multistage amplifier circuit

Published:2011/5/30 2:16:00 Author:Christina | Keyword: multistage, amplifier circuit | From:SeekIC

1. Coupling modes of the multistage amplifier circuit In practice we always use three kinds of coupling modes: the resistance capacitance coupling, the direct coupling and the transformer coupling. (1). Resistance capacitance coupling It's connection method: connect the preamplifier output to the rear-amplifier output through the resistance and the capacitance. It's features: the quiescent operating points of the stages are independent and easy to adjust. It's weak point: can not amplify and change the slow signal and do not easy to integrate. The figure 1 shows the resistance capacitance coupling connection. (2). Direct coupling In order to avoid the influence of the capacitance to the slowly changing signal, we connect the two stages of amplifier circuits together, this is the direct coupling. It's features: it can amplify the AC signal and the DC signal, easy to integrate, but it has the zero drift phenomenon. Figure: multistage amplifier circuit



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