Techniques for generating two high frequency signals with a constant phase difference over a wide frequency band
US5391996A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1993 |
| Grant date | Feb 21, 1995 |
| Priority date | — |
| Expiry date | Nov 19, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/23
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Apparatus for generating two output signals with a selective predetermined constant phase difference therebetween from an input reference signal having a predetermined frequency and phase includes, in one embodiment, a first and a second Programmable Delay, and a first and a second Synthesizer. The input reference signal is provided as separate inputs to the first and second Programmable Delays which generate first and second output signals, respectively, with selective predetermined delay differences therebetween for transmission to the respective first and second Synthesizers. Each of first and second Synthesizers are phase locked loops with a Programmable Divider and an optional Prescaler added to the loop to divide a high frequency output signal generated by a Voltage Controlled Oscillator (VCO) to a frequency of the output signal from the associated Programmable Delay in order to correct for any phase difference between the output signal of the VCO and the input signal from the Programmable Delay. Various embodiments are provided that include a control loop that operates on the first and second output signals to generate a control signal to one of the Programmable Delays for m…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.