Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Reexamination Certificate
2005-10-11
2005-10-11
Tran, Pablo N. (Department: 2685)
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
C455S260000
Reexamination Certificate
active
06954626
ABSTRACT:
A high frequency receiving device in accordance with the present invention includes a local oscillation circuit made up of multiple voltage-controlled oscillators. One of the oscillators is selected by a VCO selecting circuit. An oscillating signal, together with a high-frequency-received signal, is supplied to each mixer circuit. The signal outputs of the mixer circuits are supplied to respective LPFs to produce demodulated signal outputs. The cutoff frequencies of the LPFs are controlled by a cutoff frequency control circuit. A PLL is provided to correct shifts in the oscillation frequency of the voltage-controlled oscillator and intermittently shift in properties of the cutoff frequency control circuit. The circuit is reduced in size, and the signals related to the adjustment of the cutoff frequencies are prevented from undesirably find a path to act as noise on the base-band signal.
REFERENCES:
patent: 4211975 (1980-07-01), Kuroda
patent: 4261016 (1981-04-01), Hongu et al.
patent: 5511235 (1996-04-01), Duong et al.
patent: 5686864 (1997-11-01), Martin et al.
patent: 6134282 (2000-10-01), Ben-Efraim et al.
patent: 6512801 (2003-01-01), Ninomiya
patent: 6647258 (2003-11-01), Nonami
patent: 6707342 (2004-03-01), Zachan et al.
patent: 2003/0060177 (2003-03-01), Noboru et al.
patent: 2003/0206065 (2003-11-01), Gomez
patent: 8-191231 (1996-07-01), None
patent: 10-242883 (1998-09-01), None
patent: 11-298325 (1999-10-01), None
“A Fully Integrated Broadband Direct-Conversion Receiver for DBS Applications,” Arun. Jayaraman, et al., Conexant Systems Inc., Digital Infotainment Division, San Diego, CA, 2000 IEEE International Solid-State Circuits Conference.
LandOfFree
High frequency receiving device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High frequency receiving device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High frequency receiving device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3490033