Variable gain received signal strength indicator

Details Variable gain received signal strength indicator Variable gain received signal strength indicator

2004-03-11

2008-03-04

Hirshfeld, Andrew H. (Department: 2858)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

C324S096000

Reexamination Certificate

active

07339363

ABSTRACT:
An RSSI circuit provides a relatively inexpensive technique for accurately measuring received signal strength over a wide dynamic range. A received signal is processed by a rectifier circuit that generates a series of DC offsets of increasing magnitude. The DC offsets are imposed on a first polarity of the received signal to create a series of outputs that are the first polarity of the received signal with increasing DC offsets. Each of the outputs is coupled to one input of a weighted comparator with the other input of the comparator coupled to a second and opposite polarity of the received signal with no offset. The comparators determine when overlap occurs to indicate particular signal levels.

REFERENCES:
patent: 4004220 (1977-01-01), Kerber et al.
patent: 5710981 (1998-01-01), Kim et al.
patent: 6720757 (2004-04-01), Khorram et al.
patent: 2002/0034191 (2002-03-01), Shattil

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