Patent Number: 6,798,011

Title: Multi-terminal MOS varactor

Abstract: In a multi-terminal MOS varactor, a floating electrode 8 of a MOS capacitor (Cf) 5 is connected to one of two terminals of each of a plurality of capacitors (C1-Cn) 6-1 through 6-n. To the other terminals (Vg1-Vgn) 9-1 through 9-n of the respective capacitors (C1-Cn) 6-1 through 6-n, control voltages Vg1-Vgn are applied, and a terminal (Vn) 11 of the MOS capacitor (Cf) 5, the terminal being on the side of a well, receives a control voltage. In the multi-terminal MOS varactor with the arrangement above, it is possible to progressively change the valid electrostatic capacity C of the other terminal (Vgj) 9-j of an arbitrary capacitor (Cj) 6-j, by changing the control voltage. Since electrostatic capacity can be progressively changed in this MOS varactor, adopting this MOS varactor to an oscillator enables to control a frequency and sensitivity of the oscillator.

Inventors: Adan; Alberto Oscar (Ikoma, JP)

Assignee: Sharp Kabushiki Kaisha

International Classification: H01L 29/66 (20060101); H01L 29/94 (20060101); H03B 5/08 (20060101); H03B 5/12 (20060101); H03L 7/08 (20060101); H03L 7/099 (20060101); H01L 029/94 ()

Expiration Date: 09/22016