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.

Search results

  1. J

    Design of a VGA for commercial TV preamplifier

    Hello all. Does anybody know how to design the typical VGA for a commercial TV preamplifier? In the picture attached, i dont know if the trimmer (7 to 22 dB) is a variable resistor or a variable capacitor. How does it work? Thank you.
  2. J

    [SOLVED] LNA with bypass switching

    Hi all. I have implemented on PCB the circuit attached (LNA with bypass) but it's not working properly. If I open the circuit at node VA, and apply an external voltage of 5V, as a control analog signal of the switch, the bypass is done by the two switches (SW1 and SW2), each one is in the state...
  3. J

    noise figure at different frequencies

    How to calculate noise figure for frequency F1 in the following system? RXin@F1 -> LNA -> MIXER1 -> AMP@F2 -> MIXER2 -> DRIVER -> TXout@F1 F1 es the same frequency for RXin and TXout. Mixer1 downconverts F1 to F2 (intermediate frequency), and Mixer2 upconverts F2 to F1, where F2<<F1 How is...
  4. J

    FM Modulator with PLL

    Hello all, in a FM modulator with PLL, I wonder if someone knows the ratio which is usually used between the PFD (phase frequency detector) and the DC modulating frequency. I think PFD must be greater than the DC modulating frequency, otherwise PLL will not work. Is that true? Does anyone know...
  5. J

    OFDM Receiver: DSP/FPGA Delay Time

    Hello all, I want to carry out an experiment which consists of "operating" a digital TV channel in the UHF band in order to remove/add contents. The DTV channel is 64QAM, 8MHz bandwidth, 8K subcarriers. After de decoder, the DSP/FPGA will deal with the streams, and then will be encoded again...

Part and Inventory Search