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| Number | Title | Issue Date |
| 7053710 | Vacuum tube amplifier having grid as output and plate as input A vacuum tube amplifier is formed of a vacuum tube having a cathode, a plate, a grid, and a heater to radiate electrons from the cathode. An input signal is supplied to the plate, an output signal is obtained at the grid, and a predetermined low voltage is supplied ... | 05/30/2006 |
| 4276513 | Auto-zero amplifier circuit with wide dynamic range An operational amplifier (33) is continuously switched back-and-forth between an auto-zero mode of operation and an accurate amplification mode of operation. During the auto-zero mode of operation, the junction between an offset voltage compensation (e.g.... | 06/30/1981 |
