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Consider I gave input of5Mhz bandwidth of analog signal op-amp input and the i need2Mhz bandwidth of output
If you want to apply such relation by mean of controlling the frequency of output regarding the input frequency
As the closed loop gain and the small signal bandwidth of an op amp are closely related, the parameter ‘Gain Bandwidth Product’ is often used to better describe the possible combinations of gain and bandwidth. The graph of the open loop frequency response in Fig.6.4.1 therefore, plots all those points where voltage gain x bandwidth =1.4 million(Hz). For example,140kHz bandwidth multiplied by a voltage gain of10 also gives a Gain Bandwidth Product of:
10 x140kHz =1.4MHz
Note that bandwidth indicated by the Gain Bandwidth Product applies to small signals, but when large AC signals are involved, especially signals with fast rising and falling edges, the bandwidth may be further reduced by the Slew Rate. Then the Power Bandwidth becomes more relevant.
For more assiatance plesae visit:http://www.learnabout-electronics.org/Amplifiers/amplifiers64.php
or
http://en.wikipedia.org/wiki/Operational_amplifier