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Transconductance amplifier having a digitally variable transconductance as well as a variable gain stage and an automatic gain control circuit comprising such a variable gain stage
Transconductance amplifier having a digitally variable transconductance as well as a variable gain stage and an automatic gain control circuit comprising such a variable gain stage
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机译:具有数字可变跨导以及可变增益级的跨导放大器和包括这种可变增益级的自动增益控制电路
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摘要
A transconductance amplifier having a digitally variable transconductance includes a differential stage having a first differential output coupled to an output terminal via a first current mirror and a second differential output coupled to the output terminal via a second and third current mirror. The first and third current mirrors have multiple output branches for selectively supplying output currents to the output terminal in response to a binary transconductance control signal. In this way a digital control of the variable transconductance is realised, which can be used advantageously in a variable gain stage and in an automatic gain control circuit including such a variable gain stage.
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