Analog and electronic circuits

An op-amp with a gain-bandwidth product (GBW) of 1 MHz is used to build a non-inverting amplifier with a gain of 10. What is the approximate bandwidth?

  1. AAbout 10 MHz
  2. BAbout 10 kHz
  3. CAbout 100 kHz
Show answer and explanation

Answer: C. About 100 kHz

The product of an op-amp's gain and bandwidth is roughly constant (the gain-bandwidth product). With a GBW of 1 MHz, a gain of 10 gives a bandwidth of 1 MHz ÷ 10 = about 100 kHz. To get both high gain and wide bandwidth, choose an op-amp with a larger GBW or split the gain across several stages.

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