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Recent content by rajan_pec

  1. rajan_pec

    What Pout of LNA at out of band frequency spot

    Hi all, I have simulated Qorvo TQL9044 LNA (internally matched for 1.5GHz to 4GHz band). At 5.2GHz (out Band), simulation responses are : S11 (IRL) is -0.47dB; S22(ORL) is -5.8dB and S21(gain) is -4.96dB. Question: If I feed -20dBm as input power to this LNA at 5.2GHz then what will be the...
  2. rajan_pec

    How I can switch or route -75V & +5V to set of PIN diodes as required

    "Do all gates have a definite voltage being sent to them?"--->> Yes, 0V (low) to provide +5.0V at the Drain terminal of MOSFET & +5.0V (high) to provide -75V at the drain terminal of the MOSFET " do you switch them so the gate is disconnected?"-->>Switching of each gate terminal is done through...
  3. rajan_pec

    How I can switch or route -75V & +5V to set of PIN diodes as required

    PROJECT DESCRIPTION: There are 6 different channels or filters ( based on frequency ) to route the RF signal. Each channel or filter is made up of a circuit containing a set of PIN diodes. To switch on to the particular channel or filter (let say channel-1)PIN diodes of that...
  4. rajan_pec

    Gate Control voltage, Vgs, values for IRF6216pbf MOSFET device

    Observation: 100 ohm POT(R84) in the source terminal needs to be removed & instead of +1.8V ,minimum +5V to be given at Source terminal. Now , if gate is at +5V, then -75V will be available at drain (or R86) & if gate is at 0V, then +5V (source terminal voltage) will be available at drain (or...
  5. rajan_pec

    Gate Control voltage, Vgs, values for IRF6216pbf MOSFET device

    Hi, Check the attached jpeg file (schematic n description) regarding circuit of IRF6216pbf MOSFET. IRF6216pbf is a HEXFET mosfet from International Rectifiers. I am using it to switch on/off the PIN diode based RF channel. TO switch OFF the channel, PIN diode should be biased with -75V and to...
  6. rajan_pec

    50V GaN device Bias Sequencing Card

    Update: For initial testing , I have bypassed the temp compensation ckt. -4.6V Vout is taken out at connector through a three pin trimmer resistor (2K ohm). Thru this trimmer i am able to vary Vg from (-4.5V to -0.5V). Vd (+48V) and Vg (-4.2V) signals switching timings are captured on CRO...
  7. rajan_pec

    50V GaN device Bias Sequencing Card

    Thanks for the reply. Board is working fine now. Earlier I was feeding +30V as Vcc which was not enough to provide more than +3.0V at UV pin. After feeding +40V and resoldering the N-MOSFET & Zener Diode (BZX) , board is providing required Vd at the output. Regards, Rajan - - - Updated - - -...
  8. rajan_pec

    50V GaN device Bias Sequencing Card

    Hi, I need to have Bias Sequence card for GaN based Power Amplifier. GaN based device needs sequencing , Gate voltage (-5V to -2V) first and then Drain voltage (Vd) (28 to 50V). I have followed the app note (attached here) for my requirement. I have placed N-Channel MOSFET (PSMN8R2-80YS) in...
  9. rajan_pec

    searching for MOSFET or BJT to act as switch to channel the one voltage out of two

    Hi, I am designing a power supply for a RF switch filter bank (SFB). This SFB has six channels and only one channel will be activated at one time. It means one channel on & other five channels will be off for an instant of time. Conditions for switching ON the channel (consists of series n...
  10. rajan_pec

    ism transceiver with better TX channel filtering?

    Hi biff Have you selected the Transceiver IC among CC1101 and ADf7023? I wants to develop RF modem based on ADF7023 IC as it provides on board RISC processor for packet level data handling. If you are working on ADF7023 , kindly suggest me the points to be kept in mind while designing PCb as...
  11. rajan_pec

    Design of High Power Broadband Amplifier

    Hi all, I want to design a Power Amplifier system having Basic requirements : 1. Frequency BW : 1GHz (UHF range) 2. RF output : 10W (linear) 3. Return Losses: -10dBm or less Here challenge is to have constant gain over the 1GHz of Bandwidth. I am browsing the vendor's websites n...
  12. rajan_pec

    Broadband power amplifier transistor

    Hi, Any comments on the performance of Triquint's "Power Band" range of RF power amplifier ICs. As per triquint these devices has wideband application and provides single impedance matching over the wideband. Kindly give ur comments plz. Regards, rajan
  13. rajan_pec

    Broadband power amplifier transistor

    Hi all, I am searching for a 10W (40dBm) PA IC. Kindly suggest me the best available PA ICs in the market. My requirement in that PA IC should not have complex impedance matching, 1GHz of freq band operation & exhibits good return losses. Kindly share some good application notes too based on...
  14. rajan_pec

    Problem in coding-PIC18F controlling TRF7960 RFID IC

    hi, Do u already know the IDs of Tags(based on ISO15693) that you have? I am asking this question becoz, if u know the IDs inadvance and if one of the tag has ID with LSB (least Significant Bit) =0. You should debug your reader with this tag first. If you are able to recover the ID of this tag...
  15. rajan_pec

    Problem in coding-PIC18F controlling TRF7960 RFID IC

    hi, As per TRF7960 supporting document SPI interface. dummy clk cycles are required to read the spi data. Have u implement this dummy clock cycles while reading data??? Or it may be that ur RFID tags may not belong to slot 0 and you are also facing the same problem like me, i.e switching to...

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