• LTC6268 layout for controlled capacitance

    We would like to use the LTC6268 or LTC6268-10 for a charge-sensitive amplifier application, essentially an integrator with a large resistor in parallel with the feedback cap.

    The input signal is an approximately 100ns wide pulse of 10s to 100s of femtocoulombs…

  • LTC6268-10芯片

    在LTC6268-10芯片手册中,为了减小寄生反馈电容的影响,采用反馈电阻分流的方式减小寄生电容。

    请问,在这种工作方式下,为了使寄生电容降到最低,对电路板的材料类型和厚度有什么要求吗?

  • LTC6268-10 output oscillating

    Hi engineer :

     The scheme is as follows:

    Then I test the J11 signal.The J10 is not connect anything.

    But the waveform is like this.What are wrong.The input or the power?

    Then can I use LT3092 to test the TIA circuit.

    Connect J3 to TIA's J10.Looking…

  • LTC 6268-10 The bandwidth seems to be different from the datasheet.

    Hi

    I turned to Bandwidth simulation in LTSPICE to use the LTC6268-10, but the result was different from the datasheet.

    We want to implement a circuit with a bandwidth of 100MHz or more in the form of a transimpedance amplifier.

    The LTC6268-10 datasheet…

  • RE: I am designing a circuit for driving a differential input ADC. As operational amplifier I use LTC 6254. My design works fine when simulating in LT Spice. However, when it comes to analyzing one of my outputs using a spectrum analyzer voltage level...

    Hi,

    You would at least need an amplifier with a THD of -72 dBc at fin= 5 MHz,  a much faster op amp would do so. Here are the possible choices: LTC6268/LTC6269, and ADA4857. Take note that ADA4857 runs at 5V and LTC6268/9 can run at 3.3 V. Also, reconsider…

  • LTC6268 - Maximum achievable transimpedance gain

    Hi

    What is the maximum achievable transimpedance gain with LTC6268. I wish to design a TIA to amplify a current pulse whose magnitude is around 100 pA and FWHM (full width half maximum) of the pulse is around 0.2 ms for which the rise time expectation…

  • 如何理解跨阻放大器的增益带宽积?

    一个跨阻放大器LTC6268的增益带宽积为500MHz。

    详细参数表内写明GBW=500MHz实在条件f=10MHz下得到。

    这一参数明显与通用运算放大器的增益带宽积不同。

    例如一个通用运放ADA4666-2的定义为

    请问如何理解这种区别?

    跨阻放大器的反馈电阻以及反馈电阻的寄生电容都会影响跨阻放大器的带宽。那么这个f=10MHz下增益带宽GBW=500MHz是怎么测出来的呢??

  • RE: High-bandwidth amplifier for avalanche diode

    Hi kazspore:  If the APD has fairly low capacitance, then the LTC6268-10 can be used in applications up to about 400MHz.

    We also have dedicated TIA's such as HMC799, with a 1GHz data rate, but the gain is 10k Ohms.

  • RE: ADA4817-1/2

    Hi Premsagar,

    ADA4817 would work but it requires a minimum Vs=5V. The closest fit for your application is LTC6268. Let me know if this works. Also, could you share what your application is?

    Regards,

    Jino

  • RE: LTC6269-10 Dev board

    Hi,

    Unfortunately we only have the evaluation board for LTC6268 family. It is a bare unpopulated board, with 3 channels, all for transimpedance amplifiers, with different layouts for more or less feedback capacitance. 

    Evaluation board link.

    Regards,