Amplifiers – Modulator-demodulator-type amplifier
Patent
1997-03-03
1998-12-08
Mottola, Steven
Amplifiers
Modulator-demodulator-type amplifier
330207A, 330297, H03F 338
Patent
active
058476024
ABSTRACT:
A delta-modulated magnitude amplifier is used to amplify the magnitude component of an RF power amplifier that employs envelope elimination and restoration. The delta-modulated amplifier introduces a smaller amount of non-linearity than traditional approaches, which are based upon pulse-width modulation. The disclosed technique can be implemented using switched-capacitor circuits in a standard MOS technology with only two external components, i.e., an inductor and a capacitor. Thus, the disclosed technique allows the implementation of an efficient and yet linear RF power amplifier using low-cost MOS technology.
REFERENCES:
patent: 4831334 (1989-05-01), Hudspeth et al.
patent: 5365187 (1994-11-01), Hornak et al.
Kahn, Leonard, R., "Single-Sideband Transmission by Envelope Elimination and Restoration", Proceedings of the I.R.E., Jul. 1952, pp. 803-806.
Koch M. J. and Fisher R. E., "A High Efficiency 835 MHz Linear Power Amplifier for Digital Cellular Telephony", Proceedings of the 39th IEEE Vehicular Technology Conference, May 1989, pp. 17-18.
Sokal, Nathan O, and Sokal, Alan D. "Class E-A New Class of High-Efficiency Tuned Single-Ended Switching Power Amplifiers", IEEE Journal of Solid-State Circuits, vol. SC-10, No. 3, Jun. 1975, pp. 168-176.
Hewlett--Packard Company
Mottola Steven
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