Boucherot cell
Encyclopedia
A boucherot cell is an electronic filter
, used in audio amplifier
s to damp high frequency oscillations that might occur in the absence of loads at high frequencies. Named after Paul Boucherot
a boucherot cell typically consists of a resistor
and capacitor
in series, that is usually placed across a load, for stability.
It is commonly seen in analog power amplifiers at the output of the driver stage, just before the output inductor. The speaker coil inductance of a loudspeaker generates a rising impedance which is worsened by the output inductor generally found in analog power amplifiers; the cell is used to limit this impedance.
The documentation for some power operation amplifiers suggests the use of a "boucherot cell between outputs and ground or across the load".
Additionally, boucherot cells are sometimes used across the tweeter of a speaker system, in order to maintain a more constant driving point impedance as "seen" by a passive crossover. In this specific arrangement, the boucherot cell is sometimes also known as a Zobel network.
Some loudspeaker crossover designs aim to stabilize impedance at high frequencies by including Zobel networks.
Electronic filter
Electronic filters are electronic circuits which perform signal processing functions, specifically to remove unwanted frequency components from the signal, to enhance wanted ones, or both...
, used in audio amplifier
Audio amplifier
An audio amplifier is an electronic amplifier that amplifies low-power audio signals to a level suitable for driving loudspeakers and is the final stage in a typical audio playback chain.The preceding stages in such a chain are low power audio amplifiers which perform tasks like pre-amplification,...
s to damp high frequency oscillations that might occur in the absence of loads at high frequencies. Named after Paul Boucherot
Paul Boucherot
Paul Boucherot was an engineer with the Chemin de Fer du Nord . He studied at the elite École supérieure de physique et de chimie industrielles de la ville de Paris where he later also taught electrical engineering...
a boucherot cell typically consists of a resistor
Resistor
A linear resistor is a linear, passive two-terminal electrical component that implements electrical resistance as a circuit element.The current through a resistor is in direct proportion to the voltage across the resistor's terminals. Thus, the ratio of the voltage applied across a resistor's...
and capacitor
Capacitor
A capacitor is a passive two-terminal electrical component used to store energy in an electric field. The forms of practical capacitors vary widely, but all contain at least two electrical conductors separated by a dielectric ; for example, one common construction consists of metal foils separated...
in series, that is usually placed across a load, for stability.
It is commonly seen in analog power amplifiers at the output of the driver stage, just before the output inductor. The speaker coil inductance of a loudspeaker generates a rising impedance which is worsened by the output inductor generally found in analog power amplifiers; the cell is used to limit this impedance.
The documentation for some power operation amplifiers suggests the use of a "boucherot cell between outputs and ground or across the load".
Additionally, boucherot cells are sometimes used across the tweeter of a speaker system, in order to maintain a more constant driving point impedance as "seen" by a passive crossover. In this specific arrangement, the boucherot cell is sometimes also known as a Zobel network.
Some loudspeaker crossover designs aim to stabilize impedance at high frequencies by including Zobel networks.