Non-linear control circuit
US4230953A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 31, 1978 |
| Grant date | Oct 28, 1980 |
| Priority date | — |
| Expiry date | Jul 31, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B5/366
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A low-Q mechanical resonator is operated in its series resonance mode in a circuit that includes an amplifier and voltage variable phase shifter. As the phase shift is varied, the resonator will shift its frequency to compensate the phase shift. The result is a voltage variable oscillator frequency. The low-Q resonator has a non-linear phase versus frequency characteristic so that frequency is not a linear function of control voltage. A plural emitter transistor is employed in one side of a non-linear differential control amplifier. The resulting non-linear transfer characteristic is used to compensate the non-linear oscillator characteristic so that the frequency versus control voltage is linear.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.