Ulllted States Patent [19]
`Sorrells et al.
`
`US006061551A
`[11] Patent Number:
`[45] Date of Patent:
`
`6,061,551
`May 9, 2000
`
`[54] METHOD AND SYSTEM FOR DOWN-
`
`FOREIGN PATENT DOCUMENTS
`
`O 035 166 A1 2/1981 European Pat. Off. ........ .. H04B 1/26
`0 193 899 B1 9/1986 European Pat. Off. ........ .. GO1S 7/52
`0 380 351 A2 8 1990 E
`P t. Off. ..... .. HO3H 17 O4
`_/
`_ “mpean a
`/
`(Llst Con?rmed On 99>“ page)
`OTHER PUBLICATIONS
`Akers, N.P. et al., “RF sampling gates: a brief review,” IEE
`Proceedings—A, vol. 133, Part A, No. 1, Jan. 1986, pp.
`
`_
`_
`_
`_
`45_49~
`Faulkner, Nell D. and Mestre, Enrlc Vllar, “Subharmonlc
`Sampling for the Measurement of Short—term Stability of
`Microwave Oscillators,” IEEE Transactions on Instrumen
`tation and measurement, vol. IM—32, No. 1, Mar. 1983, pp.
`
`208—213-
`“
`_
`_
`Itakure T» Effect? of the samphng P111Se Wldth 9“ Phi
`frequency characteristics of a sample—and—hold circuit,
`4Hafiz”???“@2522? and Systems) Aug'
`’V° '
`’
`0' ’PP'
`_
`'
`(List Continued on neXt page.)
`Primary Examiner—Doris H. To
`Assistant Examiner—Sam Bhattacharya
`Attorney, Agent, or Firm—Sterne, Kessler, Goldstein & FoX
`P.L.L.C.
`
`[57]
`
`ABSTRACT
`
`_
`Methods, systems, and apparatuses for down-converting an
`electromagnetic (EM) signal by aliasing the EM signal are
`described herein. Brie?y stated, such methods, systems, and
`apparatuses operate by receiving an EM signal and an
`aliasing signal having an aliasing rate. The EM signal is
`aliased according to the aliasing signal to down-convert the
`EM signal. The term aliasing, as used herein, refers to both
`down-converting an EM signal by under-sampling the EM
`signal at an aliasing rate, and down-converting an EM signal
`by transferring energy from the EM signal at the aliasing
`rate. In an embodiment, the EM signal is down-converted to
`an intermediate frequency (IF) signal. In another
`embodiment, the EM signal is down-converted to a demodu
`lated baseband information signal. In another embodiment,
`the EM signal is a frequency modulated (FM) signal, which
`is down-converted to a non-FM signal, such as a phase
`modulated (PM) signal or an amplitude modulated (AM)
`slgnal
`
`204 Claims, 126 Drawing Sheets
`
`ggNN‘glilgTlNG ELECTROMAGNETIC
`
`[75] Inventors: David F. Sorrells; Michael J.
`Bultman, both of Jacksonville; Robert
`W. Cook, Switzerland; Richard C.
`gloike; cllllarl? gig/loses’ Jr" both of
`ac Sonvl 6’ a O
`a’
`
`[73] Assignee: Parkervision, Inc., Jacksonville, Fla.
`
`[21] APPL NO; 09/176,022
`_
`_
`Flled'
`
`Oct‘ 21’ 1998
`
`[22]
`
`[51] Int. cl.7 ................................................... .. H01Q 11/12
`[52] US. Cl. ........................ .. 455/118; 455/313; 455/323;
`455/324
`[58] Field Of Search ................................... .. 455/131, 139,
`455/142, 182.1, 202, 205, 313, 317, 318,
`323, 118, 113, 324; 329/345, 347; 327/9,
`91; 702/66> 70
`
`56
`[
`1
`
`-
`R f
`Ct d
`e erences l e
`U.S. PATENT DOCUMENTS
`
`4/1997 Nicollini ............................... .. 327/554
`Re. 35,494
`6/1998 Sanderford, Jr.
`Re. 35,829
`2,057,613 10/1936 Gardner .................................... .. 250/8
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`2,270,385
`1/1942 Skillman
`.. 179/15
`2,283,575
`5/1942 Roberts . . . . .
`. . . . . . .. 250/6
`2,358,152
`9/1944 Earp -------- --
`- 179/171-5
`179/15
`2,410,350 10/1946 Labin et a1- -
`2,451,430 10/1948 Baron? ------------ ~~
`250/8
`2,462,069
`2/1949 chattel'lea et al-
`~~ 250/17
`274627181
`2/1949 Grossel?nger
`~~~~ " 250/17
`234723798
`6/1949 Fredendan """"" "
`" 178/44
`g/
`llg’otughtwood et a1‘ "
`3304?
`2’8O2’2O8 Q1957 Heosgsson ' ' ' ' ' ' ' ' ' ' ' ' ' ' '
`' ' ' ' "343/1/76
`2’985’875
`5/1961 Grisdalg'el'
`343/100
`'
`3’023’309
`2/1962 Foulkes
`" 250/17
`3’O69’679 12/1962 sweeney'é'glimj
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`371047393
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`. . . . .. 325/56
`3,118,117
`1/1964 King et al. .............................. .. 332/22
`(List continued on next page.)
`
`CONVENTIONAL
`REEEégER
`\
`
`1104
`EH SIGNAL
`(2.5;..900MHZ)
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`
`RPX-Farmwald Ex. 1001, p 1
`
`

`
`6,061,551
`Page 2
`
`U.S. PATENT DOCUMENTS
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`
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`
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`
`
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`
`
`
`476037300 476127464
`
`
`
`7/1986 Welles’ H et a1' ~~~~~~~~~~~~~~~~~~~~~~ ~~ 9/1986 Ishikawa et aL _ 307/496
`
`
`
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`3,454,718
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`3,523,291
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`4,737,969
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`4,745,463
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`
`6/1976
`.
`3,967,202
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`3,980,945
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`
`4,757,538
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`
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`4,047,121
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`4,066,841
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`. 307/220 R
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`
`RPX-Farmwald Ex. 1001, p 2
`
`

`
`6,061,551
`Page 3
`
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`..
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