公开(公告)号：US07751792B2

公开(公告)日：2010-07-06

申请号：US11086045

申请日：2005-03-22

申请人： Lawrence E. Connell ,  David P. Kovac ,  Poojan A. Wagh ,  Vikram B. Karnani ,  William T. Waldie ,  Tao Wu

发明人： Lawrence E. Connell ,  David P. Kovac ,  Poojan A. Wagh ,  Vikram B. Karnani ,  William T. Waldie ,  Tao Wu

IPC分类号： H04B1/26

CPC分类号： H03D7/1441 ,  H03D7/1458 ,  H03D7/1466 ,  H03D7/165 ,  H03D2200/0084 ,  H03D2200/0088

摘要： Transmission of a high frequency signal is provided by a passive mixer. The passive mixer receives a low frequency signal as an input. The passive mixer includes a plurality of transistors each with a gate, a source, and a drain. The passive mixer also includes a local oscillator connected to the gates of the transistors. The gates of the transistors are also connected to a DC bias proportional to the threshold voltage of the transistors. In addition, an output of the passive mixer may be attenuated by a passive attenuator wherein both the passive attenuator and passive mixer are substantially free of quiescent current.

摘要翻译： 高频信号的传输由无源混频器提供。 无源混频器接收低频信号作为输入。 无源混频器包括多个晶体管，每个具有栅极，源极和漏极。 无源混频器还包括连接到晶体管的栅极的本地振荡器。 晶体管的栅极也连接到与晶体管的阈值电压成比例的DC偏置。 此外，无源混频器的输出可以被无源衰减器衰减，其中无源衰减器和无源混频器都基本上没有静态电流。

公开(公告)号：US06487398B1

公开(公告)日：2002-11-26

申请号：US09929578

申请日：2001-08-14

申请人： Dan Nobbe ,  Dale Schwent ,  David P. Kovac ,  Vikram Karnani

发明人： Dan Nobbe ,  Dale Schwent ,  David P. Kovac ,  Vikram Karnani

IPC分类号： H01Q1112

CPC分类号： H04B1/0475

摘要： A low noise direct conversion transmitter architecture without a post-PA filter is described. A high power/low noise differential LO (110), controlled by a near unity divide ratio PLL (112) for re-modulation protection, is coupled a polyphase quadrature generator (120) generating amplitude-balanced and phase-shifted limited differential LO signals. The quadrature mixers (130 and 132) receive the limited differential LO signals and the filtered differential baseband signals to produce up-converted differential signals. The combiner (168) receives the up-converted differential signals and combines them to produce a differential RF transmission signal. A VCA (174) amplifies the differential RF transmission signal, and the resulting differential signal is converted to a single-ended RF transmission signal through a balun (180). A linear amplifier (184) is coupled to the single-ended RF transmission signal for amplification before radio transmission by an antenna (188).

摘要翻译： 描述了没有后置PA滤波器的低噪声直接转换发射机架构。 由用于再调制保护的接近单位分频比P​​LL（112）控制的高功率/低噪声差分LO（110）被耦合到产生幅度平衡和相移限制差分LO信号的多相正交发生器（120） 。 正交混频器（130和132）接收限制的差分LO信号和滤波的差分基带信号以产生上变频的差分信号。 组合器（168）接收上变频的差分信号并将其组合以产生差分RF传输信号。 VCA（174）放大差分RF传输信号，所得到的差分信号通过平衡 - 不平衡变换（180）转换为单端RF传输信号。 线性放大器（184）耦合到单端RF发射信号，用于在由天线（188）进行无线电传输之前进行放大。