| 摘要 |
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. All post-detection (demodulator) data filtering is provided on the receiver chip, so no external filters need to be designed.
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