公开(公告)号：US6127900A

公开(公告)日：2000-10-03

申请号：US163735

申请日：1998-09-30

申请人： Dana Vincent Laub ,  Julian L. Tham ,  Roy H. Fladager

发明人： Dana Vincent Laub ,  Julian L. Tham ,  Roy H. Fladager

IPC分类号： H03J5/24 ,  H03L7/099 ,  H03L7/187 ,  H03B5/12 ,  H03J3/20

CPC分类号： H03L7/187 ,  H03J5/244 ,  H03L7/099

摘要： The present invention includes a Voltage Controlled Oscillator (VCO) having a resonant circuit capable of being quickly switched between two resonant frequencies in order to generate two different LO frequencies. In a preferred embodiment, the present invention includes a VCO having a dual-frequency resonant circuit attached to the VCO's resonant circuit input leads. The dual-frequency resonant circuit is constructed in a differential architecture in order to create a number "virtual ground" points within the circuit that nearly eliminate any ground currents, and thus minimize the time required to switch the resonant circuit between the two LO frequencies. The switching between two resonant frequencies is achieved by creating a short circuit across certain components within the circuit to eliminate them from the resonant circuit. The combination of the differential architecture dual-frequency resonant circuit with a single VCO provides for the power efficient and space-saving generation of both LO frequencies needed for a wireless transceiver. Moreover, by requiring only one resonant circuit, the area on the circuit board within the wireless transceiver is greatly reduced, resulting in a smaller transceiver circuit.

摘要翻译： 本发明包括具有能够在两个谐振频率之间快速切换以便产生两个不同LO频率的谐振电路的压控振荡器（VCO）。 在优选实施例中，本发明包括具有连接到VCO的谐振电路输入引线的双频谐振电路的VCO。 双频谐振电路构造在差分架构中，以在电路内创建几乎消除任何接地电流的数个“虚拟接地”点，从而最小化在两个LO频率之间切换谐振电路所需的时间。 在两个谐振频率之间的切换通过在电路内的某些组件产生短路来消除谐振电路而实现。 差分架构双频谐振电路与单个VCO的组合提供无线收发器所需的两个LO频率的功率效率和节省空间的生成。 此外，只需要一个谐振电路，无线收发器内的电路板上的区域就大大减少，从而产生较小的收发电路。