Differential amplifier circuit having a driver with...

H - Electricity – 03 – F

Patent

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H03F 3/45 (2006.01) H03F 1/32 (2006.01)

Patent

CA 2114264

A differential amplifier circuit having a superior transconductance linearity within a wider input voltage range, which includes a first differential pair of transistors and a driver circuit for driving the differential pair by its output current. This output current has a square-law characteristic to compensate in nonlinearity the transconductance of the differential pair. The driver circuit is a squarer or a quadritail circuit. A signal to be amplified is applied to a pair of input terminals. Input ends of the differential pair are connected to a pair of input terminals to be applied with a first input signal. Input ends of the driver circuit is connected to the pair of input terminals to be applied with a second input signal. The first and second input signals are proportional in amplitude to the signal to be amplified.

'invention est un circuit amplificateur différentiel à linéarité de transconductance de qualité supérieure dans une gamme de tensions d'entrée plus large, qui comprend une paire de transistors différentielle et un circuit servant à attaquer cette paire différentielle. Le courant de sortie du circuit d'attaque a une caractéristique quadratique afin de corriger les non-linéarités de transconductance de la paire différentielle. Le circuit d'attaque est un circuit à sortie quadratique. Les signaux à amplifier sont appliqués à une paire de bornes d'entrée. Les entrées de la paire différentielle sont connectées à une paire de bornes d'entrée qui sert à recevoir un premier signal d'entrée. Les entrées du circuit d'attaque sont connectées à une paire de bornes d'entrée qui sert à recevoir un second signal d'entrée. Ces deux signaux d'entrée ont des amplitudes proportionnelles à celles du signal à amplifier.

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