Systems and methods for reducing broadband image noise through a programmable bandwidth RF variable gain attenuator
원문보기
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0617054
(2006-12-28)
|
등록번호 |
US-7778618
(2010-09-06)
|
발명자
/ 주소 |
- Lu, Jianhua
- Santini, Mark
- Gao, Weinan
- Lindstrom, Mats
- Costa, Damian
|
출원인 / 주소 |
|
대리인 / 주소 |
Thomas, Kayden, Horstemeyer & Risley, LLP
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
6 |
초록
▼
Systems for suppressing image noise are provided. In this regard, one embodiment includes a system for suppressing image noise comprising a low noise amplifier (LNA) configured to amplify a received RF signal, an RF variable gain attenuator with an image rejection filter with programmable bandwidth
Systems for suppressing image noise are provided. In this regard, one embodiment includes a system for suppressing image noise comprising a low noise amplifier (LNA) configured to amplify a received RF signal, an RF variable gain attenuator with an image rejection filter with programmable bandwidth configured to suppress image noise and image interference, and an RF mixer configured to perform frequency translation.
대표청구항
▼
At least the following is claimed: 1. A system for suppressing image noise comprising: a low noise amplifier (LNA) configured to amplify a received RF signal; an RF variable gain attenuator with an image rejection filter with programmable bandwidth configured to suppress image noise and image inter
At least the following is claimed: 1. A system for suppressing image noise comprising: a low noise amplifier (LNA) configured to amplify a received RF signal; an RF variable gain attenuator with an image rejection filter with programmable bandwidth configured to suppress image noise and image interference, wherein the RF variable gain attenuator comprises: a low pass filter with an order of one or higher; and an adjustable capacitor array configured to provide a programmable bandwidth; and an RF mixer configured to perform frequency translation. 2. The system of claim 1, further comprising: an RF voltage controlled oscillator (RFVCO) configured to sample the frequency of the received RF signal in order to determine the bandwidth of the image rejection filter. 3. The system of claim 1, wherein the adjustable capacitor array comprises a plurality of capacitors coupled to a plurality of switches operative to provide different capacitance values. 4. The system of claim 1, wherein the adjustable capacitor array comprises means for providing different capacitance values. 5. The system of claim 1, wherein the adjustable capacitor array further comprises: a first capacitor electrically connected in series with a first switch; and a second capacitor electrically connected in series with a second switch. 6. The system of claim 5, wherein the adjustable capacitor array is operative to provide four selectable frequency ranges. 7. The system of claim 5, wherein the first capacitor and second capacitor are connected in parallel when the first switch and second switch are closed. 8. The system of claim 1, wherein the low pass filter is comprised of a passive resistor-inductor-capacitor filter operative to suppress broadband image noise. 9. The system of claim 1, wherein the RF variable gain attenuator is electrically connected to the output of the low noise amplifier. 10. The system of claim 1, wherein the low pass filter is a second order filter. 11. The system of claim 1, wherein the RF variable gain attenuator is embodied in at least one of the following: a tuner board, a set-top box, a satellite system, a television, a computing device, a cellular telephone, and a wireless communication receiver. 12. A method for suppressing image noise comprising: receiving an RF signal; amplifying the RF signal; programming a frequency band such that any image noise present is located outside the frequency band; suppressing the image noise while allowing the RF signal to pass, wherein suppressing the image noise is performed using a low pass filter and an adjustable capacitor array configured to provide a programmable bandwidth; and mixing the RF signal to perform frequency translation. 13. The method of claim 12, wherein at least a portion of the method is performed in at least one of the following: a tuner board, a set-top box, a satellite system, a television, a computing device, a cellular telephone, and a wireless communication receiver. 14. A system for suppressing image noise comprising: a low noise amplifier (LNA) configured to amplify a received RF signal; and an RF mixer with a V/I converter embedded with an image rejection filter with programmable bandwidth configured to suppress image noise and image interference, wherein the image rejection filter comprises: a low pass filter with an order of one or higher; and an adjustable capacitor array configured to provide a programmable bandwidth. 15. The system of claim 14, wherein the image rejection filter is embodied in at least one of the following: a tuner board, a set-top box, a satellite system, a television, a computing device, a cellular telephone, and a wireless communication receiver.
이 특허에 인용된 특허 (6)
-
Lee Chong U. (San Diego CA), Adaptive block size image compression method and system.
-
Lee Chong U. (San Diego CA), Adaptive block size image compression method and system.
-
Ku Hsi-Yung (Taipei TWX), Cable television tuner.
-
Seo, Hae Moon; Park, Yong Kuk; Won, Kwang Ho; Yoo, June Jae, Multi-standard transceiver for supporting wireless communications in 2.3-2.4 GHz band.
-
Bazarjani Seyfollah S. ; Ciccarelli Steven C. ; Younis Saed G. ; Butterfield Daniel K., Receiver with sigma-delta analog-to-digital converter for sampling a received signal.
-
Gilhousen Klein S. (San Diego CA) Jacobs Irwin M. (La Jolla CA) Padovani Roberto (San Diego CA) Weaver ; Jr. Lindsay A. (San Diego CA) Wheatley ; III Charles E. (Del Mar CA) Viterbi Andrew J. (La Jol, System and method for generating signal waveforms in a CDMA cellular telephone system.
이 특허를 인용한 특허 (2)
-
Kim, Hyung Jung; Kim, Jae Hyung, Digital direct conversion receiving apparatus and method.
-
Gohn, Muriel; Noergaard, Thomas Gerner; Olesen, Dennis, Integrated circuit and method for reception of radio frequency signals.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.