Device, system and method to provide different bias voltages and common tuning voltage
View Patent ↗In some embodiments of the present invention, multiple voltage controlled capacitor branches may be employed in a tuning circuit. Each of the multiple voltage controlled capacitors branches may be set to somewhat apart resonance frequency so that a composite resonance derivative curve forms an equi-ripple curve with an improved tuning sensitivity linearization.
1. A method comprising:
providing different bias voltages to at least first and second, different, branches of voltage-controlled capacitors in a tuning circuit, by passing a current through a voltage splitter arrangement having a plurality of resistors, and
providing a common tuning voltage to said different branches to shift a working point of a gate of a first voltage controlled capacitor of said first branch relative to a working point of a gate of a second voltage controlled capacitor of said second branch.
2. The method of claim 1 , wherein said voltage-controlled capacitors are metal-oxide semiconductor field-effect-transistor voltage-controlled capacitors.
3. The method of claim 1 , further comprising providing different bias voltages to achieve a desired derivative-of-tuning-frequency of a tuning voltage graph of said tuning circuit.
4. The method of claim 3 , comprising providing different bias voltages to achieve an equi-ripple derivative-of-tuning-frequency of said tuning voltage graph.
5. The method of claim 1 further comprising providing said different bias voltages evenly shifted from each other.
6. The method of claim 1 further comprising providing said different bias voltages to compensate for temperature variance in said tuning circuit.
7. A tuning circuit comprising:
a first branch comprising an inductor;
a second and a third branches,
wherein the second branch comprises a first voltage controlled capacitor and biased by a first bias voltage and the third branch comprises a second voltage controlled capacitor and biased by a second bias voltage; and
a voltage splitter arrangement having a plurality of resistors to provide said first and second bias voltages; and
a control voltage terminal common to said three branches,
wherein the control voltage terminal is to shift a working point of a gate of said first voltage controlled capacitor relative to a working point of a gate of said second voltage controlled capacitor.
8. The tuning circuit of claim 7 wherein said second and third branches are provided with a common tuning voltage.
9. The tuning circuit of claim 7 wherein said voltage controlled capacitors are metal-oxide semiconductor field-effect-transistor voltage controlled capacitors.
10. The tuning circuit of claim 7 , wherein said bias voltages are selected to achieve a desired derivative-of-tuning-frequency to—said of a tuning voltage graph of said tuning circuit.
11. The tuning circuit of claim 10 , wherein said bias voltages are selected to achieve an equi-ripple derivative-of-tuning-frequency of said tuning voltage graph.
12. The tuning circuit of claim 7 , wherein said bias voltages are evenly shifted from each other.
13. The tuning circuit of claim 7 , wherein said bias voltages are evenly shifted from each other, and wherein said tuning circuit is in operable connection with an amplification unit.
14. The tuning circuit of claim 7 , wherein said voltage controlled capacitors are metal-oxide semiconductor field-effect-transistor voltage-controlled capacitors, and wherein said tuning circuit is in operable connection with an amplification unit.
15. The tuning circuit of claim 7 , wherein said voltage controlled capacitors are metal-oxide semiconductor field-effect-transistor voltage controlled capacitors, and wherein said tuning circuit is a tuner unit tuning circuit.
16. The tuning circuit of claim 7 , wherein said voltage controlled capacitors are provided with common tuning voltage.
17. A filter comprising:
at least one inductor device,
a voltage splitter arrangement having a plurality of resistors to provide first and second bias voltages, and
at least first and second branches each having at least one voltage controlled capacitor, and
a control voltage terminal common to said at least first and second branches,
wherein the control voltage terminal is to shift a working point of a gate of a first voltage controlled capacitor of the first branch relative to a working point of a gate of a second voltage controlled capacitor of a second branch,
wherein said first and second voltage controlled capacitors are biased by said first and second bias voltages, respectively.
18. The filter of claim 17 , wherein said at least two branches are provided with the same tuning voltage.
19. The filter of claim 17 , wherein said voltage controlled capacitors are metal-oxide semiconductor field-effect-transistor voltage controlled capacitors.