CMOS transconductance amplifier with floating operating point

Details CMOS transconductance amplifier with floating operating point CMOS transconductance amplifier with floating operating point

1991-12-09

1993-01-26

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, H03F 345

Patent

active

051825252

ABSTRACT:
A CMOS transconductance amplifier with a floating operating point which has low quiescent-current consumption for a voltage-to-current converter. On the other hand, the current yield of the output transistor in an output current mirror for a load current is high. The low quiescent-current consumption is achieved by connecting a coupling transistor used as a low-impedance diode in parallel with an active load in the current output stage of the voltage-to-current converter. The high current yield is achieved by means of a positive-feedback circuit which adds to the quiescent current of the voltage-to-current converter an auxiliary current proportional to the load current, thus forming a floating operating point.

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Joseph N. Babanezhad et al., "A Programmable Gain/Loss Circuit," IEEE Journal of Solid-State Circuits, vol. SC-22, No. 6, Dec. 1987, pp. 1082-1089.
Ludwig G. A. Callewaert et al., "Class AB CMOS Amplifiers with High Efficiency," IEEE Journal of Solid-State Circuits, vol. 25, No. 3, Jun. 1990, pp. 684-691.
Y. Isividis et al., "Design of MOS VLSI Circuits for Telecommunications," Prentice-Hall, Inc., New Jersey, 1985, ISBN 0-13-200643-X, pp. 129-136.
U. Tietze et al., "Halbleiter-Schaltungstechnik," Springer-Verlag, Berlin, Germany, 1980, pp. 352-354, 372-375 ( in German, no translation).

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