频率综合器及其选频电路、选频方法技术

本发明专利技术揭示了一种频率综合器及其选频电路，选频电路包括电容Ｃ１、电容Ｃ２、电感Ｌ１、电感Ｌ２；电容Ｃ１的两端分别连接电感Ｌ１、电感Ｌ２的一端；电容Ｃ２的两端分别连接电感Ｌ１、电感Ｌ２的另一端；电容Ｃ１的两端分别连接混频器，连接端点记作ＯＵＴＰ、ＯＵＴＮ；设定电感和电容Ｃ２的值，使电路谐振在滤波的频率上，ＯＵＴＰ和ＯＵＴＮ两端的阻抗是电感的等效串联电阻，选频电路为滤波电路；设定电容Ｃ１的值，使电路谐振在通带的频率上，此时ＯＵＴＰ和ＯＵＴＮ两端是ＬＣ的并联谐振，选频电路为放大电路。本发明专利技术把１／３＋２／３的滤波电路和混频电路结合到一起，对有用的信号放大，对无用的信号进行压制，并且能够芯片集成。

Frequency synthesizer and frequency selecting circuit and frequency selecting method thereof

The invention discloses a frequency synthesizer and frequency selection circuit, a frequency selection circuit includes a capacitor C1, a capacitor C2, an inductor L1 and an inductor L2; both ends are respectively connected with the C1 end capacitance inductance L1, inductance L2; the other end of the capacitor C2 are respectively connected to both ends of an inductor L1 and an inductor L2; both ends of the capacitor C1 are connected to the mixer that connection endpoint denoted as OUTP and OUTN; the setting of inductance and capacitance value of C2, the resonant circuit in filter frequency, impedance OUTP and OUTN ends of the inductor is the equivalent series resistance, frequency selective circuit for capacitance filter circuit; set the value of C1, the circuit resonance in the passband frequency, at OUTP OUTN and LC are two parallel resonant circuit for amplifying circuit, frequency. The filter circuit and the mixer circuit 1 / 3 + 2 / 3 together, amplification of the useful signal, the unwanted signal suppression, and chip integration.

【技术实现步骤摘要】

【技术保护点】
一种频率综合器的选频电路，其特征在于，该选频电路包括电容Ｃ１、电容Ｃ２、电感Ｌ１、电感Ｌ２；　　　　所述电容Ｃ１的两端分别连接电感Ｌ１、电感Ｌ２的一端；所述电容Ｃ２的两端分别连接电感Ｌ１、电感Ｌ２的另一端；　　　　所述电容Ｃ１的两端分别连接混频器，连接端点记作ＯＵＴＰ、ＯＵＴＮ；　　　　设定电感和电容Ｃ２的值，使电路谐振在滤波的频率上，ＯＵＴＰ和ＯＵＴＮ两端的阻抗是电感的等效串联电阻，所述选频电路为滤波电路；　　　　设定电容Ｃ１的值，使电路谐振在通带的频率上，此时ＯＵＴＰ和ＯＵＴＮ两端是ＬＣ的并联谐振，所述选频电路为放大电路。

【技术特征摘要】

【专利技术属性】
技术研发人员：刘瑞金，迮德东，
申请(专利权)人：捷顶微电子上海有限公司，
类型：发明
国别省市：31[中国|上海]