Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Recent content by zzm_3392

  1. Z

    The gain difference of 2.4GHz antenna

    Hi, The attachments are 5 types of 2.4GHz antenna collected form the internet. Can anyone tell me the gain difference between them and which one is the best suitable for portable mobile application? Thanks.
  2. Z

    Tunable BPF for power line communication receiver.Help

    Hi niuju, The receving filter accesses into the power line through a transform. So this filter deals with the small signal. I want to design a tunable filter with numerical controlling. It can cover the whole 50-500kHz band by several segments. Can you give me some advices on it? - - -...
  3. Z

    Tunable BPF for power line communication receiver.Help

    Hi biff44, Digital filter is not applicable, because the strong interference cause the A/D into saturation, and the interested signal with interference may be clipped. So i think the suitable way is to reduce the interference in analog domain before A/D. For FETs switching in/out elements...
  4. Z

    Tunable BPF for power line communication receiver.Help

    Hi tony_lth, For this low frequency, can you recommand some low-cost SP4T ? Thanks. - - - Updated - - - - - - Updated - - - Hi eraste, Can you give more details about the localised elements, or show a draft, or recommand a software to design this tunable filter? Thanks.
  5. Z

    Tunable BPF for power line communication receiver.Help

    Hi, Frank. The center frequency of interesting signal (OFDM) is selectable in the 50-500kHz. The bandwidth is 90kHz. The strong interference does not come from the aeiral effect of the power lines. It's from the wired conductive interference when the electrical equipment and mechine are powerd...
  6. Z

    Tunable BPF for power line communication receiver.Help

    Hi, The receiver works in the frequency from 10kHz to 500kHz. But because there exist many strong interferences in this frequency on power line, i want to divide it into several frequency band, such as 10-100kHz,100-200kHz,200-300kHz,300-400kHz,400-500kHz. So the receiver can work in another...
  7. Z

    Which chip can be used to realize the PA gain controlling?

    Dear anyone, I want to complete the PA(eg. RF5110) gain controlling. The voltage range of power control pin Vapc is 0-2.8V. Please refer to the attachment for detailed input characteristics. Which simple chip can be used to realize that the 3.3V or 5V power supply is converted to the Vapc...
  8. Z

    Hlep. 50 Ohm PCB routing problem to dicuss

    Hi all, I routed a 50 Ohm trace to antenna pin. But the pin is on the bottom layer, so i have to connect it through a via(12/25/37mil, drill hole/pad/power isolation diameter) and 10mil trace width. For more detail, please look at the picture. The frequency is 2.4~2.5GHz. Because the...
  9. Z

    Via selection for diffrent signals

    Because the inductance of via is increased as the decreasing drill diameter, so the series impedance is increased, and loss through the via also inceeases.
  10. Z

    Help. Li-Ion battery voltage monitor

    Thanks sky_123. It's a choice. For IC, e.g. BQ27010, it's too expensive only as voltage monitor. Can anyone give me some suggestions about cheap ICs as voltage monitor?
  11. Z

    Help. Li-Ion battery voltage monitor

    Hi all, I need a circuit or a cheap IC to monitor Li-Ion battery voltage(2.9~4.25V) continuously without additional power supply, and it would be best that its power consumption is less than 10mA. I think two methods, but there exits faulty. 1) A/D sampling. There is not precision...
  12. Z

    [MOVED] 4 layer board Stackup

    It's a transceiver. The difference RX and TX are all matched to 200 Ohm, then transformed to single 50 Ohm by a balun HHM1521.
  13. Z

    [MOVED] 4 layer board Stackup

    Hi SughiRam P., Thanks your advice. But differential impedance is 200 Ohm, not 100 Ohm. ---------- Post added at 03:17 ---------- Previous post was at 03:03 ---------- Hi Antonios, Thanks. The 50 Ohm single ended trace is ok. But for 200 Ohm differential traces, there is not suitable...
  14. Z

    Balun Impedance design in PCB layout

    Hi Bigboss, Thanks your suggestion. The midlayer is uesd as GND. If design was based on 2x100 Ohm single ended transmission line for each input, I worried about whether the two single ended transmission line would be affectd by each other. Because there is a parallel inductor with 0402...
  15. Z

    [MOVED] 4 layer board Stackup

    Hi all, I am designing a 4 layer board with total 1.2mm thickness. Based on the stackup, the line width of single 50 Ohm is 0.1835mm. But there are not suitable line width and gap for differential 200 Ohm. Can you give me a recommanded stackup which is suitable for both single 50 Ohm and...
See more

Part and Inventory Search

Back
Top