Switched reactance modulated E-class oscillator
US7005935B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 19, 2004 |
| Grant date | Feb 28, 2006 |
| Priority date | — |
| Expiry date | Mar 19, 2024 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/3727
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A modulated Class E oscillator. In one embodiment, the modulated Class E oscillator may achieve high coil currents (about 1A) and voltages (about 500V) with low power components. Current may be injected when the oscillating current in the inductor passes through zero. A detector circuit may be used to trigger the current injection at the appropriate instant regardless of changes in the resonant frequency of the system. Its phase can be adjusted to compensate for propagation delays in the drive circuitry, while amplitude modulation is accomplished by switching in additional reactive conductance to increase the current injected into the tank circuit. Frequency modulation is accomplished in an alternate embodiment. The oscillator can also lock to an external reference signal and be phase modulated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.