Variable phase shifter and method
US5926052A · kind A · utility
8Cited by
15References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1997 |
| Grant date | Jul 20, 1999 |
| Priority date | — |
| Expiry date | Aug 8, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D7/165
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit and method for producing a phase shifted quadrature signal (VOUT) from an in-phase signal (VIN). The in-phase signal (VIN) is applied to the control electrode of a voltage follower (121). The voltage follower (121) has a variable output resistance which combines with a capacitor (123) to delay the input signal (VIN) in accordance with the time constant formed by the variable output resistance and the capacitor (123). The variable output resistance is controlled by adjusting the bias current of the voltage follower (121) with a control signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.