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National Semiconductor

1959 National Semiconductor . , , , . (), , .

. - , , , , , , (+), (-) . , Voltage Feedback Amplifier (VFA - ), . 1.

1. VFA () CFA ()

         VFA ()     CFA ().

- A = Vo/Vd, Vo - ; Vd - . , " " . , VFA , , Vd.

VFA (), . 2.

2.

     .

Vo, ,

(Vi Vd)/R1 = [Vo (Vi Vd)]/R2. (1)

Vd A,

Av = Vo/Vi = G/(1 + G/A), (2)

G = 1 + R2/R1. A >> G (2) Av = 1 + R2/R1.

VFA , , - -20 . , - RC-, . - () , . 3, (2) . , Av VFA , f1 (Gain Bandwidth) - , Av = 1.

3. VFA () CFA ()

    VFA ()  CFA ()      .

- (Slew Rate) , . 4. I, , VFA I/C.

4. VFA () CFA ()

        VFA ()  CFA ().

Current Feedback Amplifier (CFA - ). National Semiconductor 80- . CFA , . CFA . 1 1 , , " " Z = Vo/In, Transimpedance. CFA (. 2), In, . R2, , , . , CFA , VFA, : VFA Vd, CFA - In.

CFA () , VFA, . 2.

In = (Vi Vo)/R2 + Vi/R1 . (3)

In Z,

Av = Vo/Vi = G/(1 + R2/Z). (4)

Z >> R2 (4) Av = 1 + R2/R1. Z , VFA, , ( ) R1 R2 , , , . 3. , CFA , VFA.

CFA , VFA Ceq (. 4). Iz , .

, CFA R1 R2 , , , . CFA, VFA, , , , CFA . National Semiconductor ViPTM 10 ViPTM 11. , , , CFA .

CFA . 5 - - Av = 2 National Semiconductor LMH6715 R2. , 200 700 . , , 300 , -1 300 . . 6 R2 Av. R1 Av = 1 + R2/R1.

5. Av = 2 National Semiconductor LM6715 R2

         Av = 2    National Semiconductor LM6715       R2.

6. R2 National Semiconductor LM6715

       R2           National Semiconductor LM6715.

National Semiconductor . . , 640x480 60 107 / 27 , , 1600x1200 85 950 / 240 . " " (Differential Gain - DG) " " (Differential Phase - DP), NTSC PAL. . . National Semiconductor DG DP, .

National Semiconductor . . 7 CFA LMH6714. 50 . VFA, , LMH6609.

7. C LMH6714

C      LMH6714.

National Semiconductor. , . 8 (BW) (SR) . BW 1,5 LMH6624, SR 4100 / LM7171. , VFA, CFA LMH67xx BW SR, VFA.

8. (BW) (SR) National Semiconductor

    (BW)      (SR)       National Semiconductor.

LMH6622 A 2 . 1,6 1,5 ( 2- -90 ).

1500 LMH6624 (c LMH6624 - 1300 ). 10 , 0,1 0,1 /, . , . - 5 15 .

LMH6628, 2/3- 10 -65/-74 , , 0,1% - 12 . /.

LMH6672 600 . 2 , 130 160 /. , . SOIC, PSOP LLP. , .

LMH6642/3/4 (//) - VFA Rail to Rail . - 2,7 , - 130 , - 130 /, - 115 . 68 , , , .

(190 , 170 /) Rail to Rail LMH6639 190 . (Shutdown) 85 , 400 . 33 , , , CD ROM ..

LMH6654/5 (/) . 4,5 , 250 , - 200 /, - 180 . 4,5 1,7 , 25 , , . SOIC-8, SOT23-5 (LMH6654) MSOP-8 (LMH6655).

LMH6657/8 LMH6682/3 - 3 12 . VIPTM 10. LMH6657/8 (/) , 270 700 /. - 6,2 , - +80/-90 . .

LMH6682/3 (/) 940 / 190 . CD/DVD, , . , LMH6657/8, " " - 0,08o " " - 0,01%, .

1000 /. LM LM6171/2 LM6181/2 (/), VIPTM 11. VFA 2,5 3600 / 100 . LM6181/2 CFA 10 100 . 2000 / 100 . 130 " " " " NTSC PAL, , ..

LMH6609 . 900 1400 /, 10 7 . , 3,1 / 90 . 8- SOIC 5- SOT.

LM7121, SOT23-5. : - 175 , - 1300 /. +5 , 5 15 . LM7171 () LM7372 (). VFA, , (CFA) - 4100 /, 200 , 100 (LM7171) 3000 /, 120 , 150 , , LM7372 6,5 . 2. " " 0,01% 0,02o, , , .

LMH67xx VIPTM 10 CFA . LMH6702 - ( , 1,83 ) (-100 5 ) , 720 3100 /. LMH6702 - .

LMH6714/15/20/22 (// /) 400 2 1800 / 5,6 , , . LMH6720, 7 TTL-, . LMH6722 .

4,5 12 LMH6723 ( 1 ) 370 , 600 / 110 , , , CD-DVD ..

LMH6732 0 1,5 . , 10 , 1 . : - 55 , - 400 /, - 9 1 540 , 2700 / 115 , , 9 . - 9 12 . - , , .. , LMH6732 National Semiconductor .

National Semiconductor . http://www.national.com.

.      National Semiconductor .

  1. .., .. . " ". 2001. . 318325.
  2. The Art of Analog. 2003. Linear Applications Seminar. National Semiconductor. 2003. P. 1-39 1-53.





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21/09/2018 18:19:06

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