3 . the sensing circuit tuning fork micromechanical gyroscope is designed . as for the detecting circuit of the capacitances , the " charge sense " circuit are improved , and the detecting bridge is designed 电容检测电路采用电荷放大器方案，并且对其进行了改进；对电容检测电路的输出信号进行了分析，设计了信号检测电路，有效的分离出了输入角速度。
In the blue print of the analog , author utilize the big dynamic vga to realize the if amplifier and use the audion to carry out the 80db agc , through the improvement of the traditional detect circuit , extend the dynamic range of the detector 在模拟方案中,笔者采用了大动态的vga实现中频放大;利用三极管检波实现了80db的agc控制;通过对传统二极管检波电路改进,提高了检波器的动态范围。
Trough the analysis of the output of the detecting circuit of the capacitances , the processing circuit is designed , and the angular rate is separated : parameters computed of the gyroscope and the performance analyzed of the circuit show that the circuit can reach the base requirement 经过对电路性能的分析、陀螺主要参数的估算，确定所设计的电一几}北邢业人学学位论义路可以达至fj基本要求。
Then the hardware frame of the servo driver is introduced , especially the design of the dsp minimal system , current detecting circuit , speed and position - acquiring circuit , power circuit based on ipm are further researched . the software frame of the servo system is introduced and the flow chart is given . many experiments have been done on improving the speed and current response performance 然后介绍了所设计的伺服驱动器的硬件框架，重点介绍了dsp最小系统、电流检测电路、位置检测电路和以ipm为核心的主电路；进一步介绍了控制系统的软件结构，给出了详细的软件流程图；针对系统电流环响应性能和速度响应性能作了大量的实验研究，从实验结果看出，高速时系统速度具有很好的响应性能，低速时速度响应性能较差，表现为速度有较大的脉动。
The power circuit of the system adopts the voltage frequency conversion structure of ac - dc - ac , and is composed of the commutation circuit , filter circuit and intelligence power module ( pm15rsh120 ) . control circuit takes the dsp chip tms320lf2407 as core , including the pwm signal occurrence circuit , detect circuit of stator current and direct current voltage of generatrix , drive circuit of intelligence power module , detect circuit of speed , protect circuit of system etc . all of this builds the full digital vector control system of asynchronous motor 该系统的功率电路采用电压型的交-直-交变压变频结构,由整流电路、滤波电路及智能功率模块ipm ( pm15rsh120 )逆变电路构成;控制电路以dsp芯片tms320lf2407为核心,加上pwm信号发生电路、定子电流检测电路、直流母线电压检测电路、智能功率模块驱动电路、速度检测电路、系统保护电路等,构成了功能齐全的异步电机全数字化矢量控制系统。
Secondly the detection precision is only related to the synchronization phase but not to the amplitude of the mainline voltage because that it uses the optimized pulses synchronous with the mainline voltage as modulation signals . thirdly it decreases the requirement of the input low pass filter and eliminates the error resulting from the direct component and even harmonics of load current . the most significant merit is that it can eliminate the effect of a few low order odd harmonics and the detecting circuit is easy to be implemented 仿真和实验结果表明该方法的主要优点有：不需使用乘法器进行信号调制，调制信号采用与电网电压同步的优化特定脉冲，其检测精度只与同步相位有关，而与电网电压幅值无关；降低了对输入低通滤波器的通频带要求，直流和偶次谐波分量对检测精度没有影响；突出的优点是可以消除有限个低奇次谐波对检测结果的影响。
