive output signals from the current switch and the current generator, the current driver further comprising a driver with wave shape control selected from the group consisting of a laser diode read driver and a laser diode write driver, wherein the driver with shape control is operative for transmitting at least one output signal that is a scaled version of at least one of the output signals received from the current generator, wherein the current driver is operative for transmitting at least one output signal driving the laser diode. | 12-16-2010 |
20120300606 | Current Driver Damping Circuit - Various apparatuses, methods and systems for damping a current driver are disclosed herein. For example, some embodiments provide an apparatus for supplying current, including an output transistor connected between a voltage supply and a current output, and an active clamp connected between the current output and a current sink. The active clamp is adapted to connect the current output to the current sink when a voltage at the current output reaches a predetermined state relative to a voltage at a control input of the output transistor. | 11-29-2012 |
20130121357 | LASER DIODE WITH WAVE-SHAPE CONTROL - An optical disk drive system associated with a laser diode is described. The optical disk drive system comprises a current generator for receiving input signals; a current switch coupled to receive timing signals; a current driver coupled to receive output signals from the current switch and the current generator, the current driver further comprising a driver with wave shape control selected from the group consisting of a laser diode read driver and a laser diode write driver, wherein the driver with shape control is operative for transmitting at least one output signal that is a scaled version of at least one of the output signals received from the current generator, wherein the current driver is operative for transmitting at least one output signal driving the laser diode. | 05-16-2013 |
20130329759 | LASER DIODE DRIVER WITH WAVE-SHAPE CONTROL - An optical disk drive system associated with a laser diode is described. The optical disk drive system comprises a current generator for receiving input signals; a current switch coupled to receive timing signals; a current driver coupled to receive output signals from the current switch and the current generator, the current driver further comprising a driver with wave shape control selected from the group consisting of a laser diode read driver and a laser diode write driver, wherein the driver with shape control is operative for transmitting at least one output signal that is a scaled version of at least one of the output signals received from the current generator, wherein the current driver is operative for transmitting at least one output signal driving the laser diode. | 12-12-2013 |