| US 7,570,116 B2 | ||
| Output stage | ||
| Olli Haila, Piikkio (Finland); Song Qin, Shanghai (China); and Bin Shao, Shanghai (China) | ||
| Assigned to Analog Devices, Inc., Norwood, Mass. (US) | ||
| Filed on May 10, 2007, as Appl. No. 11/801,653. | ||
| Prior Publication US 2008/0278234 A1, Nov. 13, 2008 | ||
| Int. Cl. H03F 3/18 (2006.01) | ||
| U.S. Cl. 330—264 [330/255] | 23 Claims |
| 1. An output stage, comprising:
a first transistor operable to pull a voltage at an output node towards a first voltage;
a rechargeable energy store having a potential difference between first and second terminals wherein the rechargeable energy
store is arranged to be controllably connected between the output node and a second voltage supply such that the voltage at
the output node can be driven to a voltage outside of a range defined between the first and second voltages; and
a charging circuit for recharging the rechargeable energy store.
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