EVAL-PRAOPAMP-4RUZ【PDF 1/4 页】ADAPTOR BOARD QUAD AMP 14TSSOP

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AN-797

APPLICATION NOTE

ONE TECHNOLOGY WAY ? P.O. BOX 9106 ? NORWOOD, MA 02062-9106 ? TEL: 781/329-4700 ? FAX: 781/461-3113 ? WWW.ANALOG.COM

QUAD PRECISION OP AMP EVALUATION BOARD

BY GIAMPAOLO MARINO AND STEVE RANTA

? ? 1 + ( R4 / R6 ) + ( R4 / R JUMP ) / ? ?

? ? ? ? 1 + ( R JUMP1 / R5 )

? ?

( ) ? / ?

? ( 1 + R JUMP1 / R5 )

? ?

Q = ? ? ?

? ( 1 + R4 / R6 + R4 /R JUMP )

INTRODUCTION

THE EVAL-PRAOPAMP- 4R/4RU IS AN EVALUATION BOARD

WHICH ACCOMMODATES QUAD OP AMPS IN SOIC AND TSSOP

PACKAGES. IT IS MEANT TO PROVIDE THE USER WITH MULTIPLE

CHOICES AND EXTENSIVE flEXIBILITY FOR DIFFERENT APPLICA-

TIONS CIRCUITS AND CONfiGURATIONS.

THIS BOARD IS NOT INTENDED TO BE USED WITH HIGH FREQUENCY

COMPONENTS OR HIGH SPEED AMPLIfiERS. HOWEVER, IT PROVIDES

THE USER WITH MANY COMBINATIONS FOR VARIOUS CIRCUIT

TYPES INCLUDING ACTIVE fiLTERS, INSTRUMENTATION AMPLIfiERS,

COMPOSITE AMPLIfiER, AND EXTERNAL FREQUENCY COMPENSA-

TION CIRCUITS. FOR EXAMPLES OF APPLICATION CIRCUITS REFER TO

ADI AMPLIfiER DATA SHEETS UNDER THE APPLICATIONS SECTION.

THIS APPLICATION NOTE WILL PRESENT DIFFERENT IMPLEMENTA-

TIONS OF fiLTER DESIGN USING QUAD AMPLIfiERS.

STATE VARIABLE FILTER (INVERTING)

THE SV fiLTER USES TWO INTEGRATORS AND A SUMMING AMPLIfiER

TO PROVIDE SECOND-ORDER LOW-PASS, BAND-PASS, AND HIGH-

PASS RESPONSES. A FOURTH OP AMP CAN BE USED TO COMBINE

THE EXISTING RESPONSES AND SYNTHESIZE THE NOTCH OR THE

ALL-PASS RESPONSES.

THIS fiLTER CIRCUIT CAN BE EASILY CONSTRUCTED USING THE

QUAD EVAL_PRAOPAMP BOARD AND FOLLOWING THE SCHE-

MATIC IN FIGURE 1.

USING THE SUPERPOSITION PRINCIPLE, WE WRITE

? ?

V HP = ( – R6 / R4 ) V 1 – ( R4 / R JUMP ) V LP +

? ? ? ? V BP

? ?

SINCE A2 AND A3 ARE INTEGRATORS, WE HAVE:

V BP = ( – 1 / R8 C6S ) V HP AND V LP = ( – 1 / R13 C8 ) V BP

AFTER EXTENDED SIMPLIfiCATIONS WE HAVE THE FOLLOWING

EXPRESSIONS:

ω O = ( R4 / R JUMP ) / ( R8 C6 R13 C8 )

AND

R4 R8 C6 /R JUMP R13 C8

H OHP = – R4 / R6 , H OBP = ( 1 + R JUMP1 / R5 ) /

( 1 + R6 / R JUMP + R6 / R4 ) , H OLP = – R JUMP / R6

FROM THE ABOVE EXPRESSIONS WE OBSERVE THAT Q DEPENDS

ON THE RESISTOR RATIO R JUMP1 /R5 . WE THEREFORE EXPECT Q

TO BE MUCH LESS SENSITIVE TO RESISTANCE TOLERANCES AND

DRIFT. INDEED, WITH PROPER COMPONENT SELECTION AND

CIRCUIT CONSTRUCTION, THE SV fiLTER CAN EASILY YIELD DEPEND-

ABLE QS IN THE RANGE OF HUNDREDS. FOR BEST RESULTS, IT IS

ADVISABLE TO USE METAL fiLM RESISTORS AND POLYSTYRENE OR

POLYCARBONATE CAPACITORS, AND PROPERLY BYPASS THE OP

AMP SUPPLIES.

R JUMP *

–V IN A

V CC

R13

V CC

V+

V–

V HP = V OUT A

V+

V–

V BP = V OUT B

V+

V–

V LP = V OUT C

V EE

R JUMP1 *

V EE

* R JUMP AND R JUMP1 IS AN EXTERNAL COMPONENT, NOT PROVIDED ON THE APPLICATION BOARD.

FIGURE 1. STATE VARIABLE FILTER (INVERTING)

REV. 0

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