`
`jjacobs[jjacobs]
`
`To:
`From:
`Sent:
`Importance:
`Subject:
`Categories:
`
`Prashant Kantak
`Tue 8/11/1998 1 :36:28 AM
`Normal
`ParkerVision
`text/plain; charset="us-ascii"
`
`Jeff,
`Obviously, not the same person I was talking about! I thought this was one
`of that Jeffs
`many companies.
`
`Anyway, on to this one, it just sounds too good to be true! This is
`virtually the holy grail
`of RF receiver designs -- achievable and within practical limits! In
`recent years, with the advancement
`of DSP technology, there's been a push toward digitizing closer and closer
`to RF frequencies in
`receivers, but with the huge amount of processing power required to do
`this, it becomes
`impractical/expensive, especially in portable equipment.
`
`Operation of an RF receiver:
`Most receivers (tunable over the receiving range) convert their receiving
`frequencies to an
`intermediate (constant) frequency (IF) for further processing. In this
`manner, even though they
`may receive signals over various incoming frequencies, most of the
`processing can be done
`in IF thereby leveraging common components (that don't need to be tuned or
`switched in and
`out each time you tune in to a different frequency).
`
`Consider the common FM radio, for example. The RF (front end) receives
`signals between
`87MHz to 108MHz. This front end has the ability to tune in to a particular
`frequency depending
`on the station selected. Once this signal is tuned in, it is scaled down
`to a lower constant frequency
`(let's say 455KHz) regardless of the frequency it was received on by the
`front end. From this
`point, the IF processing stages perform the function of extracting the
`baseband signal (in the
`FM radio case, audio information upto about 15KHz). The baseband signal is
`then amplified by
`audio amp. circuitry and sent to the speaker.
`
`PRKR's invention:
`Claims to emilinate all the IF stages and go from a lean, mean front end RF
`to baseband!
`
`CONFIDENTIAL
`
`QCPV001389987
`
`ParkerVision Ex. 2031
`IPR2021-00990
`Page 1 of 1
`
`
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