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发表于 2013-8-21 18:56:58
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IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 44, NO. 9, SEPTEMBER 2009 2535
The Recycling Folded Cascode: A General
Enhancement of the Folded Cascode Amplifier
Rida S. Assaad, Student Member, IEEE, and Jose Silva-Martinez, Senior Member, IEEE
Abstract—A recycling amplifier architecture based on the folded
cascode transconductance amplifier is described. The proposed
amplifier delivers an appreciably enhanced performance over that
of the conventional folded. This is achieved by using previously idle
devices in the signal path, which results in an enhanced transconductance,
gain, and slew rate. Moreover, the input referred noise
and offset analyses are included to demonstrate that the proposed
modifications have no adverse effects on these design metrics.
Transistor-level simulations and experimental results in TSMC
0.18 m CMOS process confirm the theoretical results. When
compared to the conventional folded cascode, and for the same
area and power budgets, the proposed amplifier has almost twice
the bandwidth (134.2 MHz versus 70.7 MHz) and better than
twice the slew rate (94.1 V s versus 42.1 V s) while driving the
same 5.6 pF load. Also a gain enhancement of 7.6 dB is observed.
Index Terms—Amplifiers, CMOS analog integrated circuits, fast
operational amplifiers, low-power low-voltage integrated circuits,
operational amplifiers, operational transconductance amplifiers. |
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