摘要:
A power management circuit and method are described. In the method, whether a first voltage and/or a voltage source are present is determined. Based on a first result of the determination, the first voltage is converted to a second voltage. A boost converter is used to convert the second voltage to a third voltage. Alternatively, based on a second result of the determination, a buck converter is used to convert the third voltage to the second voltage.
摘要:
A driver circuit includes first switch, configured to selectively couple a first driving node to a power supply node, and a second switch, configured to selectively couple a second driving node to a ground node. The first driving node is coupled to each transistor in a first set of PMOS transistor(s) and the second driving node is coupled to each transistor in a second set of NMOS transistor(s). The driver circuit is configured to propagate a first drive signal in a first direction along an electrical path for biasing the first and second sets of transistors when the transistors in the first set, before receiving the first drive signal, are in a first state. The driver circuit is configured to propagate a second drive signal in a second direction along the path when the transistors in the first set, before receiving the second drive signal, are in a second state.
摘要:
A DC to DC converter includes a switching circuit and a controller. The switching circuit includes an inductor coupled to first and second voltage supply nodes and to a plurality of output loads. The controller is configured to monitor a current through the inductor and to selectively couple the inductor to each of the plurality of output loads such that at least one of the following criteria is met: 1) an average current through the inductor is minimized for the particular output loads coupled to the switching circuit, or 2) minimize a number of times the switching circuit is switched during a charging period for the particular output loads coupled to the switching circuit.
摘要:
A power management circuit and method are described. In the method, whether a first voltage and/or a voltage source are present is determined. Based on a first result of the determination, the first voltage is converted to a second voltage. A boost converter is used to convert the second voltage to a third voltage, Alternatively, based on a second result of the determination, a buck converter is used to convert the third voltage to the second voltage.
摘要:
Embodiments of the invention are related to LDO regulators. In an embodiment, an amplifier drives the gate of a master source follower and of at least one slave source follower to form an LDO regulator. In an alternative embodiment, a charge pump drives the master source follower to form the regulator. Additional slave source followers may be used in conjunction with the charge pump and the master source follower to improve the regulator performance. Other embodiments are also disclosed.
摘要:
Circuit and method for a Class D amplifier. In one exemplary embodiment, an audio amplifier is disclosed. A closed loop configuration for driving high and low side driver transistors is provided, each circuit is compatible with advanced sub micron semiconductor processes. The analog time varying input is coupled to one input of a sigma delta analog to digital converter. A feedback signal from the output is also input to the analog to digital converter. A bit stream is output by the analog to digital converter. A decimator receives this bit stream and downconverts the samples to digital values at a lower frequency. A digital filter with adaptable coefficients is used to filter that signal and a digital pulse width modulator then develops an analog differential PWM signal. A predriver inputs the PWM signal and derives the output gating signals to control the high and low side drivers of a Class D amplifier.
摘要:
A system and method for controlling a power converter is presented. An embodiment comprises an analog differential circuit connected to an analog-to-digital converter, and comparing the digital error signal to at least a first threshold value. If the digital error signal is less than the first threshold value, a pulse is generated to control the power converter. Another embodiment includes multiple thresholds that may be compared against the digital error signal.
摘要:
Circuit and method for a Class D amplifier. In one exemplary embodiment, an audio amplifier is disclosed. A closed loop configuration for driving high and low side driver transistors is provided, each circuit is compatible with advanced sub micron semiconductor processes. The analog time varying input is coupled to one input of a sigma delta analog to digital converter. A feedback signal from the output is also input to the analog to digital converter. A bit stream is output by the analog to digital converter. A decimator receives this bit stream and downconverts the samples to digital values at a lower frequency. A digital filter with adaptable coefficients is used to filter that signal and a digital pulse width modulator then develops an analog differential PWM signal. A predriver inputs the PWM signal and derives the output gating signals to control the high and low side drivers of a Class D amplifier.
摘要:
An efficient database cluster system that uses multiple stand-alone database servers with independent datasets to deliver higher processing speed and higher service availability at the same time with zero transaction losses. In one embodiment, a dynamic serializing transaction replication engine with dynamic load balancing for read-only queries is implemented. In another embodiment, a non-stop database resynchronization method that can resynchronize one or more out-of-sync databases without shutting down the cluster automatic database resynchronization process is implemented. In yet another embodiment, an embedded concurrency control language is implemented in the replication engine for precise control of the dynamic serialization engine for optimal processing performance. In yet another embodiment, a zero-downtime gateway failover/failback scheme using a public Internet Protocol (IP) is implemented. In yet another embodiment, a horizontal data partitioning method for load balancing update queries is implemented.
摘要:
A circuit including an analog-to-digital converter (ADC). The ADC is configured to receive an analog feedback signal and an analog input signal and generate a digital output. The circuit further includes a noise shaper. The noise shaper is configured to truncate the digital output and generate a noise shaper output having a lower number of bits than the digital output, and to shape quantization noise generated during truncation. The circuit further includes a pulse width modulation digital-to-analog converter (PWM DAC). The PWM DAC configured to process the truncated digital output of the noise shaper output and generate a PWM DAC output.