A true i.f. logarithmic amplifier using twin-gain stages
作者:
A.Woroncow,
J.Croney,
期刊:
Radio and Electronic Engineer
(IET Available online 1966)
卷期:
Volume 32,
issue 3
页码: 149-155
年代: 1966
DOI:10.1049/ree.1966.0068
出版商: IERE
数据来源: IET
摘要:
A true i.f. logarithmic amplifier is described which avoids the successive detection principle and its associated video delay line. Each stage comprises a pair of long-tailed pairs in a complementary role. Transistors are used throughout but ‘bottoming’ is avoided, and bandwidth variations are negligible. A dynamic range of about 100 dB is possible. A video output may be derived if desired from a single detector after the last stage, but when an output at i.f. is taken, phase variations with amplitude may be of interest, and have been investigated. A technique for correcting such phase variations is described, and a development of the basic amplifier circuit is given which should minimize such phase variations at their source.
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