Low-noise high efficiency bias generation circuits and method
View Patent ↗Embodiments of signal bias generators and regulators are described generally herein. Other embodiments may be described and claimed.
1. An apparatus for generating a substantially steady state positive voltage signal (PVS) and a substantially steady state negative voltage signal (NVS) to a switching module (SM), the PVS and the NVS remaining substantially stable during a switching event of the SM, including:
a bias signal generation module (BSGM) for generating a substantially steady state reference voltage signal (RVS), the ratio of the PVS voltage magnitude to the RVS voltage magnitude being about 1.5 to 4;
a positive signal generation module (PSGM) generating the PVS, the PSGM including a first capacitor, the PSGM employing the first capacitor to nominally generate a portion of the PVS based on the RVS; and
a negative signal generation module (NSGM) generating the NVS, the NSGM including a second capacitor, the NSGM employing the second capacitor to nominally generate a portion of the NVS based on the RVS.
2. The apparatus of claim 1 , wherein the SM modulates a radio frequency (RF) signal.
3. The apparatus of claim 2 , wherein the BSGM generates an internal, substantially stable, voltage signal (IVS) based on at least partially on the first FET bias signal and the RVS.
4. The apparatus of claim 3 , wherein the PSGM generates the PVS in part with the IVS.
5. The apparatus of claim 4 , wherein the NSGM generates the NVS in part with the IVS.
6. The apparatus of claim 3 , wherein the PSGM employs the first capacitor to nominally generate about half of the voltage level of the PVS.
7. The apparatus of claim 6 , wherein the NSGM employs the second capacitor to nominally generate about half of the magnitude of the voltage level of the NVS.
8. The apparatus of claim 1 , the PSGM generating a positive capacitor control signal (PCCS) based at least partially on the RVS and employing the first capacitor to nominally generate a portion of the PVS at least partially based on the PCCS.
9. The apparatus of claim 1 , the NSGM generating a negative capacitor control signal (NCCS) based at least partially on the RVS and employing the second capacitor to nominally generate a portion of the NVS at least partially based on the NCCS.
10. The apparatus of claim 1 , the BSGM employing a first FET element and a second FET element formed on a common silicon on insulator (SOT) wafer in part to generate the RVS where the RVS is temperature independent.
11. The apparatus of claim 1 , wherein the ratio of the NVS voltage magnitude to the RVS voltage magnitude is about 1.5 to 4.
12. The apparatus of claim 1 , the BSGM further generating a first field effect transistor (FET) bias signal and a second FET bias signal, the PSGM at least employing the first FET bias signal, and the NSGM at least employing the second FET bias signal.
13. The apparatus of claim 12 , wherein the PSGM employs the first FET bias signal at least partially to generate a current drain.
14. The apparatus of claim 13 , wherein the NSGM employs the second FET bias signal at least partially to generate a current source.
15. The apparatus of claim 13 , wherein the PSGM includes a differential module, the differential module employing the current drain and determining a differential between the PVS signal voltage level and the RVS voltage level.
16. The apparatus of claim 14 , wherein the NSGM includes a differential module, the differential module employing the current source and determining a differential between the NVS signal voltage level and the RVS voltage level.
17. A method of generating a substantially steady state positive voltage signal (PVS) and a substantially steady state negative voltage signal (NVS) to a switching module (SM), the PVS and the NVS remaining substantially stable during a switching event of the SM, including:
generating a substantially steady state reference voltage signal (RVS), the ratio of the PVS voltage magnitude to the RVS voltage magnitude being about 1.5 to 4;
employing a first capacitor to nominally generate a portion of the PVS based on the RVS; and
employing a second capacitor to nominally generate a portion of the NVS based on the RVS.
18. The method of claim 17 , wherein the SM modulates a radio frequency (RF) signal.
19. The method of claim 18 , further including generating an internal, substantially stable, voltage signal (IVS) based on at least partially on the first FET bias signal and the RVS.
20. The method of claim 19 , further including generating the PVS in part with the IVS.
21. The method of claim 20 , further including generating the PVS in part with the IVS.
22. The method of claim 17 , further including generating a positive capacitor control signal (PCCS) based at least partially on the RVS and employing the first capacitor to nominally generate a portion of the PVS at least partially based on the PCCS.
23. The method of claim 22 , further including generating a negative capacitor control signal (NCCS) based at least partially on the RVS and employing the second capacitor to nominally generate a portion of the NVS at least partially based on the NCCS.
24. The method of claim 17 , further including employing a first FET element and a second FET element formed on a common silicon on insulator (SOI) wafer in part to generate the RVS where the RVS is temperature independent.
25. The method of claim 17 , wherein the ratio of the NVS voltage magnitude to the RVS voltage magnitude is about 1.5 to 4.
26. The method of claim 17 , further including generating a first field effect transistor (FET) bias signal and a second FET bias signal.
27. The method of claim 26 , further including employing the first FET bias signal at least partially to generate a current drain.
28. The method of claim 27 , further including employing the second FET bias signal at least partially to generate a current source.
29. The method of claim 27 , further including employing the current drain in part to determine a differential between the PVS signal voltage level and the RVS voltage level.
30. The method of claim 28 , further including employing the current source in part to determine a differential between the NVS signal voltage level and the RVS voltage level.
31. The method of claim 17 , further including employing the first capacitor to nominally generate about half of the voltage level of the PVS.
32. The method of claim 31 , further including employing the second capacitor to nominally generate about half of the magnitude of the voltage level of the NVS.