Title:
FREQUENCY DIVIDER
Document Type and Number:
Japanese Patent JP2543290
Kind Code:
B2
Abstract:
PURPOSE: To provide a frequency divider capable of highly accurately setting up frequency while holding high loop gain by the small number of frequency divider steps and accelerating a channel switching time for a synthesizer without increasing the size of a circuit.
CONSTITUTION: A fractional frequency divider is constituted of a counter 10, a shift register 12 for inputting a counter output signal as a clear signal and inputting a counter input signal as a clock and an AND circuit 11 for inputting an output signal from the register 12 and the counter input signal. When both coefficients of a denominator and a numerator for the frequency divider concerned are simultaneously controlled, the channel switching time of the synthesizer can be accelerated without increasing the size of the circuit.
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Inventors:
YABUKI HIROYUKI
MAKIMOTO MITSUO
MAKIMOTO MITSUO
Application Number:
JP16883192A
Publication Date:
October 16, 1996
Filing Date:
June 26, 1992
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
H03K23/00; H03K5/156; H03L7/197; (IPC1-7): H03L7/197; H03K5/156; H03K23/00
Domestic Patent References:
| JP55664A |
Attorney, Agent or Firm:
Tomoyuki Takimoto