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Operational amplifier voltage follower

Fig. 5.43 Voltage control circuit with the aid of an operational amplifier (a) and a circuit of potentiostat (b). VF voltage follower CF current follower. Fig. 5.43 Voltage control circuit with the aid of an operational amplifier (a) and a circuit of potentiostat (b). VF voltage follower CF current follower.
Real operational amplifier (compliance limitations, offset current and voltage) Voltage follower Follower with gain Inverter Integrator Differentiator Comparators... [Pg.173]

Potentiostat with three operational amplifiers A (adder control), B (voltage follower), and C (current follower). Adapted from Skoog et al. [56],... [Pg.741]

Figure 21 F-7 (a) A voltage-follower operational amplifier, (b) Typical arrangement for potentiometric measurements with a... Figure 21 F-7 (a) A voltage-follower operational amplifier, (b) Typical arrangement for potentiometric measurements with a...
Figure 15.13 Schematic of an operational amplifier (called an op-amp) with voltage feedback (the voltage follower). Figure 15.13 Schematic of an operational amplifier (called an op-amp) with voltage feedback (the voltage follower).
The frequency range of an active cnnent-to-voltage converter is limited mainly by the gain and phase performance of the operational amplifier, which falls off at high ffeqnencies. An analysis of this effect (T. Goldrick [1982], unpublished) shows that, for certain simplifying assnmptions, the apparent impedance Zi. is related to the standard and unknown as follows ... [Pg.229]

Fig. 4. Impedance converters for measuring e.m.f. of a cell, (A) using a voltage follower (the effective input resistance, equals the common mode resistance of an FET-type operational amplifier), (B) using voltage feedback (Reff R-Ao, where R is the input resistance, Aq is the OA gain without feedback), (C) by means of an instrumentation amplifier (typical differential gain A = 1 + lO /Re t)- Abbreviations OA, operational amplifier AZ OA, automatically zeroed OA lA, instrumentation amplifier S, shielding. Fig. 4. Impedance converters for measuring e.m.f. of a cell, (A) using a voltage follower (the effective input resistance, equals the common mode resistance of an FET-type operational amplifier), (B) using voltage feedback (Reff R-Ao, where R is the input resistance, Aq is the OA gain without feedback), (C) by means of an instrumentation amplifier (typical differential gain A = 1 + lO /Re t)- Abbreviations OA, operational amplifier AZ OA, automatically zeroed OA lA, instrumentation amplifier S, shielding.
The disadvantage following from output signal dependence on the MOSFET characteristics is overcome in the circuit depicted in Fig. 7C (constant charge method). The negative voltage feedback of an operational amplifier is used here to compensate a source-potential (Ug) drift. The value of Ur is controlled to obtain a constant value of Ug (here 0 V) and consequently constant values of Uos Id = Uds/Rs ... [Pg.378]

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See also in sourсe #XX -- [ Pg.62 ]



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