Folded cascode operational amplifier with gain enhancing base cu

Amplifiers – With semiconductor amplifying device – Including differential amplifier

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330261, 330311, H03F 345

Patent

active

053231210

ABSTRACT:
The gain of a folded cascode operational amplifier is enhanced by connecting the current circuits of added compensation transistors to supply the current circuits of pre-existing gain transistors. Changes in the current through the primary gain transistor resulting from a change in the output load produce approximately equal changes in the base currents of both the primary gain and primary compensation transistors. The change in the compensation transistor's base current is transmitted through the amplifier circuitry to supply the change in the gain transistor's base current, rather than forcing a change in the input voltage differential to supply this current. The differential input signal is thus less sensitive to changes in the output, resulting in higher transconductance and gain. Providing a similar compensation loop for a second gain transistor through the second compensation transistor produces a circuit balance that lowers both the circuit's offset voltage, and the temperature dependence of the offset voltage.

REFERENCES:
patent: 4687984 (1987-08-01), Butler
patent: 5140280 (1992-08-01), Vyne et al.

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