SAW
if i have a particular amplifier block which has tunable frequence response .i can smooth the gain ripple. i have tested successfully.
such as a seleceted lpf and a stable low noise amplifier , my friend had designed a GSM lna ,which has 30Mhz bandwidth . adding into saw filter , which itself has 1db ripple in bandwidth . i added one selected lpf and corresponding hpf after caculation ,into the circuit . after test, gain ripple has changed 2.5db to 0.9db.
you can try