| US 7,498,876 B2 | ||
| Amplifier having half-wave tracking power rails | ||
| Robert O. Peruzzi, Bethlehem, Pa. (US); and David A. Rich, Monroe Township, N.J. (US) | ||
| Assigned to Agere Systems Inc., Allentown, Pa. (US) | ||
| Filed on Jun. 15, 2006, as Appl. No. 11/453,398. | ||
| Claims priority of provisional application 60/692094, filed on Jun. 20, 2005. | ||
| Prior Publication US 2006/0284673 A1, Dec. 21, 2006 | ||
| Int. Cl. H03F 3/38 (2006.01); H03G 3/20 (2006.01) | ||
| U.S. Cl. 330—10 [330/136] | 20 Claims |
| 1. A device, comprising:
a first amplifier adapted to generate an analog output signal in response to a digital input signal; and
a power supply adapted to power the first amplifier using a first power rail, wherein:
the first power rail substantially represents a biased and half-wave rectified version of said output signal; and
the power supply comprises a first power-supply path adapted to generate the first power rail based on the digital input signal,
said first power-supply path comprising:
a pulse-width modulator (PWM) adapted to process a digital signal corresponding to the input signal to generate a sequence
of pulses;
a switching circuit coupled to the PWM and adapted to amplify said sequence of pulses; and
a filter circuit coupled to the switching circuit and adapted to process the amplified sequence of pulses to generate the
first power rail.
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