A multistage amplifier has a low-pass response with three

A multistage amplifier has a low-pass response with three real poles at s = – ω₁, s = – ω₂ and s = – ω₃. The approximate overall bandwidth B of the amplifier is given by

1. B = ω₁ + ω₂ + ω₃
2. 1 = 1 + 1 + 1
  B ω₁ ω₂ ω₃
3. B = (ω₁ ω₂ ω₃)^{1 / 3}
4. B = √(ω₁² + ω₂² + ω₃²

Cascading amplifier results in higher low– 3dB frequency and higher 3– dB frequency.

	1	=	1	+	1	+	1
	B		ω₁		ω₂		ω₃