Crystal driver circuit configurable for daisy chaining
US10454420B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 10, 2017 |
| Grant date | Oct 22, 2019 |
| Priority date | — |
| Expiry date | Jan 1, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B2200/0066
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A crystal driver integrated circuit configurable for daisy chaining including an amplifier core, an input pin and an output pin, and a controller that operates the amplifier core in any one of multiple operating modes. The operating modes include an oscillator mode for driving an external crystal coupled between the input and output pins to generate an oscillation signal at a target frequency, and an amplifier mode that amplifies an external oscillating signal provided to the input pin to provide an amplified oscillation signal on the output pin. The amplifier core includes a controllable current source that provides a core bias current to an amplifier having a level that is adjusted depending upon the operating mode and desired amplitude. The operating modes may include a bypass mode in which the amplifier core is disabled. The amplifier may be implemented as either an PMOS amplifier or an NMOS amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.