Radio terminal device
A level of a base band signal at an input side of a variable gain amplification circuit 8 is detected by a logarithmic amplifier 11 having a wide input voltage range at a start of an operation, a control unit 13 then performs a coarse feedforward control on a gain of the variable gain amplifier 8 ba...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | A level of a base band signal at an input side of a variable gain amplification circuit 8 is detected by a logarithmic amplifier 11 having a wide input voltage range at a start of an operation, a control unit 13 then performs a coarse feedforward control on a gain of the variable gain amplifier 8 based on the detected level and finds a level of an output of an A/D converter 10 by a mean square deriving circuit 14 and inputs the resulting signal to the control unit 13. Then the control unit 13 performs a fine feedback control on the variable gain amplifier 8 based on the detected level. |
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