Article | REF: E320 V2

Low frequency voltage amplifier with low input amplitudes

Authors: Farouk VALLETTE, Geoffroy KLISNICK, Sylvain FERUGLIO

Publication date: November 10, 2025 | Lire en français

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4. Frequency response

Here, the frequency response of voltage amplifiers will be described in relation to temporal issues such as rise/fall times and dynamic stability. The gain G _V of a voltage amplifier depends on frequency. It depends mainly on two parameters: the voltage gain in the passband G _V0 and the cutoff frequency f _C . This section shows how to establish the gain-bandwidth product, GBW, of a voltage amplifier.

For educational purposes, the frequency responses shown (on a log-log scale) are not the actual curves. The asymptotic curves are the most interesting, as they clearly show the asymptotic changes in direction caused by the poles or zeros of the transfer functions.

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Bibliography

(1) - LATORRE (B.), BERLAND (C.), DE DIEULEVEULT (F.), DELABIE (C.), FRANÇAIS (O.), POULICHET (P.) - Électronique analogique. - Dunod (2018).
(2) - REDON (M.) - Cours d'électronique analogique. - Maîtrise EEA UPMC (2001).
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There are numerous norms and standards in this field. They are linked to international organizations, including:

IEC (International Electrotechnical Commission): international standardization organization in the fields of electricity, electronics, electromagnetic compatibility, and micro- and nanotechnologies. This organization defines, in particular, the characteristics...

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