What is the relationship between frequency range and GBW in amplifiers?

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The discussion centers on the relationship between frequency range and gain-bandwidth product (GBW) in amplifiers, specifically op-amps. Frequency range is confirmed to be synonymous with bandwidth in this context. The calculation of GBW as A_v * BW is questioned, emphasizing that this formula assumes a single-pole roll-off, which may not apply to all systems. The participants highlight that a specified upper frequency limit does not necessarily indicate a first-order system. Clarification is sought regarding the type of amplifier and the reasons for the lower cutoff frequency.
Omsin
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I have an op-amp with frequency range 20Hz - 20kHz. Is frequency range the same as bandwidth?
 
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Let's say I have 40 dB amplification and frequency range of 20 Hz - 20 kHz

Is my GBW = A_v * BW = 100 * 20k = 2 MHz?
 
Omsin said:
Is frequency range the same as bandwidth?

in this context ... yes

what is the op-amp ? ... that's a really narrow freq range

Omsin said:
Let's say I have 40 dB amplification and frequency range of 20 Hz - 20 kHz

Is my GBW = A_v * BW = 100 * 20k = 2 MHz?

will let some one else answer that
 
Omsin said:
Let's say I have 40 dB amplification and frequency range of 20 Hz - 20 kHz
Is my GBW = A_v * BW = 100 * 20k = 2 MHz?
No, not in general - the definition of the GBW is based on the assumption of a single-pole roll-off.
A specification of an upper frequency limit does not automatically imply a 1st-oder system.
What kind of amplifier are you speaking of? What is the reason for the lower cut.off frequency?
 
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