公开(公告)号：US5263197A

公开(公告)日：1993-11-16

申请号：US762759

申请日：1991-09-20

申请人： Yoshiharu Manjo ,  Charles R. McMurray ,  Tadashi Ohga

发明人： Yoshiharu Manjo ,  Charles R. McMurray ,  Tadashi Ohga

IPC分类号： H03B1/00 ,  H03B5/36 ,  H03B19/14 ,  H03B25/00 ,  H03D7/16 ,  H03J5/02 ,  H04B1/28 ,  H04B1/30 ,  H04B1/26

CPC分类号： H03J5/0272 ,  H03B25/00 ,  H04B1/28 ,  H04B1/30 ,  H03B19/14 ,  H03B2201/011 ,  H03B2201/0208 ,  H03B5/362 ,  H03D7/16

摘要： A two-stage direct conversion receiver. A first mixer (13) converts the incoming signal to an intermediate frequency (IF) signal. A second mixer (16) converts the IF signal to a baseband signal. A detector (17), receiver logic circuit (18), and alerting device circuit (19) act upon the baseband output signal. A two port oscillator (14) provides a fundamental frequency output (FO) and a tripled output frequency (3 FO). The tripled output frequency is again tripled (9 FO) by a frequency multiplier (15) and is provided as a mixing signal to the first mixer (13). The fundamental frequency output is provided to a phase locked loop (20, 21, 22). The output frequency (FV) of the phase locked loop is doubled (2 FV) by a frequency multiplier (23) and provided to a phase shift circuit (24). The output of the phase shift circuit (24) is provided as the second mixing signal to the second mixer (16). The phase locked loop comprises a phase locked loop controller (20), a phase locked loop filter (21), and a voltage controlled oscillator (22). The main oscillator (14) is configured as a crystal controlled Colpitts oscillator, which has an emitter resonant circuit selected to produce oscillation at the fundamental frequency, and a collector resonant circuit selected to extract the third harmonic of the fundamental oscillation frequency. A single active device can therefore provide both the fundamental frequency and the third harmonic frequency. Calibration of the receiver is effected by simply tuning the oscillator (14) to produce a baseband output signal at the output of the second mixer (16). Single step calibration is therefore effected because the voltage controlled oscillator (22) is locked to the main oscillator (14).

摘要翻译： 两级直接转换接收机。 第一混频器（13）将输入信号转换成中频（IF）信号。 第二混频器（16）将IF信号转换为基带信号。 检测器（17），接收器逻辑电路（18）和报警装置电路（19）作用于基带输出信号。 双端口振荡器（14）提供基频输出（FO）和三倍输出频率（3 FO）。 倍增输出频率由倍频器（15）再三倍（9F），并作为混合信号提供给第一混频器（13）。 基频输出被提供给锁相环（20,21,22）。 锁相环的输出频率（FV）由倍频器（23）加倍（2 FV），并提供给相移电路（24）。 将相移电路（24）的输出作为第二混频信号提供给第二混频器（16）。 锁相环包括锁相环控制器（20），锁相环滤波器（21）和压控振荡器（22）。 主振荡器（14）被配置为晶体控制的Colpitts振荡器，其具有选择用于产生基频振荡的发射极谐振电路和选择为提取基波振荡频率的三次谐波的集电极谐振电路。 因此，单个有源器件可以提供基频和三次谐波频率。 通过简单地调谐振荡器（14）来在第二混频器（16）的输出处产生基带输出信号来实现接收机的校准。 因此，单步校准是因为压控振荡器（22）被锁定到主振荡器（14）。