Voltage controlled oscillator with linear characteristic
US4492934A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 5, 1982 |
| Grant date | Jan 8, 1985 |
| Priority date | — |
| Expiry date | Feb 5, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B2200/0092
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A voltage controlled oscillator is provided with an LC parallel resonance circuit connected to the collector of one of a differential pair of transistors, and an amplifier and a capacitor which are connected between the collector of the one transistor and the base of the other transistor. The bases of the differential pair of transistors are equally biased. The emitters of the transistors are connected to a variable current source. The variable current source produces a current proportional to the square of control voltage. The frequency of the VCO can be changed by the control voltage with good linearity over a wide dynamic range. The variable current source causes the VCO characteristic to be linear. The value of the capacitor can be small, making the oscillator circuit well suited for integrated circuit fabrication.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.