Voltage controlled oscillator with controlled capacitance ratio in positive feedback loop to broaden bandwidth
US5160902A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1991 |
| Grant date | Nov 3, 1992 |
| Priority date | — |
| Expiry date | Jul 9, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B2201/033
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A voltage controlled oscillator comprises a resonant circuit having at least a coil and a first variable capacitance diode, and resonating within predetermined variable frequency ranges; and an active circuit having an input, an output, and an active element connected between the input and the output, the input being connected to the resonant circuit in order to receive a resonant output therefrom. A variable capacitance ratio circuit, having a second variable capacitance diode and at least one capacitor, is connected in a positive feedback manner, between the input and the output of said active circuit means in order to oscillate the active element of the active circuit at a resonant frequency of the resonant circuit, between the input and the output of the active circuit. A variable controller is provided for changing a resonant frequency of the resonant circuit, to thereby apply a control voltage to the first and second variable capacitance diodes and to control a capacitance ratio between the at least one capacitor and the second variable capacitance diode in the variable capacitance ratio circuit, so that an oscillator frequency of the active element can be changed substantial…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.