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Recent content by rmathur

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    power supply switching noise help

    Put bypass capacitors that should take care of it. I w'ld put a 10 uF and .1uF capacitor to gnd to filter out the noise from the power supply.
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    High voltage amplifier

    Thanks alex, I bought PA85s from apex, but it doesn't have enough jiuce to go upto 1MHz with +/- 100 volts at the output. Do you know of any?
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    High voltage amplifier

    I have to design a high voltage amplifier for an input signal +/- 10 volts p -p, 1KHz to 1MHz. I need almost flat voltage gain of 20 with the circuit. The amplifier drives a capacitive load of aprrox. 10 pF. I guess i could use an opamp with very high slew rate , but i can't find any? Does...
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    encyclopedia of electronic circuits

    schematic capture with cadence pspice torrent grey & meyer and razavi's book are very good to start with, provided you have basic electronics knowledge. I would suggest sedra & smith as a bridge between meyer and the undergrduate electronics.
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    Commercial High Electron Mobility Transistors

    Thanks, I should have my inductors in by tomorrow. I did try to look into circuits for feedback to stabilize the FET, but didn't find any. Do you have any reference or suggestion, i can try.
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    Commercial High Electron Mobility Transistors

    Hi buoli, I have attached the circuit schematic and the prototypes i built, one with BNC and the other one with SMA. For the dc measurements i connect the power supplies VGG and VDD. I have bypassed both these power supplies well with surface mount capacitors. I vary VDD and measure the drain...
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    Commercial High Electron Mobility Transistors

    Thanks Bouli, This is exactly i am struggling with now STABILITY. I made a simple inverting amplifier circuit using 1 such GaAs HEMTs. Used all surface mount capacitors. And as i am trying to measure the DC charachterstics by simply connecting 2 power supplies at the gate and drain, the drain...
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    Commercial High Electron Mobility Transistors

    Thanks Sergio, Another complication is that i have to cool this amplifier to cryogenic temperatures, thus i started with GaAs devices becaouse of Silcon freeze-out. Moreover, the commercial GaAs devices are typically HEMTs but for very high frequencies (>GHz). Can i still use these HEMTs for...
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    Commercial High Electron Mobility Transistors

    I have to design a low noise amplifier in frequency range 10Khz to 10MHz. I am planning to use GaAs transistors for that. Any suggestions, which one to look on and where?
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    GaAs HEMTs for low frequency applications

    I am designing a low noise amplifier. This amplifier need to go to cryogenic temperatures < 4Kelvin. Thus, i picked up GaAs HEMTs from Fujitsu (now Eudyna). My bandwidth of interest is 1KHz to 10 MHz and these devices are recommended to be used for High GHz range. Do i have any other options as...
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