Voltage controlled oscillator including a plurality of buffer circuits diodes, current sources, MIS capacitors
US6081166A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 14, 1998 |
| Grant date | Jun 27, 2000 |
| Priority date | — |
| Expiry date | Aug 14, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/0995
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A voltage controlled oscillator which causes little interference to and receives little interference from other circuits via a parasitic capacitance of an integrated capacitor, has a good control linearity, and is capable of being used over a wide range of frequency including ultra high frequencies, constituting a ring oscillator by being provided with three or more logic buffer circuits having differential input and output terminals cascade connected at the differential inputs and outputs and making the n-th differential output a negative feedback to the terminal of the 1st differential input. Each of the logic buffer circuits comprises a differential transistor pair comprised of first and second transistors, first and second diode array each comprising at least one diode, first and second integrated capacitors, and a current source for frequency control. The sum of emitter currents of the pair of the differential transistors is set by the current source for frequency control. The collector terminals are connected to the first and second diode arrays and terminals of the first and second integrated capacitors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.