I'm a graduate student from Taiwan.
I want do a circuit that function is do the analog signal multiply transform and response time below 10 ns.
And I fond a IC AD835 says it have 250 MHz bandwidth.
I just want do the basic operation that output w=inputsignal1(t)*inputsignal2(t)
I grounded pin 2,4,7 and input a signal to both pin1&8 by a function generator.
And use a oscilloscope to see the output w.
The attachment is the result.(the input is 10MHz sine wave and 100kHz square wave)
I wanna ask how can I solve the following question.
1.SNR is too small.
2.There seems have a phase shift between input and output.
3.When input is Square function and output has a oscillation.
4.Output signal dose not stable.
5.Best have a flatness gain to 80MHz
Does any have any suggest module circuit?