Signal source with multiphase filter

Details Signal source with multiphase filter Signal source with multiphase filter

2007-07-17

2007-07-17

Ramakrishnaiah, Melur (Department: 2614)

Telecommunications

Receiver or analog modulated signal frequency converter

C455S131000, C455S255000, C455S260000

Reexamination Certificate

active

09961986

ABSTRACT:
The invention relates to a signal source (S) which comprises a local oscillator (5) for generating a reference frequency signal fo. The signal source comprises:a frequency divider by N (6) connected to the local oscillator (5) and delivering two quadratic square-wave signals (Id, Qd) at a frequency fo/N,N being equal to 2 or 4×n, and n being an integer number, anda multiphase filter (7) which supplies two sinusoidal quadratic signals (Is, Qs) at a frequency equal to m·fo/N on the basis of the quadratic signals (Id, Qd) issued by the frequency divider, m being an odd number.The invention finds its application in direct frequency conversion circuits and transmission circuits used in the field of telecommunication.

REFERENCES:
patent: 5712596 (1998-01-01), Van Amesfoort
patent: 5715529 (1998-02-01), Kianush et al.
patent: 6404293 (2002-06-01), Darabi et al.
patent: 6560449 (2003-05-01), Liu
patent: 6636731 (2003-10-01), Greer
patent: 6850749 (2005-02-01), Soorapanth et al.
patent: 2002/0021762 (2002-02-01), Takagi
patent: 0926811 (1999-06-01), None
patent: 2282303 (1995-03-01), None

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