Design Of Low-power Super-regenerative Oscillator And Pre-amplifier In Super- Regenerative Receiver

In recent years, IoT (Internet of Things) and smart home attract a lot of attention. Thus, short range wireless controlling systems have been widely developed and applied. The super-regenerative architecture becomes the first choice to realize the receiver in such systems for the advantages of its low cost, low power, and convenience.In this thesis, the principle of super-regeneration is introduced at first, and the theory of super-regeneration is analyed base on the Unified theory. Thus the result of it can be widely used in kinds of super-regeneration receiver (SRR). Then we convert the actual circuit property to those used in the equivalent analysis. It helps us to understand its effects in the super-regeneration oscillator, and guide us to design the circuit properly.An SRR achieves great super-regeneration gain by different signal injection intensity to change the oscillation start-up time. Thus, the super-regeneration oscillator (SRO) is the key module in this receiver. The low noise amplifier (LNA) is also an important part as it act as a buffer between antenna and super-regeneration oscillator. The specs of the LNA is analyzed and a proper LNA suitable for SRR is designed. Based on the analysis of the SRO, A low-power self-quench super-regenerative oscillator is designed by amplitude detection. It can avoid the exquisite to the fluctuations in technology, supply voltage, temperature and so on. At last, for the digital demodulation, a self-detection based fast start-up SRO has been devised to improve the sensitivity.The self-quench SRO has been implemented in a standard 0.18-μm CMOS technology. The measured results show that the receiver consumes a current of 1.2-2mA with the supply voltage range of 1.4-1.8 V, working frequency of 315MHz. Even though the input signal is as low as-80dBm, the SRO have obvious self-quench-frequency difference. The self-detection based fast start-up SRO has been implemented in a standard 0.5-μm CMOS technology. The measured digital demodulation results show a great sensitivity improvement with the comparison of none self-detection based fast start-up SRO.