公开(公告)号：US5697068A

公开(公告)日：1997-12-09

申请号：US490876

申请日：1995-06-15

申请人： Raul Salvi ,  John Wetters ,  Wayne Phang

发明人： Raul Salvi ,  John Wetters ,  Wayne Phang

IPC分类号： H03B1/00 ,  H03C3/09 ,  H03L7/18 ,  H04B1/40

CPC分类号： H03C3/0983 ,  H03C3/0941 ,  H03C3/0958 ,  H03C3/0966 ,  H03L7/18 ,  H04B1/40 ,  H03B2201/0208

摘要： A transceiver synthesizer includes components that enable it to be tuned non-invasively by software. The transceiver synthesizer includes a non-volatile memory (30) that can be non-invasively programmed with a digital value for each of a number of tuning variables. The digital values are converted by digital to analog converters (37, 38, 39) into tuning voltages. The tuning voltages are applied to voltage variable devices (60, 80, 95) that respond to changes in the applied tuning voltage to vary an operating characteristic thereof. The operating characteristics of the voltage variable devices (60, 80, 95) are non-invasively adjustable to tune the transceiver synthesizer for high and low port modulation deviation, reference oscillator make tolerance, automatic frequency control, reference oscillator temperature compensation etc.

摘要翻译： 收发器合成器包括能够通过软件非侵入性地调整的组件。 收发器合成器包括非易失性存储器（30），其可以用多个调谐变量中的每一个的数字值进行非侵入式编程。 数字值由数模转换器（37,38,39）转换成调谐电压。 调谐电压被施加到对施加的调谐电压的变化作出响应以改变其工作特性的电压可变器件（60,80,95）。 电压可变器件（60,80,95）的工作特性是非侵入式可调的，以调谐收发器合成器的高低端调制偏差，参考振荡器允差，自动频率控制，参考振荡器温度补偿等。

公开(公告)号：US5701600A

公开(公告)日：1997-12-23

申请号：US502997

申请日：1995-07-17

申请人： John Wetters ,  John Wayne Simmons ,  Virgilio Alejandro Fernandez ,  Art Ahrens ,  Steve Carsello

发明人： John Wetters ,  John Wayne Simmons ,  Virgilio Alejandro Fernandez ,  Art Ahrens ,  Steve Carsello

IPC分类号： H03J1/00 ,  H04B1/16

CPC分类号： H03J1/0008 ,  H03J2200/28

摘要： A method of calibrating a radio receiver (100) which has a desired IF center frequency (fo) includes generating and applying to the receiver's demodulator (126) a plurality of reference signals. The demodulated reference signals are used to generate, for the demodulator, a transfer function that is predictive of amplitude versus frequency characteristics of signals to be demodulated by the demodulator (126). The transfer function (202) is used to determine a frequency offset between a received signal's intermediate frequency and the desired frequency fo. The determined frequency offset is used to adjust the IF frequency of the received signal towards the desired frequency fo. The adjustment process preferably continues until the frequency offset is below a desired threshold. A receiver using the disclosed method is also described.

摘要翻译： 校准具有期望的IF中心频率（fo）的无线电接收机（100）的方法包括生成并向接收机的解调器（126）应用多个参考信号。 解调的参考信号用于为解调器产生预测由解调器（126）解调的信号的幅度 - 频率特性的传递函数。 传递函数（202）用于确定接收信号的中间频率和期望频率fo之间的频率偏移。 所确定的频率偏移用于将接收到的信号的IF频率调整到期望的频率fo。 调整过程优选地继续直到频率偏移低于期望的阈值。 还描述了使用所公开的方法的接收机。