Applied To The Gyro Sensors Integrated Dual-frequency Sinusoidal Signal Source

A 190-kHz and 310-kHz dual-frequency, low-distortion, low-noise, integrated sinusoidal signal generator which be used in gyroscope readout system is presented in this paper. In today's rapidly changing period of IC development, as an important module in the circuitry, the sinusoidal signal generator is widely used in the system. The development of system on chip integration of the signal generator is also set forth requirements. Many researchers at home and abroad are keen commitment to research and design high-performance integrated sinusoidal signal generator. The circuit structure and performance still have much room for improvement.There are many types of sinusoidal oscillator, such as RC/LC oscillators and crystal oscillators. RC oscillators have tremendous advantages in integrated circuit applications, which be divided into bridge oscillator, double-T type network and other types of phase-shifting. Because of this gyroscope readout system project has low distortion demanding to sinusoidal signal generator, Wien-bridge structure of the RC oscillator circuit is used. A fourth-order active RC band-pass filter and output buffer is cascaded with the oscillator to constitute the entire circuit module.The sinusoidal signal generator studied in this paper is realized in 0.5μmBiCMOS process. By using the bipolar devices with lower flicker-noise as well as higher gm values than the MOS devices, the overall circuit performance is effectively improved.The main work of this paper is as follows:1. The structure of Wien-bridge oscillator with automatic amplitude control function used in integrated circuits is introduced.2. A high bandwidth, high open-loop gain, low distortion, low input noise Class-AB operational amplifier used in the Wien-bridge oscillator is presented in this paper.3. A fourth-order active-RC band-pass filter based on Delyannis-Friend structure is demonstrated.4. A low distortion, low noise, and high frequency stability integrated sinusoidal signal generator system is designed. This paper first introduces the development history of integrated circuits as well as IC design process, and then goes separately for each module to explain the basic principles and design implementations, at last, a detailed analysis of the sinusoidal signal generator system cascade design, simulation methods, layout, and post-simulation is taken. Through a comprehensive analysis of simulation data to ensure the stability, reliability and achievability of the design, this paper provides a complete data support for the system-level design and tapeout. By optimizing the layout design method, only about 0.9mm~2 of silicon area is used in 0.5μm Bi-CMOS process to achieve the system requirements of dual-frequency sinusoidal signal generator design specifications.