公开(公告)号：WO1996038924A1

公开(公告)日：1996-12-05

申请号：PCT/US1996005610

申请日：1996-04-22

Applicant: MOTOROLA INC.

Inventor： MOTOROLA INC. ,  JAFFEE, James, I.

IPC: H04B01/16

CPC classification number: H03D3/007 ,  H04B1/30

Abstract: A low power zero-IF selective call receiver has a local oscillator (106) that generates an injection signal for a first mixer (104) and a pair of quadrature phase related injection signals (122, 124) for a pair of second mixers (112, 114). The first mixer converts the received carrier signal (102) to an intermediate signal (108). A digital phase shifter/divider (116) coupled to the local oscillator (106) generates the pair of quadrature phase related injection signals (122, 124) at the frequency of the intermediate signal (108) which also equals the frequency of the local oscillator (106) divided by an integer greater than 1. The pair of second mixers (112, 114) coupled to the digital phase shifter/divider (116) converts the in and quadrature phase components (122, 124) of the intermediate signal (108) to respective in and quadrature phase baseband signals (126, 128).

Abstract translation: 低功率零中频选呼接收机具有本地振荡器（106），其产生用于第一混频器（104）的注入信号和用于一对第二混频器（112）的一对正交相位相关注入信号（122,124） ，114）。 第一混频器将接收到的载波信号（102）转换成中间信号（108）。 耦合到本地振荡器（106）的数字移相器/分频器（116）以中间信号（108）的频率产生一对正交相位相关的注入信号（122,124），其也等于本地振荡器的频率 （106）除以大于1的整数。耦合到数字移相器/分频器（116）的一对第二混频器（112,114）将中间信号（108）的输入和正交相位分量（122,124）转换 ）到相位和正交相位基带信号（126,128）。