Abstract: Various techniques that can provide a capability to background calibrate ADC linearity error, e.g., due to capacitor mismatch drift and other parameter drift, during normal ADC operation in which analog-to-digital signal conversions are ongoing. A method can include grouping capacitors of an ADC into multiple clusters and calibrating under an arbitrary signal condition. To quickly converge the calibration result, the same arbitrary signal can be converted twice, and the capacitor(s) being calibrated can be modulated after first conversion. The difference between the results of the first and second conversions can contain the error information that can be used for calibration, and the signal component can be removed by this process. These techniques can provide improved linearity at 20-bit level and beyond.

Abstract: An analog-to-digital converter (ADC) circuit including error correction circuitry for correcting offset drifts in an ADC, such as a successive approximation register (SAR) ADC. The offset drifts can be reduced, such as by sampling the offset following an analog-to-digital conversion and subsequently providing an error correction signal based on the sampled offset.

Abstract: An analog to digital converter (ADC) system includes two signal paths in parallel with each other, where the signal paths include separate ADC circuits to separately operate on a same input signal and output separate digital signals. A difference signal is calculated as a difference of the digital signals output from the two signal paths to determine an error present in one or both of the signal paths. The error may be modulated in one or both of the signal paths and demodulated from the difference signal according to a same digital modulation pattern to compute an error compensation signal to compensate for at least one of the modulated error and a secondary error resulting from the modulation of the error.

Abstract: A Management-as-a-Service (MaaS) agent running on a client network creates a reverse session-origination (RSO) tunnel between the client network and a MaaS server. The MaaS agent collects client statistics at and regarding the client network and transmits the client statistics to the MaaS server. The MaaS server analyzes the client data and sends alerts or other messages to a user, who may be outside the client network, in the event certain conditions are met.

Abstract: A Management-as-a-Service (MaaS) agent running on a SOPS creates collecting management statistics relating to the health, utilization, and performance of a subscriber on-premises system (SOPS). The MaaS agent forwards the collected data to a MaaS server, which stores the data in association with a tenant identifier (TID) in a multi-tenant database. The MaaS server tags user queries with the TID, so that the query result is based on management data for the respective SOPS, to the exclusion of SOPS associated with different TIDs. The use of multi-tenant techniques with non-multi-tenant SOPS allows one MaaS to manage plural SOPS while maintaining isolation of the management data for the respective SOPS. In addition, the use of multi-tenant techniques allows SOPS to be managed together with cloud-based subscriber applications, facilitating common management of hybrid cloud and on-premises systems.

Abstract: An analog-to-digital converter (ADC) system can sample an input voltage for at least a first conversion into a first N1-bit digital value and to use the same input voltage sample for at least a second conversion into a second N2-bit digital value. A difference between a result of the first conversion and a result of the second conversion can be driven toward zero to adjust weights of one or more of the bits to calibrated values for use in one or more subsequent analog-to-digital conversions of subsequent samples of the input voltage. Shuffling, dithering, or the like can help ensure that at least a portion of the decision paths used in the second conversion are different from the decision paths used in the first conversion. Calibration can be performed in the background while the the ADC is converting in a normal mode of operation.

Abstract: A dynamically tunable transconductor includes a voltage-to-current converter stage for generating a current signal based on a voltage signal; and a current scaling stage for scaling the current signal by a scaling factor to achieve a particular transconductance. Current scaling stage includes a coarse tune mechanism having an associated coarse tune step and a fine tune mechanism having an associated fine tune step, where the scaling factor is a ratio of the coarse tune step to the fine tune step. A delta-sigma modulator can implement the transconductor to generate loop filter coefficients by dynamically tuning the transconductance to achieve a particular resistance.

Abstract: A dynamically tunable transconductor includes a voltage-to-current converter stage for generating a current signal based on a voltage signal; and a current scaling stage for scaling the current signal by a scaling factor to achieve a particular transconductance. Current scaling stage includes a coarse tune mechanism having an associated coarse tune step and a fine tune mechanism having an associated fine tune step, where the scaling factor is a ratio of the coarse tune step to the fine tune step. A delta-sigma modulator can implement the transconductor to generate loop filter coefficients by dynamically tuning the transconductance to achieve a particular resistance.

Abstract: A management system facilitating deployment of customizations of an enterprise application, with the enterprise application containing software modules pre-installed on a set of servers. In an embodiment, the management system first receives a set of deployment units each containing data defining a manner of configuration affecting the operation of at least some of the software modules to attain the desired customizations, and an enterprise profile indicating the specific subset of deployment units to be deployed in each of the servers. Management system then orchestrates the configuration of the software modules installed on the set of servers according to the data specified in the set of deployment units and the enterprise profile.

Abstract: An analog to digital convertor (ADC) comprises an integrator having an input selectively connected to an intermediate frequency (IF) signal input and an output connected to a summer. The summer has an output connected to an input of a quantizer, the quantizer output being operatively connected to a signal strength indicator. The integrator includes a programmable gain feedback component. The summer has a synthesized calibration signal input, the value of the programmable gain feedback component being configured to vary when a synthesized calibration signal at the intermediate frequency is applied to the summer. The signal strength indicator is configured to detect a value of the programmable gain feedback component when the signal strength is minimized and to calibrate the ADC accordingly.

Abstract: Apparatus and methods for voltage comparison are provided. In one embodiment, a comparator includes a first input transistor having a gate configured to receive a first input voltage and a second input transistor having a gate configured to receive a second input voltage. The first and second input transistors can be used to compare the first input voltage to the second input voltage. Additionally, the comparator further includes a first Miller capacitor electrically connected to a drain of the first input transistor and a second Miller capacitor electrically connected to a drain of the second input transistor. Furthermore, first and second inverting amplification circuits are electrically connected across the first and second Miller capacitors, respectively, so as to increase the effective capacitance of the capacitors. The first and second Miller capacitors can be used to extend the comparator's integration time, thereby enhancing the performance of the comparator.

Abstract: Apparatus and methods for voltage comparison are provided. In one embodiment, a comparator includes a first input transistor having a gate configured to receive a first input voltage and a second input transistor having a gate configured to receive a second input voltage. The first and second input transistors can be used to compare the first input voltage to the second input voltage. Additionally, the comparator further includes a first Miller capacitor electrically connected to a drain of the first input transistor and a second Miller capacitor electrically connected to a drain of the second input transistor. Furthermore, first and second inverting amplification circuits are electrically connected across the first and second Miller capacitors, respectively, so as to increase the effective capacitance of the capacitors. The first and second Miller capacitors can be used to extend the comparator's integration time, thereby enhancing the performance of the comparator.

Abstract: A voltage converter circuit can include a boost converter having a switching transistor and configured to receive an input voltage, produce an output voltage and selectively operate in one of a boost mode, a skip mode and a linear mode. In the boost and skip modes, the boost converter can switch on and off the switching transistor at a switching frequency to produce an output voltage at magnitudes greater than input voltage magnitudes. In the linear mode, the boost converter can turn off the switching transistor at all times to pass the input voltage unboosted to produce an output voltage at magnitudes less than input voltage magnitudes.

Abstract: In one aspect, a level shifter for shifting a voltage level from a first voltage level to a second voltage level and having a predictable power-up state is provided. The level shifter comprises a first input and a second input forming a differential input to receive signals at the first voltage level, a first output and a second output forming a differential output to provide output signals at the second voltage level, and at least one circuit element coupled between the differential input and the differential output to pull the first output to a lower voltage level than the second output during power-up so that the level shifter powers-up in a desired state.

Abstract: A voltage converter circuit can include a boost converter having a switching transistor and configured to receive an input voltage, produce an output voltage and selectively operate in one of a boost mode, a skip mode and a linear mode. In the boost and skip modes, the boost converter can switch on and off the switching transistor at a switching frequency to produce an output voltage at magnitudes greater than input voltage magnitudes. In the linear mode, the boost converter can turn off the switching transistor at all times to pass the input voltage unboosted to produce an output voltage at magnitudes less than input voltage magnitudes.

Abstract: A method for processing a short message and a communication terminal are disclosed. The method includes: receiving a short message; extracting schedule information from the short message after determining that the short message is a schedule short message; and importing the schedule information into a schedule table. The inventive solution enables the communication terminal to automatically identify the schedule short message upon receipt of the short message and imports such schedule short message into the schedule table without manually operating by the user, thereby improving the user experience and increasing the inner value of the communication device.

Abstract: A method for defending a distributed denial of service (“DDoS”) attack includes analyzing at least one of a running status of a server or a network data stream flowing to the server at the server side to detect whether a DDoS attack occurs on the server and notifying a data stream cleaner that the data stream cleaner needs to clean the network data stream flowing to the server, if the DDoS attack occurs on the server.

Abstract: In one aspect, a level shifter for shifting a voltage level from a first voltage level to a second voltage level and having a predictable power-up state is provided.

Abstract: A method for processing a short message and a communication terminal are disclosed. The method includes: receiving a short message; extracting schedule information from the short message after determining that the short message is a schedule short message; and importing the schedule information into a schedule table. The inventive solution enables the communication terminal to automatically identify the schedule short message upon receipt of the short message and imports such schedule short message into the schedule table without manually operating by the user, thereby improving the user experience and increasing the inner value of the communication device.

Abstract: A management system facilitating deployment of customizations of an enterprise application, with the enterprise application containing software modules pre-installed on a set of servers. In an embodiment, the management system first receives a set of deployment units each containing data defining a manner of configuration affecting the operation of at least some of the software modules to attain the desired customizations, and an enterprise profile indicating the specific subset of deployment units to be deployed in each of the servers. Management system then orchestrates the configuration of the software modules installed on the set of servers according to the data specified in the set of deployment units and the enterprise profile.