Radio receiver in CMOS integrated circuit

Details Radio receiver in CMOS integrated circuit Radio receiver in CMOS integrated circuit

2000-12-11

2003-12-09

Vuong, Quochien (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S313000, C455S266000

Reexamination Certificate

active

06662003

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to radio wave receivers and, in particular, to a receiver formed as a single integrated circuit.
BACKGROUND
Radio receivers, such as amplitude modulation (AM) type receivers, are well known. It is desirable for cost and size reasons to implement such receivers on a single integrated circuit chip. However, obstacles have prevented a practical AM receiver from being implemented on a single chip.
SUMMARY
A single chip superheterodyne AM receiver is disclosed herein. Pin count may be 4 or more. The receiver is a OOK (ON-OFF keyed) Receiver IC for remote wireless applications. This device is an “antenna-in, data-out” monolithic device. All RF and IF tuning is accomplished automatically within the IC, which eliminates manual tuning, and reduces production costs. Receiver functions are completely integrated. The result is a highly reliable yet extremely low cost solution for high volume wireless applications. Because the receiver is a true single-chip radio receiver, it is extremely easy to apply, minimizing design and production costs, and improving time to market.
The receiver uses a novel architecture that allows the receiver to demodulate signals over a wide RF band, which eliminates the need for manual tuning. This is referred to as a swept LO mode. This also significantly relaxes the frequency accuracy and stability requirements of the Transmitter, allowing the receiver to be compatible with both SAW-based and LC-based transmitters. The receiver sensitivity and selectivity are sufficient to provide low bit error rates for decode ranges over 100 meters, equaling the performance of other more expensive solutions.
All tuning and alignment are accomplished on-chip with a reference frequency provided by a low-cost ceramic resonator or an externally supplied clock reference. The receiver performance is insensitive to data modulation duty cycle. The receiver may be used with such coding schemes as Manchester or 33/66% PWM.
To prevent noise from the clock reference decreasing the sensitivity of the receiver, the IF filter is tuned such the no integer multiple or integer divisor frequency of the timing reference occurs in the IF pass band.
All post-detection (demodulator) data filtering is provided on the receiver chip, so no external filters need to be designed. Any one of four filter bandwidths may be selected externally by the user. Bandwidths range from 0.6 kHz to 4.8 kHz in binary steps.
The various filters and demodulator have frequency characteristics based on the output of an internal timing generator which receives clock signals from an external reference. Therefore, tuning of the filters and demodulator may be accomplished by changing the external reference frequency.


REFERENCES:
patent: 4336613 (1982-06-01), Hewes
patent: 4554678 (1985-11-01), Bowman
patent: 5012490 (1991-04-01), Myer
patent: 5020147 (1991-05-01), Okanobu
patent: 5077835 (1991-12-01), Margairaz et al.
patent: 5134406 (1992-07-01), Orr
patent: 5475871 (1995-12-01), Shalev et al.
patent: 5555453 (1996-09-01), Kajimoto et al.
patent: 5630218 (1997-05-01), Muto
patent: 5640698 (1997-06-01), Shen et al.
patent: 5710997 (1998-01-01), Okanobu
patent: 5734976 (1998-03-01), Bartschi et al.
patent: 5930695 (1999-07-01), Yamaguchi et al.
patent: 5933769 (1999-08-01), Kaneko
patent: 6167246 (2000-12-01), Elder et al.
patent: 6278866 (2001-08-01), Elder et al.
patent: 6324390 (2001-11-01), Elder et al.
patent: 6377788 (2002-04-01), Elder et al.
patent: WO 98/49779 (1998-11-01), None
patent: 99/59256 (1999-11-01), None
PCT Written Opinion for International Application No. PCT/US/99/09995, filed May 6, 1999.
Abidi, Asad A., “CMOS-only RF and Baseband Circuits for a Monolithic 900 MHz Wireless Transceiver*,” Bipolar Circuits & Tech. Mtg., Minneapolis, Oct. 1996, pp. 35-42.
Abidi, Asad A., “Radio-Frequency Integrated Circuits for Portable Communications,”Custom IC Conference,San Diego, CA, May 1994, pp. 151-158.
Chang, P. J., Rofougaran, A., and Abidi, A. A., “A CMOS Channel-Select Filter for a Direct-Conversion Wireless Receiver,”On VLSI Circuits,Honolulu, pp. 62-63, 1996.
Chang, J., Abidi, A. A., and Viswanathan, C.R., “Flicker Noise in CMOS Transistors from Subthreshold to Strong Inversion at Various Temperatures,”IEEE Trans. On Electron Devices,vol. 41, No. 11, pp. 1965-1971, 1994.
Khorram, S. et al., “A CMOS Limiting Amplifier & Logarithmic Signal-Strength Indicator,” Integrated Circuits & Systems Laboratory, Electrical Engineering Department, University of California, Los Angeles (19 pages).
Rofougaran, A., et al., “A 900 MHz CMOS Frequency-Hopped Spread Spectrum RF Transmitter IC,”Custom Integrated Circuits Conf.,San Diego, CA, May 1996, pp. 209-212.
Rofougaran, A. et al., “A 900 MHz CMOS Frequency-Hopped Spread Spectrum RF Transmitter IC,” Integrated Circuits & Systems Laboratory, Electrical Engineering Department, University of California, Los Angeles (20 pages).
Rofougaran, A., Chang, J. Y.-C., Rofougaran, M., Khorram, S., and Abidi, A. A., “A 1 GHz CMOS RF Front-End IC with Wide Dynamic Range,” presented atEuropean Solid-State Circuits Conf.,Lille, France, pp. 250-253, 1995.
Rofougaran, A., Chang, J. Y.-C., Rofougaran, M., Khorram, S., and Abidi, A. A., “A 1 GHz CMOS RF Front-End IC with Wide Dynamic Range,” (23 pages).
Rofougaran, A., et al., “A 900 MHz CMOS LC-Oscillator with Quadrature Outputs,” presented at the 1996 Int'l. Solid-State Circuits Conference, 10 pages.
Rudell, Jacques, C., University of California,Berkeley, “CMOS VLSI Frequency Translation for Multi-Standard Wireless Communication Transceivers,”Qualifying Examination, Apr. 8, 1996, pp. 1-24.
Chang, Glenn et al., “An Agile, Low-Power CMOS Digitally Synthesized 0-13 MHz Sinewave Generator,” Integrated Circuits & Systems Laboratory, Electrical Engineering Department, University of California, Los Angeles, (14 pages).

Affiliated with

Also associated with

Rating

Radio receiver in CMOS integrated circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Radio receiver in CMOS integrated circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radio receiver in CMOS integrated circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3174710