Squaring circuit and electronic device using same

Details Squaring circuit and electronic device using same Squaring circuit and electronic device using same

2000-05-30

2004-06-22

Urban, Edward F. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S234100, C455S232100, C375S345000

Reexamination Certificate

active

06754479

ABSTRACT:

FIELD OF THE INVENTION
The present invention is directed to squaring circuits, and more particularly, squaring circuits used in electronic devices such as radio automatic gain control circuits (AGC).
BACKGROUND OF THE INVENTION
Many conventional narrow band zero intermediate frequency (ZIF) receivers have slow AGC loop settling times, such as on the order of 6 to 10 milliseconds (msec.), and dynamic ranges that are too narrow, e.g., 85 decibels (dB). These characteristics lead to less than desirable performance in the fading conditions found in mobile and portable radio communication systems, such as paging, personal communication systems, and cellular communication systems. Furthermore, inexact gain control by prior art AGC's increases the difficulty of reducing DC offset, which reduces signaling performance. What is needed is a low cost AGC that is fast, has a dynamic range in excess of 110 dB and provides more exact gain control.


REFERENCES:
patent: 4905307 (1990-02-01), Frank

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