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  • Ten Daily Electronic Common Sense-Section 114

    In general, what are the main methods for designing the wake-up mechanism circuit?

    • The rectifier rectifies the RF signal received from the electromagnetic field, and produces a rectified voltage output of 1V. to make the transistor transition from a fully off state to a fully on state.
    • The rectifier rectifies the RF signal received from the electromagnetic field to produce a rectified voltage output of 5mV. The rectified voltage is compared with an internal reference voltage to trigger the transistor from a fully off state to a fully on state.

    What stages can EC0 be applied to?

    EC0 can be mainly applied in the HDL stage and the netlist stage of the design.

    What are the main disadvantages of thermistors?

    The main disadvantage of thermistors is that their resistance is nonlinear with temperature changes. Component stability and interchangeability are poor.

    What is the test principle of COS?

    1. The test requirements are detailed and comprehensive, and all functions that the card should complete must be tested. When an incorrect command is entered or the operation is wrong, the program (COS) should automatically abort. Gives information that an error has occurred, and cannot change the relevant data originally stored in the card.
    2. The test plan should be considered in the hardware design and COS design stage. For this reason, some special test circuits may be added to the chip, and some observation points and melting wires may be set. The fuse is disconnected after testing or personalization is complete, thereby limiting the execution of certain operations in the future and maintaining the security of the card. When designing a COS, consideration should also be given to how to divide program modules to facilitate debugging.
    3. IC cards have to go through multiple steps from design, production to the final product, and each step may produce waste. In order to detect unqualified intermediate products as early as possible, in principle, each process should be tested.

    What is the role of the source module?

    The role of the source module is to provide the local oscillator (Local Oscillator) for the transmit and receive channels.
    The amplified carrier signal is divided into two paths by the power divider:
    All the way to the sending module;
    The other way is sent to the receiving module.

    What is the procedure for sending an address?

    Set TXWAKE=1 and write the appropriate address value to the transmit data buffer register (SCITXBUF).
    When the address value is sent to the transmit shift register (TXSHF) and sent out, its address bit is set to 1. and tell other controllers on the serial line to read the address value.
    After the transmit shift register (TXSHF) and the WUT flag are loaded, write the new value to the transmit data buffer register and the TXWAKE flag. Set the TXWAKE bit to 0 to transmit the data frame for this block.

    What are the three categories of micromachining technology?

    Micromachining techniques are broadly divided into three categories:
    Silicon micromachining technology;
    Ultra-precision machining technology;
    X-ray deep lithography electroforming technology.

    What are the classifications of inductors and transformers?

    • Types of Inductors:
      1. Classification by structure Inductors can be divided into wire-wound inductors and non-wire-wound inductors (multi-layer chip, printed inductors, etc.) according to their different structures, and can also be divided into fixed inductors and adjustable inductors. inductor. Fixed inductors are further divided into hollow electronic meter inductors, magnetic core inductors, iron core inductors, etc., and can also be divided into vertical co-directional pin inductors and horizontal axial pin inductors according to their structure, shape and pin mode. Inductors, large and medium-sized inductors, small and exquisite inductors and chip inductors, etc. Adjustable inductors are further divided into magnetic core adjustable inductors, copper core adjustable inductors, sliding contact adjustable inductors, series mutual inductance adjustable inductors and multi-tap adjustable inductors.
      2. Classification according to working frequency Inductors can be divided into high-frequency inductors, intermediate-frequency inductors and low-frequency inductors according to working frequency. Air core inductors, magnetic core inductors and copper core inductors are generally medium frequency or high frequency inductors, while iron core inductors are mostly low frequency inductors.
      3. Classification by use Inductors can be divided into oscillating inductors, correction inductors, kinescope deflection inductors, choke inductors, filter inductors, isolation inductors, compensated inductors, etc. Oscillating inductors are further divided into TV line oscillating coils, east-west pincushion correction coils, etc. Kinescope deflection inductors are divided into line deflection coils and field deflection coils. Choke inductors (also called choke coils) are divided into high frequency choke coils, low frequency choke coils, choke coils for electronic ballasts, TV line frequency choke coils and TV airport frequency choke coils. Filter inductors are divided into power (power frequency) filter inductors and high-frequency filter inductors.
    • Types of Transformers Transformers can be classified according to their operating frequency, use and core shape:
      1. Classification according to working frequency Transformers can be divided into high-frequency transformers, intermediate-frequency transformers and low-frequency transformers according to working frequency.
      2. Classification by use Transformers can be divided into power transformers, audio transformers, pulse transformers, constant voltage transformers, coupling transformers, autotransformers, and isolation transformers according to their uses.
      3. Classification according to the shape of the iron core (or magnetic core) Transformers can be divided into “E” type transformers, “C” type transformers and toroidal transformers according to the shape of the iron core (magnetic core).

    What is the purpose of MPEG.1?

    MPEG. The purpose of 1 is to meet the needs of various storage media for a unified format of compressed video, which can be used to compress ordinary video. Provides continuous, coded representation of moving images at a rate of around 1.5 Mb/s. The most popular applications are VCD, video conferencing, video surveillance, computer storage, etc.

    What are the main parameters that wind turbines need to monitor?

    Wind speed, wind direction, rotor or generator speed, electrical parameters (frequency, voltage, current, power, power factor, power generation, etc.) and temperature (generator winding temperature, bearing temperature, gearbox oil temperature, control cabinet temperature, external environment temperature) etc.


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