对RC桥式振荡器输出波形的研究

随着电子技术理论和电子器件的不断发展，ＲＣ桥式电路的研究不断深入，其应用范围也更加广泛．本文从理论上论证ＲＣ桥式振荡电路输出电压的波形及特征，阐述该振荡器正常工作的必要条件．图２，参２．

Key Techniques of Frequency Synthesizer for WLAN Receivers

Several key techniques for a PLL-type frequency synthesizer for WLAN receivers are studied. Its structure is analyzed and the main parameters are proposed. A monolithic LC-tuned voltage controlled oscillator （LCVCO） with low phase noise is fabricated with TSMC 0.18μm RF （radio frequency） CMOS technology. The measured phase noise is - ll7dBc/Hz at 4MHz off the center frequency of 4. 189GHz. A down-scaling circuit with low power dissipation was fabricated in a TSMC 0.18μm mixed-signal CMOS process. The measured results show that the IC can work well under a 1.8V power supply. Its total power dissipation is only 13mW.

系统频率响应的数控分析

电子电路或实验仪器的频率响应,通常用变频振荡器和示波器进行分析。随着微机应用于实验室,有可能对系统的频率响应进行数控分析,从而获得分辨度高且快速的分析技术。 一、电子电路 微机数控频率响应测试设备的框图见图1。由微机发出数字信息,控制变频振荡器的振荡频率,数控振荡信号送入待测试的系统,系统响应后送出的信息由检波器检波,

用改变电感的方法实现低频VCO

本文根据改变变压器互感,来实现变频振荡器工作的一种新方式。如果L是线圈的电感,有一交变电流通过该线圈,同时一部分电流流过互耦合线圈,第一个线圈的等效电感Le是L1±M,由于第二个线圈与第一个线圈的绕制方向可以相同,也可以不同,所以带有正负号。

Variable Frequency Harmonic Oscillator in an Electromagnetic Field

The invariant, propagator, and wavefunction for a variable frequency harmonic oscillator in an electromagnetic field are obtained by making a specific coordinate transformation and by using the method of phase space path integral method. The probability amplitudes for a dissipative harmonic oscillator in the time varying electric field are obtained.