ADA4661-2ARMZ-R7 datasheet(27/32 Pages) AD

27 / 32 page

Data Sheet

ADA4661-2

Rev. 0 | Page 27 of 32

Figure 84. Frequency Response of Compensation Scheme

Figure 85 shows the output response of the unity-gain amplifier

driving 250 pF of capacitive load. With no compensation, the

amplifier is unstable. Figure 86 to Figure 88 show the amplifier

output response with 210 Ω, 301 Ω, and 750 Ω of RISO compensa-

tion. Note that with lower RISO values, ringing is still noticeable,

whereas with higher RISO values, higher frequency signals are

filtered out.

Figure 85. Output Response with No Compensation (RISO = 0 Ω)

Figure 86. Output Response (RISO = 210 Ω)

Figure 87. Output Response (RISO = 301 Ω)

Figure 88. Output Response (RISO = 750 Ω)

10k

100k

10M

RISO = 0Ω

RISO = 210Ω

RISO = 301Ω

RISO = 499Ω

FREQUENCY (Hz)

–10

–20

–30

–40

–50

TIME (10µs/DIV)

VSY = ±9V

VIN = 100mV p-p

AV = 1

CL = 250pF

RISO = 0Ω

TIME (10µs/DIV)

VSY = ±9V

VIN = 100mV p-p

AV = 1

CL = 250pF

RISO = 210Ω

TIME (10µs/DIV)

VSY = ±9V

VIN = 100mV p-p

AV = 1

CL = 250pF

RISO = 301Ω

TIME (10µs/DIV)

VSY = ±9V

VIN = 100mV p-p

AV = 1

CL = 250pF

RISO = 750Ω

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