Design Note Glen Brisebois LT®1677 LT1884 latest results Linear T

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Design Note Glen Brisebois LT®1677 LT1884 latest results Linear T

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Rail-to-Rail Amplifiers Operate 2.7V with 20µV Offset
Design Note Glen Brisebois
LT®1677 LT1884 latest results Linear Technology's quest "ideal" Amp1. Both them will operate with supplies down 2.7V, have only 20µV input offset voltage have rail-to-rail outputs. LT1677 features very noise, 3.2nV/Hz; LT1884 features very 150pA input bias current. Each application circuits shown below take advantage some particular subset features these amplifiers. Remote 2-Wire Geophone Preamp Using Noise LT1677 LT1677 optimized lowest overall noise when looking into transducers 2700 impedance, such Geophone shown Figure noise amplifier desired this application because seismic signals that must resolved, whether natural made, extremely small require high gain. complicate matters, Geophones often buried order avoid interference from traffic other surface effects often necessarily remote. circuit Figure applies gain ~100 Geophone signal transmits this back operator modulating supply current. LT1635 configured stable current source 5mA. This then powers LT1677 well another LT1635, this time configured shunt regulator. Resistors bias voltage 1.85V, centering output swing offset keeping LT1677 input common
1Not
only would ideal have zero noise, zero input offset, parasitic capacitances, infinite gain bandwidth supply power, would this free. registered trademarks Linear Technology Corporation.
IMPOSSIBLE MIS-WIRE LOCAL
0.01µF 47µF 261k 422k 0.1µF GEOSPACE CORP GEOPHONE MODEL 20DX 630, 10Hz (713) 939-7093 2N3904 REMOTE SUPPLY 150k 1000pF
SHUNT REGULATOR
Figure Remote 2-Wire Geophone Preamp
04/00/230
LT1635
CURRENT SOURCE
LT1635
43.2 2N3904 1N4148 2200pF
LT1677
2N3906
circuit operates current loop good interference immunity, with interference appearing across rather than across R12. temperature compensates causes boost gain below 10Hz where geophone response falling off. limits bandwidth 1kHz. through form bridge rectifier that local wiring arbitrary. LT1677 could drive directly, used output buffer that heavy currents into LT1677's high open-loop gain. Difference Amplifier Using LT1884: ±42V Input Range Single Supply Without Sacrificing Differential Gain Measuring small voltages large voltages quite difficult. Often, standard difference amplifier topology implemented with very high value input resistors value divide feedback resistors, shown Figure However, this results significant differential mode attenuation.
Figure Standard Difference Amplifier Handle High Voltage Inputs, Cost Differential Gain
circuit Figure uses LT1884 achieve high common mode input range rejection without sacrificing differential gain. samples common mode through nulls through R3-R1 ratio must extremely well matched R4-R2 ratio avoid causing common mode differential mode translation this point. Once common mode nulled, then differential mode input voltage converted differential input current appears unattenuated across common mode input voltage theoretically high about 250V (limited output going ground ÷100 ratio maintaining common mode 2.5V), limited fact working voltage ratio matching R1-R3 R2-R4.
2Note
that LT1677 rail-to-rail inputs.
42VP-P ±2.5V
LT1884
CADDOCK (541) 496-0700 T912 0.01% MATCHED RESISTOR PAIRS
METAL FILM
Figure Single Supply Difference Amplifier. Nulls Common Mode That Concentrate Difference Mode
Data Sheet Download
literature Amps, call 1-800-4-LINEAR. applications help, call (408) 432-1900, Ext. 2156
dn230f LT/TP 0400 340K PRINTED
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417
(408)432-1900 FAX: (408) 434-0507 www.linear-tech.com
VOUT 2.5V ±VDM LT1884
DN230
DN230
mode most precise range2. This places about 1.15V across thereby pulling additional from main supply through this that will modulated signal. total current about 12mA puts across receiver resistor, with allowing peak signal ±1.5V about bias point.
LT1634B-2.5
LINEAR TECHNOLOGY CORPORATION 2000

Design Note Glen Brisebois LT®1677 LT1884 latest results Linear T

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