Constant current source stabilized semiconductor oscillator
US4208639A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 16, 1978 |
| Grant date | Jun 17, 1980 |
| Priority date | — |
| Expiry date | Jun 16, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L1/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A crystal controlled oscillator has a substantially stable frequency in an environment of wide power supply potential changes. A first CMOS device of a pair is coupled to a crystal network and operates as a substantially small signal linear amplifier. A second CMOS device of the pair forms a constant current source for the first device by means of a plurality of diodes coupled in series circuit between two terminals of the second device to produce a substantially constant biasing potential for the second device only when the potential of the power supply exceeds the value of the diode drop potentials. In this manner, the voltage across the oscillator is relatively independent of power supply voltage changes to provide frequency stability over those changes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.