LINEARIZER FOR AUTOMATIC DIGITAL GAIN CONTROL AND AUTOMATIC DIGITAL GAIN CONTROL CIRCUIT USING THE SAME
PROBLEM TO BE SOLVED: To obtain a linearizer for automatic digital gain control which has highly accurate linearity over a wide dynamic range and is easily integrated. SOLUTION: Two pieces of data to represent transmission characteristics are outputted from a characteristic ROM 101 according to the...
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Zusammenfassung: | PROBLEM TO BE SOLVED: To obtain a linearizer for automatic digital gain control which has highly accurate linearity over a wide dynamic range and is easily integrated. SOLUTION: Two pieces of data to represent transmission characteristics are outputted from a characteristic ROM 101 according to the values of plural upper bits constituting digital data to be inputted, are held in latch circuits 107, 108 and an average between both pieces of the outputted data of the latch circuits is calculated by an adder 109 and 1/2 circuit 110. This calculation result is inputted in selectors 111 and 112 for feedback. Outputs of the latch circuits 107 and 108 are connected with the other input of the selectors and feed back is performed by successively switching a control signal for selection in the selectors, i.e., data to be inputted in a selector 104. |
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