Single ended to differential converter and 50% duty cycle signal generator and method
US5896053A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 13, 1997 |
| Grant date | Apr 20, 1999 |
| Priority date | — |
| Expiry date | Jun 13, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/151
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A high frequency, current mode, single-ended-to-differential signal converter with low input impedance constant to very high frequencies and a balanced output signal even for large signals. A wide range of input voltages may be accommodated and a d.c. offset correction added. A circuit for achieving a precise fifty percent duty cycle digital signal is disclosed. A circuit for ensuring a 90.degree. phase differential between two signals needed for quadrature multiplication is disclosed. Unusual precision in phase control of the quadrature signals needed for modulation and demodulation of wireless signals is obtained by the use of feedback circuits in both the duty cycle generator and phase shifter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.