公开(公告)号：US07289004B2

公开(公告)日：2007-10-30

申请号：US11204141

申请日：2005-08-15

Applicant: Evelyn L Chan ,  Fuad Haji Mokhtar ,  Ann Yen Lim

Inventor： Evelyn L Chan ,  Fuad Haji Mokhtar ,  Ann Yen Lim

IPC: H03C3/09

CPC classification number: H03C3/0925 ,  H03C3/08 ,  H03C3/0933 ,  H03C3/0941 ,  H03C3/0958 ,  H03C3/0975 ,  H03C3/20

Abstract: The present invention relates generally to the field of frequency modulation, and in particular to dual port frequency modulators. The present invention provides a frequency modulator comprising a phase lock loop circuit (108) for receiving and modulating a carrier signal according to the low frequency component of a modulating signal, the phase lock loop circuit comprising a voltage controlled oscillator (118) for outputting a modulated carrier signal and a loop filter (116) for outputting a steering voltage to the VCO, the VCO having a tank circuit (120) comprising a voltage controlled capacitance (VAR1). The frequency modulator also comprises an external voltage controlled capacitance (122) which is arranged to modulate its capacitance according to a high frequency component of the modulating signal, the second voltage controlled capacitance being coupled to the tank circuit. The phase lock loop circuit (108) is further arranged to modulate the steering voltage to the VCO (118) with the high frequency component of the modulating signal.

Abstract translation: 本发明一般涉及频率调制领域，特别涉及双端口频率调制器。 本发明提供了一种频率调制器，其包括用于根据调制信号的低频分量接收和调制载波信号的锁相环电路（108），所述锁相环电路包括用于输出调制信号的压控振荡器（118） 调制载波信号和用于向VCO输出转向电压的环路滤波器（116），所述VCO具有包括压控电容（VAR 1）的振荡电路（120）。 频率调制器还包括外部电压控制电容（122），其被布置成根据调制信号的高频分量调制其电容，第二压控电容耦合到储能电路。 锁相环电路（108）还被布置成用调制信号的高频分量调制到VCO（118）的转向电压。