background image

Application Note 124

AN124-5

an124f

1 MIN

AN124 F07

TIME

AMPLITUDE

100nV

0V

Figure 7. Peak to Peak Noise Detector Output Observed Over 
6 Minutes Shows <160nV Test Circuit Noise. Resets Occur 
Every 10 seconds. 3V Battery Biases Input Capacitor, Replacing 
LTC6655 for This Test

1s/DIV

500nV/DIV

AN124 F08

Figure 8. LTC6655 0.1Hz to 10Hz Noise Measures 775nV in 
10 Second Sample Time

REFERENCES

1.  Morrison, Ralph, “Grounding and Shielding Techniques 

in Instrumentation,” Wiley-Interscience, 1986.

2.  Ott, Henry W., “Noise Reduction Techniques in Elec-

tronic Systems,” Wiley-Interscience, 1976.

3.  LSK-389 Data Sheet, Linear Integrated Systems.

4.  2SK-369 Data Sheet, Toshiba.

5.  LTC6655 Data Sheet, Linear Technology Corporation.

6.  LT1533 Data Sheet, Linear Technology Corporation.

7.  Williams, Jim, “Practical Circuitry for Measurement 

and Control Problems,” Linear Technology Corpora-
tion, Application Note 61, August 1994.

8.  Williams, Jim, “A Monolithic Switching Regulator with 

100μV Output Noise,” Linear Technology Corporation, 
Application Note 70, October 1997.

9.  Williams, Jim and Owen, Todd, “Performance Verifi ca-

tion of Low Noise, Low Dropout Regulators,” Linear 
Technology Corporation, Application Note 83, March 
2000.

10. Williams, Jim, “Low Noise Varactor Biasing with 

Switching Regulators,” Linear Technology Corporation, 
Application Note 85, August 2000, pages 4-6.

11. Williams, Jim, “Minimizing Switching Regulator Resi-

due in Linear Regulator Outputs,” Linear Technology 
Corporation, Application Note 101, July 2005.

12. Williams, Jim, “Power Conversion, Measurement 

and Pulse Circuits,” Linear Technology Corporation, 
Application Note 113, August 2007.

13. Williams, Jim, “High Voltage, Low Noise, DC-DC Con-

verters,” Linear Technology Corporation, Application 
Note 118, March 2008.

14. Tektronix, Inc., “Type 1A7 Plug-In Unit Operating and 

Service Manual,” Tektronix, Inc., 1965.

15. Tektronix, Inc., “Type 1A7A Differential Amplifi er Op-

erating and Service Manual,” Tektronix, Inc. 1968.

16. Tektronix, Inc. “Type 7A22 Differential Amplifi er Operat-

ing and Service Manual,” Tektronix, Inc., 1969.

17. Tektronix, Inc., “AM502 Differential Amplifi er Operating 

and Service Manual,” Tektronix, Inc., 1973.

Содержание AN124-775

Страница 1: ...ise often sets stable resolution limits Reference voltages have decreased with the continuing drop in system power supply voltages making reference noise increasingly important The compressed signal p...

Страница 2: ...c absorption polypro pelenecapacitorsspeci ed 3 Oscilloscopeconnectionsvia galvanically isolated links prevent ground loop induced corruption The oscilloscope input signal is supplied by an isolated p...

Страница 3: ...CTION SEE TEXT 330 F 16V 330 F 16V 330 F 16V 330 F 16V A4 LT1012 0 1 F 0 1 F 10k A 100 AND 0 1Hz TO 10Hz FILTER 1 F RST A5 1 4 LT1058 A7 1 4 LT1058 1k PEAK TO PEAK NOISE DETECTOR O TO 1V O TO 1 V PEAK...

Страница 4: ...igure 4 Pre Ampli er Rise Time Measures 10ms Indicated 35Hz Bandwidth Ensures Entire 0 1Hz to 10Hz Noise Spectrum Is Supplied to Succeeding Filter Stage 1s DIV E 20V DIV D 1V DIV C 0 5V DIV B 0 5V DIV...

Страница 5: ...100 V Output Noise Linear Technology Corporation Application Note 70 October 1997 9 Williams JimandOwen Todd PerformanceVeri ca tion of Low Noise Low Dropout Regulators Linear Technology Corporation A...

Страница 6: ...struction has low noise but is particularly susceptible to stray elds A1A also shows the socketed LTC6655 reference under test below the large input capacitor shield and the JFET input ampli er associ...

Страница 7: ...age If this is not done resultant errors can saturate the input pre ampli er or introduce noise The highest grade wet slug 200 C rated tantalum capaci tors are utilized The capacitor operates at a sma...

Страница 8: ...l directingpick uptoearthground Filter peak to peak detector oscilloscope connections are made via an isolatedprobeandapulseisolationtransformer precluding errorinducinggroundloops 1Theindicatedloop i...

Страница 9: ...ed Battery Packs Permit Positive Regulator to Supply Negative Output and Eliminate Possible AC Line Referred Ground Loops 12 Size D ALKALINE 1 5V CELLS EACH PACK LT1761 SD B FB IN OUT 18 15 0 1 F 13 7...

Страница 10: ...664 X1 1N4148 1 METAL FILM 10k 43k 5V L1 25 H 15VOUT 15VOUT OUT COMMON L2 25 H 10k 4 99k 5k 8 4 6V BATTERY 4x 1 5V ALKALINE D CELL LT1010 1 2 LT1013 1 F 47 F 0 1 F 47 F 0 1 F 10V OUT IN 19V UNREGULATE...

Страница 11: ...er Tektronix 5A22 1MHz 10 V DIV Secondary Market Requires 5000 Series Mainframe Settable Bandstops Differential Ampli er Tektronix ADA 400A 1MHz 10 V DIV Current Production Stand Alone with Optional...

Страница 12: ...4 AN124 12 an124f Linear Technology Corporation 1630 McCarthy Blvd Milpitas CA 95035 7417 408 432 1900 FAX 408 434 0507 www linear com LINEAR TECHNOLOGY CORPORATION 2009 LT 0709 PRINTED IN USA 1s DIV...

Отзывы:

Похожие инструкции для AN124-775