  This article analyzes the design of a low-noise amplifier intended as the
input front-end for the measurement of the low-frequency components (below 10
Hz) of a 50 Ohm source. Low residual flicker is the main desired performance.
This feature can only be appreciated if white noise is sufficiently low, and if
an appropriate design ensures dc stability. An optimal solution is proposed, in
which the low-noise and dc-stability features are achieved at a reasonable
complexity. Gain is accurate to more than 100 kHz, which makes the amplifier an
appealing external front-end for fast Fourier transform (FFT) analyzers.
