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| Optoelectronic switching and display device with porous silicon |
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| Structure and method for manufacturing improved FETs having T-shaped gates |
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| Method of fabricating a self-aligned silicide MOSFET |
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Universal frequency synthesizer
| Details |
Inventors: Howk, Max E.; Slentz, Gale E.; Grillot, Ronald E.;
Assignee: King Radio Corporation (Olathe, KS)
Primary Examiner: Krawczewicz; Stanley T.
Assistant Examiner:
Attorney, Agent or Firm: Lowe, Kokjer, Kircher, Wharton & Bowman
This invention relates in general to a universal frequency synthesizer which is suitable for use in a phase-locked loop frequency synthesizer system comprising a voltage controlled oscillator, a reference oscillator and a low pass filter. The universal frequency synthesizer of the present invention is basically comprised of programmable divider circuitry and a phase detector. The universal frequency synthesizer is arranged to receive tuning data in serial format from an external source. The received tuning data is permanently stored within the universal frequency synthesizer and is used to establish the division ratio by which the output signal produced by the synthesizer's attendant voltage controlled oscillator and the reference signal produced by the synthesizer's attendant reference oscillator are divided before being provided to the signal and comparison inputs of the phase detector, respectively. In this way, the frequency of the output signal from the synthesizer's attendant voltage controlled oscillator may be changed by simply changing the tuning data stored with the device. |
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DETAILED DESCRIPTION OF THE INVENTION In the accompanying drawing, which forms a part of the specification and are to be read in conjunction therewith and in which like reference numerals are employed to indicate like parts in the various views: FIG.
1 is a block diagram of a universal frequency synthesizer of the present invention; FIGS.
2a, b, c and d are to be arranged to provide a detailed schematic diagram of the universal frequency synthesizer of the present invention; and FIGS.
2e is a plot showing how FIGS.
2a, b, c and d are to be arranged for proper viewing.
The universal frequency synthesizer of the present invention is arranged to serve as one of the major building blocks of a phase-locked loop frequency synthesizer.
In particular, this device comprises a voltage controlled oscillator prescaler and programmable divider, a programmable reference divider, a means for programming the reference dividers, and a phase detector which are integral components of every phase-locked loop system.
The other elements typically found in a a phase-locked loop frequency synthesizer include a voltage controlled oscillator which is capable of producing an output signal having a frequency determined by the voltage of an input signal provided to its control input, a reference oscillator which is operable to produce a reference signal of a predetermined frequency, and a low pass filter which is capable of filtering the phase detector output voltage signal provided to the control input of the voltage controlled oscillator.
These elements are of a conventional design which is well known to those of ordinary skill in the art.
In addition, the interconnection of these elements with each other and with the universal frequency synthesizer of the present invention will be readily apparent to those having ordinary skill in the art.
Reference is now made to the figures wherein a block diagram of the universal frequency synthesizer of the present invention is shown in FIG.
1.
As shown in this figure, the universal frequency synthesizer includes a 19 bit shift register 10 and a 19 bit latch 12 for receiving and storing the tuning data used to control the condition of the device
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Quantum Computing 
