Title:
VOLTAGE-CONTROLLED OSCILLATOR THAT OPERATES WITH DIGITAL CONTROL LOAD IN PHASE-LOCKED LOOP
Document Type and Number:
Japanese Patent JPH07307665
Kind Code:
A
Abstract:
PURPOSE: To realize a phase locked loop operating with desired frequencies without depending on the fluctuation of temperature or a process. CONSTITUTION: This phase locked loop 10 operates without depending on the fluctuation of temperature or a process by digitally adding a load 38 to a VCO 22 until a desired operating frequency is obtained. Plural current mirrors 164-166 are controlled for increasing the switching currents of an invertor in a VCO so that the VCO can reach a high output frequency in a process in the worst case without delaying a response to a loop node voltage 18 of the VCO. A frequency range detector 34 monitors the output frequency of the VCO, transmits a control signal to a load control circuit 38, activates a digital load, and decrease the VCO to the desired operating frequency.
Inventors:
AAMATSUDO EICHI ATORISU
BENJIYAMIN SHII PIITAASON
RANII ERU PAAKAA
BENJIYAMIN SHII PIITAASON
RANII ERU PAAKAA
Application Number:
JP31114093A
Publication Date:
November 21, 1995
Filing Date:
November 17, 1993
Export Citation:
Assignee:
CODEX CORP
International Classes:
H03L7/113; H03K3/03; H03K3/354; H03L7/08; H03L7/099; H03L7/10; H03L7/191; (IPC1-7): H03L7/113; H03L7/10
Attorney, Agent or Firm:
Yoshiaki Ikeuchi
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