Title:
RADIO SELECTIVE CALL RECEIVER
Document Type and Number:
Japanese Patent JP3048136
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a radio selective call receiver where components of terminal receivers with different frequency bands are used in common for manufacturing and the production management is facilitated.
SOLUTION: When reception of an output frequency of a VCO 20 which is controlled by a PLL 30 at 150 MHz and 300 MHz bands, a current source 16 is supplied to a buffer circuit or a 2-multiple circuit 13, and control voltage sources 17a, 18a, 17b and 18b are applied to phase shifters 11, 12 to give the output frequency of the VCO 20 to the phase shifters 11, 12 via a buffer circuit 14 or a 2-multiple circuit 13 so as to apply a local I signal and a local Q signal, the phases of which differ by 90 degrees, to mixers 3, 4. When signals are received at 150 MHz, 300 MHz bands, the mixers 3, 4 mix the received signals and the local I signal and the local Q signal to provide an output of a base-band signal.
Inventors:
Hiroshi Kudo
Application Number:
JP36537497A
Publication Date:
June 05, 2000
Filing Date:
December 18, 1997
Export Citation:
Assignee:
NEC
International Classes:
H04B1/26; H03D7/16; H03J5/02; H04B1/16; H04B1/30; H04L27/14; H04W84/02; H04W88/02; (IPC1-7): H04B1/26; H03J5/02; H04B1/16; H04L27/14; H04Q7/14
Domestic Patent References:
| JP5252070A |
Attorney, Agent or Firm:
Shigeru Noda
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