OPA607 datasheet(31/52 Pages) TI2

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GBWP

R C

(10)

Equation 10 estimates a closed-loop bandwidth of 2.19 MHz. Figure 8-13 and Figure 8-14 show the loop-gain

magnitude and phase plots from the TINA-TI simulations of the transimpedance amplifier circuit of Figure 8-12.

The 1/β gain curve has a zero from RF and CIN at 70 kHz and a pole from RF and CF canceling the 1/β

zero at 1.5 MHz, resulting in a 20-dB per decade rate-of-closure at the loop-gain crossover frequency (the

frequency where AOL equals 1/β), providing a stable circuit. A phase margin of 62° is obtained with a closed-loop

bandwidth of 3 MHz and a 100-kΩ transimpedance gain.

8.2.1.3 Application Curves

Frequency (Hz)

-10

100

110

120

100

10k

100k

10M

100M

D804

AOL

1/E

AOLE

Figure 8-13. Loop-Gain Magnitude vs Frequency

for the Transimpedance Amplifier Circuit of Figure

8-12

Frequency (Hz)

100

10k

100k

10M

100M

D805

AOL

1/E

AOLE

Figure 8-14. Loop-Gain Phase vs Frequency for the

Transimpedance Amplifier Circuit of Figure 8-12

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OPA810

SBOS799E – AUGUST 2019 – REVISED AUGUST 2024

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