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A Variable-Gain Amplifier Employing First-Quadrant Multiplier/Dividers
Takeshi YAMAKAWA Fumio UENO
IEICE TRANSACTIONS (1976-1990)
Publication Date: 1984/02/25
Print ISSN: 0000-0000
Type of Manuscript: LETTER
Category: Electronic Circuits
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A new type of variable-gain amplifier employing two first-quadrant multiplier/dividers is discussed. It has many distinctive features, such as 1) no change in input and output impedances, when gain is changed, 2) good linearity insensitive to the area-mismatch of transistors, 3) zero ouput offset independent of ambient temperature and gain, 4) large gain-bandwidth product, 5) simple circuit configuration.