Abstract: A system to control convergence of a loop to a reference value. A device, under control of the control loop, generates an output signal. A comparator compares the output signal to a reference value. Responsive to the output signal being less than the reference value, outputting an up signal and, responsive to the output signal being greater than the reference value, outputting a down signal. A counter is configured to maintain a counter value which is incremented in response to an up signal and decremented in response to a down signal. The counter outputs a gain control value. An up/down signal tracker is configured to track a pattern of up signals and down signals and compare the tracked pattern to one or more predetermined patterns such that, responsive to the up signals and down signals matching one of the one or more predetermined patterns, the counter size is decreased.

Abstract: A system and method for controlling optical receiver operation in response to a received optic signal power level that includes providing an optic signal receiver having operation determined by one or more system settings. During operation, the optic signal is received and converted to an electrical signal. The electrical signal is evaluated to determine a power level of the electrical signal. Responsive to the power level of the electrical signal exceeding a first predetermined threshold, adjusting a first system setting and responsive to the power level of the received electrical signal decreasing below a second predetermined threshold, adjusting the first system setting. Then, responsive to the power level of the received electrical signal exceeding a third predetermined threshold, adjusting a second system setting and responsive to the power level of the received electrical signal decreasing below a fourth predetermined threshold, adjusting the second system setting.

Abstract: A transimpedance amplifier and photodiode that has a bias voltage node established at a bias voltage and a ground node/plane that connects, over a short distance as compared to the prior art, to a photodiode and a transimpedance amplifier. The photodiode is in a substrate and configured to receive and convert an optical signal to an electrical current. The photodiode has an anode terminal and a cathode terminal which is connected to the bias voltage node. One or more capacitors in or on the substrate and connected between the bias node and the ground node. The transimpedance amplifier has an input connected to the anode terminal of the photodiode and an output that presents a voltage representing the optical signal to an output path. The transimpedance amplifier and the photodiode are both electrically connected in a flip chip configuration and the ground plane creates a coplanar waveguide.

Abstract: A system and method for controlling optical receiver operation in response to a received optic signal power level that includes providing an optic signal receiver having operation determined by one or more system settings. During operation, the optic signal is received and converted to an electrical signal. The electrical signal is evaluated to determine a power level of the electrical signal. Responsive to the power level of the electrical signal exceeding a first predetermined threshold, adjusting a first system setting and responsive to the power level of the received electrical signal decreasing below a second predetermined threshold, adjusting the first system setting. Then, responsive to the power level of the received electrical signal exceeding a third predetermined threshold, adjusting a second system setting and responsive to the power level of the received electrical signal decreasing below a fourth predetermined threshold, adjusting the second system setting.

Abstract: A system to control convergence of a loop to a reference value. A device, under control of the control loop, generates an output signal. A comparator compares the output signal to a reference value. Responsive to the output signal being less than the reference value, outputting an up signal and, responsive to the output signal being greater than the reference value, outputting a down signal. A counter is configured to maintain a counter value which is incremented in response to an up signal and decremented in response to a down signal. The counter outputs a gain control value. An up/down signal tracker is configured to track a pattern of up signals and down signals and compare the tracked pattern to one or more predetermined patterns such that, responsive to the up signals and down signals matching one of the one or more predetermined patterns, the counter size is decreased.

Abstract: A system and method for controlling optical receiver operation in response to a received optic signal power level that includes providing an optic signal receiver having operation determined by one or more system settings. During operation, the optic signal is received and converted to an electrical signal. The electrical signal is evaluated to determine a power level of the electrical signal. Responsive to the power level of the electrical signal exceeding a first predetermined threshold, adjusting a first system setting and responsive to the power level of the received electrical signal decreasing below a second predetermined threshold, adjusting the first system setting. Then, responsive to the power level of the received electrical signal exceeding a third predetermined threshold, adjusting a second system setting and responsive to the power level of the received electrical signal decreasing below a fourth predetermined threshold, adjusting the second system setting.

Abstract: A system and method for controlling optical receiver operation in response to a received optic signal power level that includes providing an optic signal receiver having operation determined by one or more system settings. During operation, the optic signal is received and converted to an electrical signal. The electrical signal is evaluated to determine a power level of the electrical signal. Responsive to the power level of the electrical signal exceeding a first predetermined threshold, adjusting a first system setting and responsive to the power level of the received electrical signal decreasing below a second predetermined threshold, adjusting the first system setting. Then, responsive to the power level of the received electrical signal exceeding a third predetermined threshold, adjusting a second system setting and responsive to the power level of the received electrical signal decreasing below a fourth predetermined threshold, adjusting the second system setting.

Abstract: A transimpedance amplifier and photodiode that has a bias voltage node established at a bias voltage and a ground node/plane that connects, over a short distance as compared to the prior art, to a photodiode and a transimpedance amplifier. The photodiode is in a substrate and configured to receive and convert an optical signal to an electrical current. The photodiode has an anode terminal and a cathode terminal which is connected to the bias voltage node. One or more capacitors in or on the substrate and connected between the bias node and the ground node. The transimpedance amplifier has an input connected to the anode terminal of the photodiode and an output that presents a voltage representing the optical signal to an output path. The transimpedance amplifier and the photodiode are both electrically connected in a flip chip configuration and the ground plane creates a coplanar waveguide.

Abstract: A transimpedance amplifier and photodiode that has a bias voltage node established at a bias voltage and a ground node/plane that connects, over a short distance as compared to the prior art, to a photodiode and a transimpedance amplifier. The photodiode is in a substrate and configured to receive and convert an optical signal to an electrical current. The photodiode has an anode terminal and a cathode terminal which is connected to the bias voltage node. One or more capacitors in or on the substrate and connected between the bias node and the ground node. The transimpedance amplifier has an input connected to the anode terminal of the photodiode and an output that presents a voltage representing the optical signal to an output path. The transimpedance amplifier and the photodiode are both electrically connected in a flip chip configuration and the ground plane creates a coplanar waveguide.

Abstract: A transimpedance amplifier and photodiode that has a bias voltage node established at a bias voltage and a ground node/plane that connects, over a short distance as compared to the prior art, to a photodiode and a transimpedance amplifier. The photodiode is in a substrate and configured to receive and convert an optical signal to an electrical current. The photodiode has an anode terminal and a cathode terminal which is connected to the bias voltage node. One or more capacitors in or on the substrate and connected between the bias node and the ground node. The transimpedance amplifier has an input connected to the anode terminal of the photodiode and an output that presents a voltage representing the optical signal to an output path. The transimpedance amplifier and the photodiode are both electrically connected in a flip chip configuration and the ground plane creates a coplanar waveguide.

Abstract: An optical transmitter driver is disclosed to drive a load with a drive signal responsive to a first and second input signal. The differential pair includes a first path having a first resistor connected to a first voltage supply and to a first transistor that receives the first input signal. A second path includes a second resistor connected to a second voltage supply and a second transistor. The first voltage supply is less than the second voltage supply. The second transistor has an input configured to receive the second input signal and the first and second input signals define a differential signal. Also part of this embodiment is a load connection node that presents the drive signal to the load. The first voltage supply is less than the second voltage supply. In one configuration cross coupled capacitor are connect between each input and the first path and second path.

Abstract: An optical transmitter driver is disclosed to drive a load with a drive signal responsive to a first and second input signal. The differential pair includes a first path having a first resistor connected to a first voltage supply and to a first transistor that receives the first input signal. A second path includes a second resistor connected to a second voltage supply and a second transistor. The first voltage supply is less than the second voltage supply. The second transistor has an input configured to receive the second input signal and the first and second input signals define a differential signal. Also part of this embodiment is a load connection node that presents the drive signal to the load. The first voltage supply is less than the second voltage supply. In one configuration cross coupled capacitor are connect between each input and the first path and second path.

Abstract: In accordance with the teachings described herein, an extended equalizer circuit is provided for equalizing a digital communication signal transmitted over a transmission medium that causes a frequency-dependent attenuation of the digital communication signal. An equalizer may be used that includes a linear equalization circuit and a non-linear equalization circuit, the linear equalization circuit being configured to apply a linear filter to the digital communication signal to compensate for the frequency-dependent attenuation caused by a first portion of the transmission medium, and the non-linear equalization circuit being configured to apply one or more non-linear operations to the digital communication signal.

Abstract: Systems and methods are provided for communicating a data signal. A data signal is transmitted along a communications line. The transmitted data signal is split among a plurality of routers, each router configured to receive the data signal and forward the data signal along one or more output data paths. The data signal is received at a destination, and flat-band amplification is provided to the received data signal via a selectable gain amplifier. A frequency dependent amplification is provided to the received data signal via an equalizer. The amplified received signal is then decoded.

Abstract: In accordance with the teachings described herein, a digital video cable driver is provided that includes an input stage, an output stage and an amplification stage. The input stage converts a pair of differential input voltages into a control current. The output stage generates a digital output voltage for transmission over a cable. The amplification stage responds to the control current to control a voltage swing of the digital output voltage as a function of the control current. The amplification stage may include a transistor circuit that varies the digital output voltage in proportion to variations in the control current to cause the voltage swing, wherein the control current causes one or more transistors in the transistor circuit to remain in a saturated state during operation of the digital video cable driver.

Abstract: In accordance with the teachings described herein, an extended equalizer circuit is provided for equalizing a digital communication signal transmitted over a transmission medium that causes a frequency-dependent attenuation of the digital communication signal. An equalizer may be used that includes a linear equalization circuit and a non-linear equalization circuit, the linear equalization circuit being configured to apply a linear filter to the digital communication signal to compensate for the frequency-dependent attenuation caused by a first portion of the transmission medium, and the non-linear equalization circuit being configured to apply one or more non-linear operations to the digital communication signal.

Abstract: Transmit amplitude independent adaptive equalizers are provided that compensate for transmission losses in an input signal when the transmit signal amplitude is unknown. Several embodiments are provided, including a first embodiment having an equalizer core, a controllable-swing slicer and an amplitude control loop, a second embodiment having an equalizer core, a fixed-swing slicer and a control loop, a third embodiment having an equalizer core, a variable gain amplifier, and a variable gain amplifier control loop, and a fourth embodiment having an equalizer core, a fixed-swing slicer, a variable gain amplifier, and a variable gain amplifier control loop.

Abstract: Transmit amplitude independent adaptive equalizers are provided that compensate for transmission losses in an input signal when the transmit signal amplitude is unknown. Several embodiments are provided, including a first embodiment having an equalizer core, a controllable-swing slicer and an amplitude control loop, a second embodiment having an equalizer core, a fixed-swing slicer and a control loop, a third embodiment having an equalizer core, a variable gain amplifier, and a variable gain amplifier control loop, and a fourth embodiment having an equalizer core, a fixed-swing slicer, a variable gain amplifier, and a variable gain amplifier control loop.

Abstract: A delay locked loop includes a triangle wave generator circuit coupled to a serial clock signal for generating a triangular wave signal. A phase interpolator coupled to the triangular wave signal and a weighting signal generates an interpolated clock phase signal, and a phase detector receives serial data and the interpolated clock phase signal and generates a retimed serial data signal.

Abstract: Transmit amplitude independent adaptive equalizers are provided that compensate for transmission losses in an input signal when the transmit signal amplitude is unknown. Several embodiments are provided, including a first embodiment having an equalizer core, a controllable-swing slicer and an amplitude control loop, a second embodiment having an equalizer core, a fixed-swing slicer and a control loop, a third embodiment having an equalizer core, a variable gain amplifier, and a variable gain amplifier control loop, and a fourth embodiment having an equalizer core, a fixed-swing slicer, a variable gain amplifier, and a variable gain amplifier control loop.