针对传统超再生接收机频率准确性不高的问题，提出了一种应用于低速率、短距 离无线传感器网络的基于晶体的超再生接收机． 该接收机使用晶体振荡器取代传统的由 电感电容或者电阻电容构成的超再生振荡器; 借助晶体超高的品质因数，该超再生接收机 实现了与晶体振荡器一样的接收频率准确度和稳定性，并且不受工艺、工作电压和环境温 度的影响． 文中使用 0. 18 μm CMOS 工艺实现了一个原型芯片，该芯片运用双向驱动电 路，克服了晶体起振慢和不易完全停振的挑战，实现了参考时钟振荡器按照超再生方式运 行和 －78dBm 的灵敏度( 1kb/s 数据率) ． 测试数据表明，该接收机的频率选择性改善达 50 倍，灵敏度中心频率偏离目标频率仅 7 × 10 －6，达到了参考级频率准确性的精度． 该接 收机外围电路只需一个晶体和少量电源滤波电容，为无线传感器网络等应用提供了一个 非常紧凑的方案，特别适用于无线内窥镜胶囊应用． 

 To overcome the poor frequency accuracy and selectivity of the conventional superregenerative receiver (SＲＲ)，a SＲＲ based on crystal has been proposed for low-data rate and low distance wireless sensor network (WSN)． This SＲＲ adopts a crystal oscillator (XO) as a superregenerative oscillator (SＲO) instead of the conventional LC or ＲC oscillator． With the help of the ultra-high quality factor of the crystal this SＲＲ has achieved the same accuracy and stability of working frequency as a crystal，and is immune to variations of process，voltage and temperature． A prototype chip， implemented in 0. 18-μm CMOS technology，utilizes a bi-direction driver to overcome the challenges of slow start-up and fully quenching，makes a reference XO work in a super-pre-generative manner，and then achieves sensitivity of －78dBm (1kb/s data rate)． The measured data show 50 times improvement on the frequency selectivity，and 7 ×10 －6 frequency error from the target frequency，which matches the reference-class accuracy． This receiver supplies a very compact solution with only a crystal being needed outside except several decoupling capacitors，which is suitable for WSN applications，e. g． wireless capsule endoscopy．