Multistage cascade/cascode limiting IF amplifier and meter circu

Details Multistage cascade/cascode limiting IF amplifier and meter circu Multistage cascade/cascode limiting IF amplifier and meter circu

1982-03-26

1984-01-31

Mullins, James B.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

330252, 330257, 330259, 330311, 330 2, H04B 126, H03F 345

Patent

active

044294166

ABSTRACT:
A plurality of differential amplifier stages in cascaded in a directly coupled configuration to provide substantial signal gain. The first few stages are cascode coupled to a plural input differential signal combiner which has a single differential output that feeds a full wave differential peak detector. The peak detector therefore has an output that rises as a log function of the signal input. This signal-related voltage is then fed to a differential dc amplifier which in turn drives a meter that indicates the log of the input signal strength. The amplifier cascade is stabilized by a dc feedback loop.

REFERENCES:
patent: 4247949 (1981-01-01), Watanabe et al.

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