Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1984-10-01
1986-03-04
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including gain control means
328145, H03G 320, G06G 724
Patent
active
045742510
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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IEEE Journal of Solid-State Circuits, vol. SC-16, No. 6, Dec. 1981, Article entitled "A Volume and Tone Control IC for Hi-Fi Audio" by Maki Sato, Kazuo Suzuki, Tadao Suzuki, and Kinya Akutsu, pp. 682-689.
Berry Thomas G.
Motorola Inc.
Mullins James B.
Southard Donald B.
Wan G.
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