Voltage-controlled oscillator

Application Number: 00107273
Application Date: 2000.04.29
Publication Number: 1272725
Publication Date: 2000.11.08
Priority Information: 1999/4/30 JP 124163/1999
International: H03B5/02;H03L7/099
Applicant(s) Name: NEC Corp.
Inventor(s) Name: Tanioto Shin
Patent Agency Code: 11219
Patent Agent: mu dejun
Abstract A voltage-controlled oscillator 3 is constructed with a ring oscillator control circuit 2 and a ring oscillator 1, which is constructed with a plurality of differential amplifiers 5 to 8 each including a differential pair of transistors 24 and 25 and load circuits 22 and 23 connected to the respective transistors. The load circuits 22 and 23 are constructed such that the differential amplifiers always operate in linear region according to load drive voltages CL1 and CL2.