Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Reexamination Certificate
2007-02-27
2007-02-27
Urban, Edward F. (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
C455S136000, C455S139000, C455S209000, C375S332000
Reexamination Certificate
active
10715608
ABSTRACT:
A direct conversion receiver (DCR) calibrated for phase and gain mismatch is provided. The DCR comprises a poly-phase filter that generates mismatched in-phase and quadrature-phase differential signals; the in-phase differential signal is mixed with first and second local oscillation signals; the quadrature-phase differential signal is mixed with third and fourth local oscillation signals; the first and second local oscillation signals have a first adjustable phase mismatch, and the third and fourth oscillation signals have a second adjustable phase mismatch; A mismatch estimation unit (MEU) estimates the entire phase/gain mismatch (signal distortion) of the DCR, The first and second adjustable phase mismatches are adjusted so that the signal distortion of the DCR, as estimated by the MEU is minimized. Thereafter, reduced-component DCRs (without an MEU), calibrated for the mismatches of a poly-phase filter, may be mass produced.
REFERENCES:
patent: 5095536 (1992-03-01), Loper
patent: 5179730 (1993-01-01), Loper
patent: 5249203 (1993-09-01), Loper
patent: 5488629 (1996-01-01), Takahashi et al.
patent: 6289048 (2001-09-01), Richards et al.
patent: 6590943 (2003-07-01), Ali
patent: 2001/0028689 (2001-10-01), Kasperkovitz
patent: 2002/0155822 (2002-10-01), Adachi
patent: 2004/0038649 (2004-02-01), Lin et al.
patent: 2004/0116096 (2004-06-01), Shen
patent: 0 841 756 (1998-05-01), None
patent: 0 841 756 (2001-11-01), None
patent: WO02075917 (2002-09-01), None
Double, Zero, Single, Low IF Receiver architecture, MICROS Research Center, Jul. 3, 2001.
Asad A. Abidi, Direct-Conversation Radio Transceivers for Digital Communications, IEEE Journal of Solid-State Circuits, vol. 30, No. 12, Dec. 1995.
Derek K. Shaeffer, The Design and Implementation of Low-Power CMOS Radio Receivers, A Dissertation Submitted to the Dept. of Electrical Engineering and the Committee on Graduate Studies of Stanford Univeristy, Chapt. 3: Fundamentals of Radio Reception, pp. 48-49, Dec. 1998.
F. Chau & Associates LLC
Le Nhan T.
Samsung Electronics Co,. Ltd.
Urban Edward F.
LandOfFree
Direct conversion receiver for calibrating phase and gain... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Direct conversion receiver for calibrating phase and gain..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Direct conversion receiver for calibrating phase and gain... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3878230