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Recent content by tycheng

  1. tycheng

    output impedance measurement of oscillator

    Thank you for your comments Biff44!!:D
  2. tycheng

    output impedance measurement of oscillator

    Does there anyone know how to measure the output impedance of an oscillator? Is it possible to measure it by network analyzer?
  3. tycheng

    gain mismatch and phase mismatch measurement

    Hello everyone, Does there anyone know how to measure the gain mismatch and phase mismatch of this IQ reveiver front end? ......................................|-->gilber cell mixer---> I channel input RF signal--> LNA--> | ......................................|-->gilber cell mixer---> Q...
  4. tycheng

    specific LED behaviour: how can I achieve this?

    Hi! guys, I think on1aag is right. The transistor of his circuit was used in breakdown region as the picture shows. There is no oscillator needed in his circuit. This is quite smart. But is there any reliability problem? Added after 3 minutes: the picture
  5. tycheng

    specific LED behaviour: how can I achieve this?

    Does the BC548 a PNP transistor? the symbol of this transistor seems wrong? Added after 3 minutes: sorry, it should be NPN..... and the arrow of the transistor should points downward Added after 8 minutes: But why there is no base bias in this circuit? Is BC548 a special kind of transistor?
  6. tycheng

    specific LED behaviour: how can I achieve this?

    please don't forget to press the help button if it works.......
  7. tycheng

    specific LED behaviour: how can I achieve this?

    Maybe you can try this circuit....... Use the variable resistor to control the brightness of light!!
  8. tycheng

    impedance matching for MCU communications? needed?

    I think you need to match your 8 slave MCUs with simple resistors. but you need to check the driving capability of master MCU. ty
  9. tycheng

    A question on Root Locus: why 45 degree is used?

    A question on Root Locus could you describe that question more clearly?
  10. tycheng

    MOSFET biasing in ADS

    try to use feedback. DC is in negative feedback and AC is in no feedback......
  11. tycheng

    How to improve reference buffer transient load regulation?

    buffer circuit load regulation Check the control theory...... You need to have a high damping ratio
  12. tycheng

    How i can improve my power wireless phone?

    communication add an power amplifier
  13. tycheng

    Help me calculate SNR of a FM modulation signal in Matlab

    Who can help me ? My boss asked me to calculate SNR of a FM modulation signal in MATLAB Who can help me? I need your help..................
  14. tycheng

    somebody know how to get the SNR of a modulation fm signal

    snr in fm modulation Does there anyone know how to get the SNR from a modulation FM signal spectrum plot? Thank you for your help......... Added after 2 minutes: BTW the FM modulation plot was in Matlab format
  15. tycheng

    Looking for part time job

    Offer free part time job where do you live ?
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