| 摘要 |
The present invention relates to a variable gain amplifier. The variable gain amplifier in an ultrasound includes an attenuator. The attenuator includes resistor strings each having a plurality of resistors connected in series to each other and a gain control unit. The gain control unit has tap inputs taken from a plurality of junctions between a first resistor string receiving a first input signal and a second resistor string receiving a second input signal. The gain control unit is configured to provide an attenuated differential input signal based on the tap inputs. The variable gain amplifier includes an amplifying unit having a feedback amplifying section configured to amplify the attenuated differential input signal to output a first amplified signal and a clipping amplifying section configured to amplify the first amplified signal to output a second amplified signal that falls within a predetermined voltage range.
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