OPA607 datasheet(27/50 Pages) TI1

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Frequency (Hz)

-20

-10

100

110

120

100

10k

100k

10M

100M

D801

RF = 200 :, RG = 50 :

RF = 10 k:, RG = 2.5 k:

RF = 1 M:, RG = 250 k:

Frequency (Hz)

100

10k

100k

10M

100M

D802

RF = 200 :, RG = 50 :

RF = 10 k:, RG = 2.5 k:

RF = 1 M:, RG = 250 k:

2 R C

DIFF

PCB

CDIFF

VIN

VREF

VSIG

VREF

-(RF/RG)VSIG

VS+

VS-

CCM

CPCB

OPA810

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SBOS799A – AUGUST 2019 – REVISED DECEMBER 2019

Product Folder Links: OPA810

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Application Information (continued)

Figure 66. Inverting Amplifier with Input Capacitors

The effective capacitance at the amplifier inverting input pin is shown in Equation 5, which forms a pole in β at a

cut-off frequency of Equation 6.

where

•

CCM is the amplifier common-mode input capacitance

•

CDIFF is the amplifier differential input capacitance

•

CPCB is the PCB parasitic capacitance

(5)

(6)

For low-power systems, greater the values of the feedback resistors, the earlier in frequency does the phase

margin begin to reduce and cause instability. Figure 67 and Figure 68 illustrate the loop gain magnitude and

phase plots, respectively, for the OPA810 simulation in TINA-TI configured as an inverting amplifier with values

of feedback resistors varying by orders of magnitudes.

Figure 67. Loop-Gain vs Frequency for Circuit of Figure 66

Figure 68. Loop-Gain Phase vs Frequency for Circuit of

Figure 66

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