Voltage-controlled oscillator methods and apparatus
US7728674B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 2006 |
| Grant date | Jun 1, 2010 |
| Priority date | — |
| Expiry date | Dec 14, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2005/00234
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Methods and apparatus are provided for generating a clock signal with relatively high bandwidth and relatively low phase noise. A circuit of the invention can include a pair of transistors serially coupled between a signal of relatively high voltage and a source of relatively low voltage, where a voltage of the signal of relatively high voltage can vary according to a voltage of a variable control signal. A gate of one of the pair of transistors can be coupled to an input clock signal, and an output node between the pair of transistors can be coupled to an output clock signal. The circuit can also include a third transistor, whose drain and source are coupled to the output clock signal, and whose gate can be coupled to a gear input signal. This circuit can advantageously operate under at least two different gears, each with different bandwidth and phase noise characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.