| 摘要 |
PROBLEM TO BE SOLVED: To provide a novel balanced amplifier available for a power amplifier comprising a vacuum valve for characteristic enhancement. SOLUTION: A balanced amplifier includes a first stage which is connected with a second stage and outputs signals to the second stage, and the first stage includes a first differential amplifier which receives a balanced input signal and comprises two sets of feedback loops. At least one set of feedback loops feeds part of signals output from the second stage back to the first differential amplifier. The second stage includes a second differential amplifier for amplifying signals received from the first stage and holds the balanced signal. COPYRIGHT: (C)2007,JPO&INPIT
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