Voltage control oscillation circuit using CMOS
US5818306A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 1997 |
| Grant date | Oct 6, 1998 |
| Priority date | — |
| Expiry date | Jul 15, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B2202/06
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A voltage control oscillation circuit for a CMOS which is capable of reducing phase noise and power consumption by adapting a voltage amplitude control loop and a common mode feedback circuit to a conventional LC-tank circuit. The circuit includes an LC-tank oscillation unit for outputting an oscillation voltage, an output common mode feedback unit for receiving an output from the LC-tank oscillation unit and eliminating a common mode noise of the output, and a voltage amplitude control unit for controlling a bias current of the LC-tank oscillation unit in accordance with a voltage difference at both ends of an LC-tank oscillation terminal which voltage is applied thereto through the output common mode feedback unit, for thus controlling the amount of an oscillation voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.