Signal processing circuit including a variable gain input stage
AssigneeCsem Centre Suisse D'Electronique Et De Microtechnique SA—Recherche Et DéVeloppement
InventorsEnrique M. Blumenkrantz, Olivier Nys
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Abstract
The invention concerns a processing circuit (2, 120) for producing a variable output signal in response to a variable quantity picked up or received as input. The processing circuit is associated with a stage or has an input sensor (4, 100) furnishing a signal with a variable amplification/attenuation factor, and further exhibits response characteristics which depend in particular from state variables. The processing circuit includes a suppression circuit (FIG. 5, FIG. 6) for suppressing transients normally produced by modification of the amplification/attenuation factor, this suppression circuit functioning by modifying the value of the state variables in direct proportion to the modification of the amplification/attenuation factor.
Claims33
Processing circuit (2, 120) for producing a variable output signal in response to a variable quantity picked up or received as input, said processing circuit being associated with a stage or having an input sensor (4, 100) furnishing a signal with a variable amplification/attenuation factor and said processing circuit further exhibiting response characteristics which depend in particular from a state variable of at least one circuit element of said processing circuit, characterized in that it includes means (FIG. 5, FIG. 6) for suppressing transients normally produced by modification of said amplification/attenuation factor, said means for suppressing transients functioning by modifying the value of said state variable of said circuit element in direct proportion to said modification of the amplification/attenuation factor.
Processing circuit for an analog signal provided to produce a variable output signal in response to a variable input signal, including an input stage with variable gain amplification/attenuation, the response characteristics of said circuit depending from a state variable of at least one circuit element of said processing circuit among others, characterized in that in includes means for suppressing transients normally produced by a modification of the gain of said input stage, said means for suppression of the transients functioning by modifying the value of said state variable of said circuit element as a direct proportion of said modification of the gain.
Dependencies are inferred from the claim text.