Wide dynamic linear amplifier circuit |
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| 申请号 | JP14206188 | 申请日 | 1988-06-09 | 公开(公告)号 | JPH01311612A | 公开(公告)日 | 1989-12-15 |
| 申请人 | Anritsu Corp; | 发明人 | NISHIMORI TOSHIFUMI; | ||||
| 摘要 | PURPOSE: To set a gain for an input signal at high speed by sending a gain switching signal to a gain switching circuit by judging the optimum gain of a linear amplifier based on the conversion output level of a logarithmic conversion circuit which converts the input signal to logarithmic relation. CONSTITUTION: The linear amplifier with the gain switching circuit is constituted of an OP amplifier (operational amplifier)10 and the gain switching circuit 11, and the input signal is sent to the linear amplifier, also to a logarithmic amplifier 12 and the logarithmic amplifier 12 outputs the input signal by converting to the logarithmic relation. A level comparison switching circuit 13 judges the level of logarithmic output by receiving the logarithmic output, and finds the optimum gain for the linear amplifier, and sends the gain switching signals (k1-kn) with the optimum gain to the switches (S1-Sn) of the gain switching circuit 11. Thereby, a wide dynamic linear amplifier circuit with high accuracy settable the gain for the input signal at high speed can be obtained. COPYRIGHT: (C)1989,JPO&Japio |
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