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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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AD8045ACPZ-R2 Datenblatt(PDF) 19 Page - Analog Devices |
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AD8045ACPZ-R2 Datenblatt(HTML) 19 Page - Analog Devices |
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19 / 26 page  Data Sheet AD8045 Rev. B | Page 17 of 24 THEORY OF OPERATION The AD8045 is a high speed voltage feedback amplifier fabricated on the Analog Devices second generation extra fast complementary bipolar (XFCB) process. An H-bridge input stage is used to attain a 1400 V/µs slew rate and low distortion in addition to a low 3 nV/√Hz input voltage noise. Supply current and offset voltage are laser trimmed for optimum performance. FREQUENCY RESPONSE The open-loop response of the AD8045 over the frequency can be approximated by the integrator response shown in Figure 63. fCROSSOVER = 400MHz FREQUENCY (MHz) 0 1 10 100 f 1000 VOUT/VIN = fCROSSOVER VIN VOUT Figure 63. Open-Loop Response The closed-loop transfer function for the noninverting configuration is shown in Figure 64 and is written as ( ) G CROSSOVER G F F G CROSSOVER IN OUT R f R R R R f V V × × + + + × × = π 2 s ) ( π 2 where: s is (2 πj)f. fCROSSOVER is the frequency where the open-loop gain of the amplifier equals 1 (0 dB). DC gain is therefore ( ) G F G IN OUT R R R V V + = Closed-loop −3 dB bandwidth equals ( ) F G G CROSSOVER IN OUT R R R f V V + × = The closed-loop bandwidth is inversely proportional to the noise gain of the op amp circuit, (RF + RG)/RG. This simple model can be used to predict the −3 dB bandwidth for noise gains above +2. The actual bandwidth of circuits with noise gains at or below +2 is higher due to the influence of other poles present in the real op amp. RG RF VIN VOUT RS + – Figure 64. Noninverting Configuration DC ERRORS Figure 65 shows the dc error contributions. The total output error voltage is + + + + − = − + G F G OS F B G F G S B (ERROR) OUT R R R V R I R R R R I V RG RF VOS VOUT RS + – IB+ IB– Figure 65. Amplifier DC Errors The voltage error due to IB+ and IB− is minimized if RS = RF||RG. To include the effects of common-mode and power supply rejection, model VOS as CMR V PSR V V V CM S OS OS nom ∆ + ∆ + = where: nom os V is the offset voltage at nominal conditions. ΔVS is the change in the power supply voltage from nominal conditions. PSR is the power supply rejection. CMR is the common-mode rejection. ΔVCM is the change in common-mode voltage from nominal conditions. |
Ähnliche Teilenummer - AD8045ACPZ-R2 |
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Ähnliche Beschreibung - AD8045ACPZ-R2 |
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