| US 7,514,997 B2 | ||
| Common mode regulation for thermal tail compensation | ||
| Jozef Adut, Nyack, N.Y. (US) | ||
| Assigned to LeCroy Corporation, Chestnut Ridge, N.Y. (US) | ||
| Filed on Sep. 11, 2006, as Appl. No. 11/518,765. | ||
| Prior Publication US 2008/0061877 A1, Mar. 13, 2008 | ||
| Int. Cl. H03F 3/45 (2006.01) | ||
| U.S. Cl. 330—256 [330/258; 330/297] | 17 Claims |
| 1. A waveform processing system comprising:
a channel to receive an input signal; and
a converter coupled to the channel to convert the input signal to a digital representation, wherein the converter comprises:
a differential circuit, comprising a differential amplifier, to condition the input signal, the differential circuit comprising
a pair of transistors biased by the input signal and a differential emitter follower circuit coupled to a differential signal
output of the differential circuit;
a controller to maintain a common mode voltage in the differential circuit by controlling a supply voltage that is supplied
to the differential circuit such that at least one of the transistors dissipates power at a substantially constant level;
and
a common mode voltage sensor to detect a common mode voltage that represents the common mode voltage that is maintained by
the controller.
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