公开(公告)号：US5828955A

公开(公告)日：1998-10-27

申请号：US521568

申请日：1995-08-30

申请人： Joseph T. Lipowski ,  Dennis Michael Cleary

发明人： Joseph T. Lipowski ,  Dennis Michael Cleary

IPC分类号： H03D3/00 ,  H04B1/26 ,  H04B1/30

CPC分类号： H03D3/009 ,  H03D3/008 ,  H04B1/30 ,  H04B1/26

摘要： A low cost, high performance near direct conversion FM receiver having a single local oscillator is configured to equalize in-phase and quadrature-phase IF signals. The receiver includes a downconverter and a processor. The downconverter receives an RF signal and downconverts the RF signal to an in-phase IF signal (IF.sub.I) and a quadrature-phase IF signal (IF.sub.Q). The processor digitizes IF.sub.I and IF.sub.Q, corrects these signals so that they are substantially equal in magnitude and substantially 90.degree. out of phase, and then downconverts the IF signals to baseband signals (I, Q).

摘要翻译： 具有单个本地振荡器的低成本，高性能近距离直接转换FM接收机被配置为对同相和正交相IF信号进行均衡。 接收机包括下变频器和处理器。 下变频器接收RF信号并将RF信号下变频为同相IF信号（IFI）和正交相IF信号（IFQ）。 处理器对IFI和IFQ进行数字化，校正这些信号，使得它们的幅度基本相等，基本相差90°，然后将IF信号下变频为基带信号（I，Q）。