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Distributed amplifier: Difference between revisions
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* midband gain: 120 | * midband gain: 120 | ||
* risetime: 5ns | * risetime: 5ns | ||
Consider a designer who is working with a technology that produces | |||
amplifier stages like Amplifier 1 in the example above. If he needs | |||
a total gain of 100 with a risetime of 3ns, he is constrained by the | |||
gain-bandwidth tradeoff and is unable to meet both goals simultaneously. | |||
The solution is found in the distributed amplifier. In a distributed amplifier | |||
several stages are connected together to form, in effect, a transmission line | |||
with gain. The gain is the sum (not the product) of the gains of the stages. | |||
The bandwidth of a distributed amplifier is the bandwidth of each of the stages. | |||
Thus, it is possible to construct an amplifier with a gain of 100 and a risetime | |||
of 3ns by using ten instances of Amplifier 1 connected to form a distributed amplifier. | |||