Logarithmic digitally variable gain controlled amplifier

Details Logarithmic digitally variable gain controlled amplifier Logarithmic digitally variable gain controlled amplifier

H - Electricity

03

G

330/31, 330/39

H03G 3/20 (2006.01) H03G 1/00 (2006.01) H03G 3/00 (2006.01)

Patent

CA 1209651

LOGARITHMIC DIGITALLY VARIABLE GAIN CONTROLLED AMPLIFIER Abstract An integratable amplifier circuit is provided including a current generator section, a digital control section and a variable gain amplifier section. The integratable amplifier circuit is compatible with the bipolar process and can be included on an integrated circuit, such as one performing receiver and audio functions. The current generator section produces a biasing current which is applied to a digital control section which divides the biasing current according to a binary input signal to produce a control current equal to a predetermined fraction of the biasing current, corresponding to a predetermined logarithmic attenuation. The control current is applied to a control input of the variable gain amplifier section to vary the gain thereof in logarithmic steps.

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