rf oscillator

rf oscillator, rf modulator, dcr receiver and other circuits compose of rf front end circuits;

射频前端电路由射频振荡器、调制器、直接混频接收器以及脉冲放大器等部分组成；

The transmitter of this design is based the Direct Quadrature-up Conversion ( DQUC) structure. And the Local Oscillator signal is worked in two times of RF frequency, which not only save design cost, but also solves the spill caused the direct current system performance deterioration.

发射机部分采用直接上变频结构，具有很好的镜像抑制特性，并且本振信号以两倍射频频率工作，这样既节省了设计成本，又解决了直流泄漏导致的系统性能恶化的问题。

Purpose: FM RF amplifier and local oscillator of FM tuner.

用途: 用于调频、射频放大电路及调频调谐器中的本机振荡.

It put forward the design methods of oscillator based on the RF transistor which work at the characteristic frequency. It design preamplifier based on the principle of positive feedback. It is possible to set alarm automatically by micro-controller and other chips.

文章根据多普勒效应设计微波探测器，提出了基于射频三极管在特征频率下的应用设计振荡器的方法，设计了基于正反馈原理的前置放大器，利用单片机及其它外围芯片可实现自动拨号报警。

theory of cross-coupled rf oscillator for poly- and quadrature-phase signal generation

用于多相和正交信号产生的RF互耦振荡器原理