Oscillator circuit, oscillator circuit adjusting method, and mass measuring apparatus using oscillator circuit
US7046096B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 15, 2004 |
| Grant date | May 16, 2006 |
| Priority date | — |
| Expiry date | May 29, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/0995
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An oscillator circuit is a closed loop including an amplifying circuit and a feedback circuit. The amplifying circuit includes a pair of amplifiers, which also function as impedance buffers, and a first phase-shift circuit. The feedback circuit includes a second phase-shift circuit and a piezoelectric vibrator. The second phase-shift circuit is capable of adjusting the phase and gain of the feedback circuit. The first phase-shift circuit of the amplifying circuit is arranged between the pair of amplifiers and is separated, in terms of impedance, from the second phase-shift circuit. The first phase-shift circuit is capable of adjusting the phase of the entire closed loop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.