Transformer_coupled_amplifier

Published:2009/7/24 20:56:00 Author:Jessie | From:SeekIC

Figure 5-19 shows another way to get high common-mode rejection, together with true 3-port isolation. The input, gain stage, and output are all galvanically isolated from each other. As such, this circuit is useful where large common-mode differences are encountered or where ground integrity is uncertain. With the values shown, A1 has a gain of 11. T1 feeds the A1 input, and the output is taken from T2.Figure 5-20 shows results for a 4-MHz input, with all of the polarity dots referred to ground. The input (trace A, Fig. 5-20) is applied to T1. The output of T1 (trace B) feeds A1. A1 produces gain, and the A1 output (trace C) feeds T2. The T2 output (trace D) is the circuit output. Using the specified transformers, the low-frequency cutoff is about 10 kHz. LINEAR TECHNOLOGY, APPLICATION



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