Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
SYNTHESIZER FOR RADIO EQUIPMENT FOR FREQUENCY HOPPING
Document Type and Number:
Japanese Patent JPH0983472
Kind Code:
A
Abstract:

To provide a synthesizer reducing the frequency changeover of the frequency hopping radio equipment.

The synthesizer is provided with a D/A converter 2 operated in a switching timing based on a switching pattern of a prescribed frequency, a voltage controlled oscillator 3 operated by an output of the D/A converter 2, and a phase locked loop circuit 5. Furthermore, in the synthesizer 6 for the frequency hopping radio equipment switching in time division a transmission frequency into a reception frequency, a sample-and-hold circuit 8 is provided between the D/A converter 2 and the voltage controlled oscillator 3 and a control voltage is held by the sample-and-hold circuit 8 based on frequency data before changeover of the D/A converter 2. When the D/A converter 2 reaches the control voltage based on the frequency data after the changeover in the switching timing, the sample-and-hold circuit 8 is operated to switch the frequency of the synthesizer.


Inventors:
KISHI HIDEKI
IDE TERUJI
Application Number:
JP1995000263719
Publication Date:
March 28, 1997
Filing Date:
September 19, 1995
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
KOKUSAI ELECTRIC CO LTD
International Classes:
H03L7/187; H04J1/00; H04J4/00; (IPC1-7): H04J1/00; H03L7/187; H04J4/00
Attorney, Agent or Firm:
大塚 学