A tiny, high-speed, wide-band, voltage-feedback amplifier stable with all capacitive load

Author

Moraveji, Farhood

Author_Institution

Nat. Semicond. Corp., Santa Clara, CA, USA

Volume

31

Issue

10

fYear

1996

fDate

10/1/1996 12:00:00 AM

Firstpage

1511

Lastpage

1516

Abstract

A tiny, high-speed, wide-band, voltage-feedback operational amplifier capable of driving unlimited capacitive load is described. A class AB input stage is combined with a modified dynamic Witch-Hazel current mirror to provide high slew rate and wide bandwidth with a small die area and small idle current. An RC network couples part of the capacitive load into the high-impedance node, therefore lowering the dominant pole and increasing stability as a function of capacitive load. The part was fabricated on a 3 GHz, 40 V complementary bipolar process. The quiescent current of the chip is 4.5 mA with 1500 V/μm slew rate and a -3 dB bandwidth of 235 MHz. The part is operational from ±2.5 V to ±18 V supply range. Die size is 38 mils by 46 mils and it fits into a tiny surface outline transistor (SOT) package

Keywords

RC circuits; circuit stability; feedback amplifiers; integrated circuit design; integrated circuit packaging; operational amplifiers; wideband amplifiers; -18 to 18 V; 235 MHz; 3 GHz; 38 mil; 4.5 mA; 40 V; 46 mil; RC network; all capacitive load; capacitive load; class AB input stage; die area; high-impedance node; high-speed amplifier; idle current; modified dynamic Witch-Hazel current mirror; operational amplifier; quiescent current; slew rate; stability; surface outline transistor package; unlimited capacitive load; voltage-feedback amplifier; wideband amplifier; Bandwidth; Broadband amplifiers; Circuits; Mirrors; Operational amplifiers; Packaging; Resistors; Stability; Thermal resistance; Voltage;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.540063

Filename

540063