A high speed and high gain operational amplifier

H - Electricity – 03 – F

Patent

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Details

H03F 3/45 (2006.01)

Patent

CA 2295840

The present invention relates to the design of high speed and high gain operational amplifiers for use in for example high performance switched- capacitor analog circuits. Increasing the gain without suffering the speed may be achieved by designing the amplifier as a single-stage operational transconductance amplifier with single cascode for the N-type transistors (M8, M9) and double cascode for P-type transistors (M4, M5 and M10, M11). The invention may also comprise a continuous-time common-mode feedback. With this design of the invention, high speed and high gain can be maintained with a large phase margin to guarantee the stability.

L'invention concerne des amplificateurs opérationnels très rapides et de gain élevé conçus pour être mis en application dans, par exemple, des circuits analogiques très performants à capacités commutées. Ces amplificateurs permettent l'augmentation du gain sans altérer la vitesse, étant donné qu'ils consistent en des amplificateurs opérationnels à transconductance et à un seul étage à simple cascode pour les transistors de type N (M8, M9) et double cascode pour les transistors de type P (M4, M5 et M10, M11). L'invention concerne éventuellement, de plus, une rétroaction de mode commun à temps continu. Elle permet de conserver une vitesse et un gain élevé avec une marge de phase importante afin de garantir la stabilité de ces amplificateurs.

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