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2151460-1_TE Connectivity_Crimpers, Applicators, Presses

来源:LM317 Electronics Components编辑:MEAN WELL时间:2021-06-15 14:58:14

The 150MBit/s speed of MOST150 gives ample bandwidth for today’s applications like data, video and audio. MOST150 will also be able to support the performance requirements for driver assistance applications that are gaining popularity. Certain applications such as uncompressed video or consumer interfaces (i.e. USB3.0 or Thunderbolt) require higher transmission speed in the range of up to 10 GBit/s. A next-generation MOST system that supports such speeds will likely introduce a new physical layer implementing glass fiber components due to the higher bandwidth than POF. Using Avago’s experience and proven technology of high-speed parallel transceivers running at up to 120GBit/s, first evaluations with VCSEL based transceivers are being conducted. Both from a reliability and performance point of view the use of VCSEL-based transceivers is expected to be feasible for future automotive applications.

Further enhancing the functionality of the ADCs are up to five high-performance analog signal conditioning blocks (SCBs) per device. Each SCB comes packed with two high-voltage bipolar monitors (with 1% accuracy), a high-gain current monitor, a temperature monitor (with 0.25°C resolution), and two high-speed comparators.

Rather than burden the embedded Cortex-M3 processor with low-level initialization and control of the analog front-end (AFE), SmartFusion includes an innovative analog compute engine (ACE). The ACE operates as a second processor and can, for example, automatically adjust the resolution of the ADCs sample by sample, or after a preset amount of time. The engine can also automatically increase or decrease ADC resolution over time, or delay the samples from one ADC channel to another.

2151460-1_TE Connectivity_Crimpers, Applicators, Presses

Flexible FPGA fabric Accessible to both the microcontroller subsystem and the analog compute engine is the SmartFusion fabric. Based on the proven ProASIC3 flash FPGA architecture, the SmartFusion fabric provides the user with up to a half million system gates worth of logic plus up to 108 kbits of embedded RAM.

This highly flexible fabric can communicate with the microcontroller subsystem via the AHB bus matrix. Because the fabric can act as either a slave or master to the bus, functions implemented in the fabric can be slaved to the processor.

These abundant resources are available to the user to build additional peripherals and custom functions. Users also have access to Microsemi’s DirectCore library of more than 50 different IP blocks and to other IP blocks developed by independent third-party suppliers.

2151460-1_TE Connectivity_Crimpers, Applicators, Presses

Built on proven flash technology At the foundation of SmartFusion architecture is Microsemi’s CMOS flash process. As a result, SmartFusion devices benefit from all of the advantages that flash technology brings to programmable devices, such as low power and firm error immunity. Of importance to embedded designers is the fact that the SmartFusion device is nonvolatile, providing a true single-chip solution that is live at power-up – a must for any true system-on-chip (SoC) solution.

PMSM as a complex example The prevalent technique for controlling PMSMs is vector or field-oriented control (FOC). In field-oriented control, the stator current is controlled to align with the rotor magnetic field at 90 degrees to achieve maximum torque at any given time.

2151460-1_TE Connectivity_Crimpers, Applicators, Presses

As a result, FOC requires calculating a number of vector transforms (for example, Clarke and Park) for accurate determination of current motor state. Furthermore, space vector pulse-width modulation (SVPWM) should be implemented along with FOC to reduce harmonics and achieve better efficiency compared to traditional pulse-width modulation (PWM).

Early implementations of this algorithm were realized in application-specific integrated circuits (ASICs), and later using digital signal processors (DSPs). An ASIC approach, while highly integrated, is expensive and no longer practical. DSPs made low-cost high-speed control possible, but require a number of support devices to complete the solution.

In many op amp circuits, the DC bias supply can impact the performance of the op amp, especially when used with high-bit-count analog-to-digital converters (ADC) or for signal conditioning of sensitive sensor circuits. The DC-bias supply voltage determines the amplifier’s input common-mode voltage as well as many other specifications.

During power-up, the sequence of the DC-bias supply must be coordinated to prevent the op amp from latching up. This can destroy, damage, or prevent the op amp from operating correctly. This article explains the importance of tracking power supplies for op amps and provides a method to easily implement a tracking, split-power supply from linear regulators that normally do not have tracking capabilities.

There are two common ways to power an op amp. The first and easiest is to use a single, positive power supply as shown in Figure 1(a) . The second method is to use a split- (or dual-) power supply, shown in Figure 1(b) , which provides both a positive and negative voltage. The split supply is useful in many analog circuits since it allows for input signals that include zero-volt potential or input signals that swing both positive and negative.

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