Less than 5ns Square wave pulse with more than 150mA output current

Hello Vinod,

   We would need more information for us to be able to suggest a device. What are your input and output limitations, gain of your application, power supplies, differential or single ended output, and any other important considerations for your application that I have not listed? From your description, it seems like you would be using the signal generator as the input of this amplifier. If it can not meet your required under 5ns rise time, then your entire application would not be able to achieve this specification. 

Thank you,

Sima 

Hi Sima,

     Thank you for your reply. here's what i need

1. Inputs to the cable measurement are two cases. Which i was generating it from signal generator Keysight 81150A. 

1a. Common mode signal of 5V

1b. Differential signal of +/- 5V

currently i dont have this signal generator hence find some device and with any other additional circuitry to achieve the requirement

2. No specific to gain or power supplies

Regards

Vinod kanoji

Hello Vinod,

   I am assuming you would want this at a gain of 1. I would recommend these parts to achieve a +/-5V signal output at less than 5ns with an output current of 150mA: device list. If you want less than 2ns, you should choose the devices in the list which have slew rates that are higher than 2500V/us. 

Thank you,

Sima

Hi Sima,

    I need two outputs i.e second one should be the inverting output. Since i told you that i want to create differential output. 

one more thing as i told you i have two test cases where in 1st case in need common mode test (Single output) and in second case i need to produce differential signal (Two outputs). hence do i need to use IC with min of 3 outputs (one inverting output included).?

Regards

Vinod Kanoji

Hello Vinod,

  Sorry for delay in response, I mistook your requirements as for the input of the amplifier. There are no amplifiers that have that capability; you will need atleast two amplifiers. In that case, I would suggest one to be a current feedback amplifier such as the THS3491 or any of these current feedback amplifiers: device list ,and the other being a line driver such as the THS6212 or THS6222. 

Thank you,

Sima

Hello Sima,

    1. How do you plan to give inputs to these IC's since these require differential inputs. are you interpreting me to give input from signal generator with whatever rise/fall time?

    2. I think line driver needs bit complex circuit to be designed and package is with no lead visible but i need something that i could hand solder.  do you have any simple solution.

Regards

Vinod Kanoji

Hello Vinod,

   Here are some documents you should look at. There are two ways to get a differential output using amplifiers: link1, link2, link3. The first link uses two amplifiers, the second and third uses a fully differential amplifier which can be configured as a single ended input, with the other input either grounded or voltage biased. Instead of the line drivers, you can use a fully differential amplifier (device list) with a buffer to increase the output current. I suggested the line drivers; since the fully differential amplifiers would not be able to output very high currents that you require.

Thank you,

Sima