Ramp signal linearity correction device
The device includes a transconductance amplifier (14) which receives a differential voltage ( DELTA V), representative of the correction required to produce a correction current. The amplifier is biased by a second current source and is mounted as a current mirror on the first current source. The am...
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| Format: | Patent |
| Sprache: | eng ; fre |
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| Zusammenfassung: | The device includes a transconductance amplifier (14) which receives a differential voltage ( DELTA V), representative of the correction required to produce a correction current. The amplifier is biased by a second current source and is mounted as a current mirror on the first current source. The amplifier bias current (Ip) corresponds to a current deducted from the first current source, allocated a positive coefficient ( alpha ). The differential voltage is obtained from two reference voltages related to the positive supply voltage. A differential multiplier (12) produces the differential voltage as a function of a gain instruction (vg) as applied in a voltage to current converter (13) to two differential current inputs (I'1, I'2) supplied by an input stage (11) which receives the capacitor voltage.
L'invention concerne un dispositif (10) de correction de linéarité de rampes d'un signal (VA ) en dents de scie prélevé aux bornes d'un condensateur (C1 ), chargé au moyen d'une première source de courant et déchargé périodiquement à la fréquence souhaitée pour ledit signal, comportant des moyens pour moduler le courant de charge dudit condensateur (C1 ) au moyen d'un courant de correction (Icor ) de façon à rendre les rampes dudit signal non-linéaires et comportant des moyens pour rendre ledit courant de correction (Icor ) proportionnel au courant prélevé sur ladite première source de courant. |
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