Title: Mos varactor and voltage-controlled oscillator using the same
Application Number: 200610054962 Application Date: 2006.02.27
Publication Number: 1829074 Publication Date: 2006.09.06
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03B5/12,H03B5/32,H03B5/04
Applicant(s) Name: Matsushita Electric Ind Co., Ltd. Address:
Inventor(s) Name: Masai Shigeo, Tateyama Yuichi, Otsuka Takashi
Attorney & Agent: huang xiaolin wang zhisen
Abstract:
     Provided is a MOS varactor in which oscillation frequency variation is small and variation in a capacitance changing voltage is small, and a voltage-controlled oscillator using the MOS varactor, as a load capacitor of an oscillating circuit composed of a feedback resistor 1 , an amplifier 2 , and a crystal vibrator 3 , a variable electrostatic capacitor, which is generated between drain/source terminals and a gate terminal of each of MOS transistors 5 a and 6 a each of which source and drain terminals are short-circuited, is connected. A bulk terminal of each of the MOS transistors 5 a and 6 a is connected to one terminal of a resistor 19 , a voltage is applied to the other terminal of the resistor 19 , the bulk terminal of each of the MOS transistors 5 a and 6 a is connected to one terminal of a capacitor 20 , and the other terminal of the capacitor 20 is grounded.
Time: 7
<- Previous Patent:Temperature-compensated piezoelec...   |  Next Patent:Oscillating buffer ->