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5962-9313001MPA Datasheet(PDF) 8 Page - Analog Devices |
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5962-9313001MPA Datasheet(HTML) 8 Page - Analog Devices |
8 / 16 page AD830 REV. A –8– TRADITIONAL DIFFERENTIAL AMPLIFICATION In the past, when differential amplification was needed to reject common-mode signals superimposed with a desired signal; most often the solution used was the classic op amp based difference amplifier shown in Figure 19. The basic function VO = V1–V2 is simply achieved, but the overall performance is poor and the cir- cuit possesses many serious problems that make it difficult to re- alize a robust design with moderate to high levels of performance. R1 R2 R3 R4 VOUT V2 V1 ONLY IF R 1 = R2 = R3 = R4 DOES VOUT = V1 – V2 Figure 19. Op Amp Based Difference Amplifier PROBLEMS WITH THE OP AMP BASED APPROACH • Low Common-Mode Rejection Ratio (CMRR) • Low Impedance Inputs • CMRR Highly Sensitive to the Value of Source R • Different Input Impedance for the + and – Input • Poor High Frequency CMRR • Requires Very Highly Matched Resistors R1–R4 to Achieve High CMRR • Halves the Bandwidth of the Op Amp • High Power Dissipation in the Resistors for Large Common- Mode Voltage AD830 FOR DIFFERENTIAL AMPLIFICATION The AD830 amplifier was specifically developed to solve the listed problems with the discrete difference amplifier approach. Its topology, discussed in detail in a later section, by design acts as a difference amplifier. The circuit of Figure 20 shows how simply the AD830 is configured to produce the difference of two signals V1 and V2, in which the applied differential signal is exactly reproduced at the output relative to a separate output common. Any common-mode voltage present at the input is removed by the AD830. A=1 V → I V → I VOUT V2 V1 VOUT = V1 – V2 IY IX Figure 20. AD830 as a Difference Amplifier ADVANTAGEOUS PROPERTIES OF THE AD830 • High Common-Mode Rejection Ratio (CMRR) • High Impedance Inputs • Symmetrical Dynamic Response for +1 and –1 Gain • Low Sensitivity to the Value of Source R • Equal Input Impedance for the + and – Input • Excellent High Frequency CMRR • No Halving of the Bandwidth • Constant Power Distortion vs. Common-Mode Voltage • Highly Matched Resistors Not Needed |
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