Fully differential line driver circuit having common-mode feedba

Details Fully differential line driver circuit having common-mode feedba Fully differential line driver circuit having common-mode feedba

1993-09-22

1995-01-10

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330258, 330255, H03F 345

Patent

active

053811127

ABSTRACT:
A fully differential line driver circuit (25) includes an input differential amplifier (26) and double-ended differential amplifiers (27, 28). A first output driver stage (29) includes a pair of series connected transistors (30, 31), and a second output driver stage includes a pair of series connected transistors (33, 34). The differential amplifiers (27, 28) provide bias and signals voltages to the gates of the series connected transistors (30, 31, 33, 34). The output stages (29, 32) provide differential output signals for driving a low impedance load. The clamping circuits (35-38) control overlap currents in the output stages (29, 32). Common-mode feedback is used to ensure a common-mode voltage of the differential output signals remains at a predetermined voltage to ensure maximum signal swing and thus, maximum efficiency.

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patent: 5150071 (1992-09-01), Bouzidi
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patent: 5225791 (1993-07-01), Ohta
patent: 5281924 (1994-01-01), Maloberti et al.
Khorramabadi, "A CMOS Line Driver with 80-dB Linearity for ISDN Applications", IEEE Journal of Solid-State Circuits, vol. 27, No. 4, Apr. 1992, pp. 539-544.
Castello et al., "A High-Linearity 50-.OMEGA. CMOS Differential Driver for ISDN Applications", IEEE Journal of Solid-State Circuits, vol. 26, No. 12, Dec. 1991, pp. 1809-1816.
John A. Fisher, "A High-Performance CMOS Power Amplifier", IEEE Journal of Solid-State Circuits, vol. SC-20, No. 6, Dec. 1985, pp. 1200-1205.

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