LMV792MM datasheet(21/34 Pages) TI1

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10k

100k

10M

FREQUENCY (Hz)

100

110

120

130

CIN = 50 pF, CF = 1.5 pF

CIN = 100 pF, CF = 2 pF

CIN = 200 pF, CF = 3 pF

10k

100k

10M

FREQUENCY (Hz)

100

CIN = 50 pF, CF = 4.5 pF

CIN = 100 pF, CF = 6 pF

CIN = 200 pF, CF = 9 pF

IF RA < < RF

CFc = ¨

1 +

CFc

LMV791, LMV792

www.ti.com

SNOSAG6G – SEPTEMBER 2005 – REVISED OCTOBER 2015

Typical Applications (continued)

Figure 52. Obtaining Small CF from large CF′

8.2.2 Application Curves

The LMV791 was used to design a number of amplifiers with varying transimpedance gains and source

capacitances. The gains, bandwidths and feedback capacitances of the circuits created are summarized in

Table 1. The frequency responses are presented in Figure 53 and Figure 54. The feedback capacitances are

slightly different from the formula in Equation 3, because the parasitic capacitance of the board and the feedback

resistor RF had to be accounted for.

Table 1. Frequency Response Results

Transimpedance, ATI

CIN

3-dB Frequency

470000

50 pF

1.5 pF

350 kHz

470000

100 pF

2.0 pF

250 kHz

470000

200 pF

3.0 pF

150 kHz

47000

50 pF

4.5 pF

1.5 MHz

47000

100 pF

6.0 pF

1 MHz

47000

200 pF

9.0 pF

700 kHz

Figure 54. Frequency Response for ATI = 47000

Figure 53. Frequency Response for ATI = 470000

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