Hello,

I am curious about the working frequency range for the 33502A Isolated Amplifier. Looking at the specs, it looks like it might be only for low frequencies. On the other hand, it looks like it is meant as an add-on to Agilent function generators, which have a broad frequency range.

-Nate

I am curious about the working frequency range for the 33502A Isolated Amplifier. Looking at the specs, it looks like it might be only for low frequencies. On the other hand, it looks like it is meant as an add-on to Agilent function generators, which have a broad frequency range.

-Nate

It does pair well with the 33500 series generators, however the 33502A is for low frequencies.

It can output up to 50VPP at 100kHz and a -3dB point at 300kHz. Performance drops off very quickly after 300kHz.

You are limited by the slew rate which is >20V/us

The industry for amplifiers defines full power bandwidth as the maximum frequency you can do a sine wave without significant slewing distortion. Small signal is the bandwidth (usually -3db) for signals that are small enough to not be affected by slewing, only linear reducers of amplitude.

The max output at 300kHz that you can output without slewing is 10.6 Vpk.

I chose 300kHz because it is the small signal bandwidth we characterized in the data sheet.

Slew rate = 2*pi*f * VPk

Then you divide by 1E6, to put it in V/uS

Example

2*3.14159*300E3*10.6 = 19.98E6 V/S

Which equals

19.98V / us

Let’s say you want to output 12VPP. You could calculate the max frequency that you can output 12VPP (6Vpk).

20V/us = 2*pi*f *6/1E6

f = 20E6/(12*pi) = 530.52 kHz

Again this is for a sine wave, and remember there is a linear reduction in amplitude, so the voltage you need to input to get 12VPP out at this frequency is not a simple 12VPP/5. You will have to play with the input voltage until your output result is the desired 12VPP.