Low pass filters for high dynamic range wideband direct...

Details Low pass filters for high dynamic range wideband direct... Low pass filters for high dynamic range wideband direct...

2005-03-01

2005-03-01

Ghebretinsae, Temesghen (Department: 2637)

Pulse or digital communications

Receivers

C375S343000, C455S302000, C455S323000, C708S314000

Reexamination Certificate

active

06862323

ABSTRACT:
Disclosed are a low pass filter, and a direct conversion receiver (DCR) implementing the same, which filter and second signal channels with improved phase and gain match, allowing use of the filter and DCR in wideband environments. A first M-pole filter channel, comprised of a first plurality of 2-pole active filter stages, filters the first signal channel. A second M-pole filter channel, comprised of a second plurality of 2-pole active filter stages, filters the second signal channel. One of the second plurality of 2-pole filter stages includes two variable components. The values of the variable components of the second M-pole filter channel are adjusted to match the gain and phase of the first and second filter channels.

REFERENCES:
patent: 5084675 (1992-01-01), Reinfelder et al.
patent: 5179730 (1993-01-01), Loper
patent: 5230099 (1993-07-01), Loper
patent: 6008706 (1999-12-01), Holme et al.
patent: 6195539 (2001-02-01), Galal et al.
patent: 6631170 (2003-10-01), Gu

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