LT1351 datasheet(16/20 Pages) LINER

16 / 20 page

LT6274/LT6275

6275fa

For more information www.linear.com/LT6275

TYPICAL APPLICATIONS

Pulse Response

Figure 5 shows the output step response of the composite

amplifier (measured at the output of the LT6275) at many

different amplitudes. At 15V output excursion, the initial

slope is measured to be 725V/μs. This slope is faster than

the 390V/μs measured with a 15V output excursion using

the simple noninverting amplifier of Figure 1. According

to Equation (3), this improvement has been made pos-

sible because the effective bandwidth of the composite

amplifier is higher (and thus has a lower τo), as intended.

Sine Waves

The composite amplifier of Figure 3 was also tested with

sine waves. Figure 6 shows the small signal closed-loop

gain and phase response. Distortion was also evaluated

for this circuit: for a 20VP-P output signal at 1MHz, HD2/

HD3 were measured to be –55dBc/–47dBc, respectively.

These numbers are more impressive when consider-

ing the very low power dissipation of the composite

amplifier, as illustrated in Figure 7. For example, for the

20VP-P/1MHz output condition mentioned above, the 5V

rail supply current is 3.75mA, for 1/2 LT6275 the ±15V

rails supply current is 2.2mA, resulting in a total power

dissipation of 85mW.

8pF

5pF

3pF

1pF

NO CAP

250ns/DIV

–10

–8

–6

–4

–2

6275 TA09

Figure 4. Composite Amplifier Step Response

vs LTC6252 Feedback Capacitance (AV = –11V/V)

Figure 5. Composite Amplifier Step Response at

Various Output Step Amplitudes (AV = –11V/V)

200ns/DIV

–15

–12

–9

–6

–3

6275 TA12

GAIN

PHASE

FREQUENCY (MHz)

0.1

100

–25

–20

–15

–10

–5

–225

–180

–135

–90

–45

135

180

225

6275 TA14

USING 1/2 LT6275

OUTPUT = 20VP–P

5V SUPPLY CURRENT

±15V SUPPLY CURRENT

TOTAL POWER

FREQUENCY (MHz)

0.5

1.5

120

150

6275 TA15

Figure 6. Composite Amplifier Closed-Loop

Gain/Phase vs Frequency

Figure 7. Composite Amplifier Supply

Current and Total Power Dissipation

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