CC2

RB1

RB2

CF

CC1

V

+

AV = 1 +

R2

R1

+

-

VIN

+

-

R1

1 k:

R2

1 M:

VOUT

+

-

= 1001

0

50

100

150

200

Time (us)

Vout (1V/div)

Vin (10mV/div)

C001

17

LMV651, LMV652, LMV654

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SNOSAI7K – SEPTEMBER 2005 – REVISED MAY 2016

Product Folder Links: LMV651 LMV652 LMV654

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Typical Applications (continued)

8.2.1.3 Application Curve

Figure 38. High Gain Inverting Amplifier Results

8.2.2 High Gain, Low Power Noninverting Amplifiers

With a low supply current, low power operation, and low harmonic distortion, the LMV65x devices are ideal for

wide-bandwidth, high gain amplification. The wide unity-gain bandwidth allows these parts to provide large gain

over a wide frequency range, while driving loads as low as 2 k

Ω with less than 0.003% distortion. Figure 39 is a

noninverting amplifier with a gain of 1001, can provide that gain with a

−3-dB bandwidth of 12 kHz, for a similar

low quiescent power dissipation. With the LMV65x, these circuits can provide gain of

−100 with a −3-dB

bandwidth of 120 kHz, for a quiescent current as low as 116

μA. Coupling capacitors CC1 and CC2 can be added

to isolate the circuit from DC voltages, while RB1 and RB2 provide DC biasing. A feedback capacitor CF can also

be added to improve compensation.

Figure 39. High Gain Noninverting Amplifier

8.2.3 Active Filters

With a wide unity-gain bandwidth of 12 MHz, low input-referred noise density, and a low power supply current,

the LMV65x devices are well suited for low-power filtering applications. Active filter topologies, like the Sallen-

Key low-pass filter shown in Figure 40, are very versatile, and can be used to design a wide variety of filters

(Chebyshev, Butterworth, or Bessel). The Sallen-Key topology, in particular, can be used to attain a wide range

of Q, by using positive feedback to reject the undesired frequency range.