I'm looking for a tunable lowpass filter to be used between a signal generator's output and an input of an ADC. Basically, it works as an antialiasing filter.
The desired frequency specifications of this tunable filter are as follws:
start frequency - dc,
stop frequency - 20~50MHz which can be selectively set.
I searched several vendors, but most tunable filters' stop frequencies are few tens kHz. Is there anybody who knows vendors to provide such tunable lowpass filter with the spec as above?