Multi-band voltage controlled oscillator in which unnecessary circuit parasitics can be avoided
US6194974A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 23, 1999 |
| Grant date | Feb 27, 2001 |
| Priority date | — |
| Expiry date | Jul 23, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B2201/0258
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a voltage controlled oscillator in which an operation frequency is determined by applying a tuning voltage to a resonant circuit connected to a control terminal of a transistor (T1), the resonant circuit has zeroth and first varactor diodes (D0, D1) which can serve as capacitance elements. A selection voltage is applied to an anode of the first varactor diode through a band selection terminal (1). The first vatactor diode has a capacitance varying in response to the value of the selection voltage. The variation of the capacitance causes a change of a frequency band of the voltage controlled oscillator. A tuning voltage is applied through a tuning terminal (2).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.