Power amplifier input structure having a differential output

Details Power amplifier input structure having a differential output Power amplifier input structure having a differential output

2006-09-26

2006-09-26

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including balanced to unbalanced circuits and vice versa

C330S135000, C330S165000, C330S188000

Reexamination Certificate

active

07113045

ABSTRACT:
A method and apparatus provides an input structure for a power amplifier. In one example, the input structure has an input network and a predriver circuit to provide an input signal to the power amplifier. The input network includes a transformer for helping to maintain a constant input impedance. The predriver includes a limiting amplifier that provides isolation between the power amplifier and the RF input. A DC feedback circuit is used by the predriver that maintains the DC level of the inverters to a desired level.

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T. Cho, E. Dukratz, M. Mack, D. Macnally, M. Marringa, S. Mehta, C. Nilson, L. Plouvier, and S. Rabii, “A single-chip CMOS direct-conversion transceiver for 900MHz spread-spectrum digital cordless phones,” IEEE International Solid-State Circuits Conference, vol. XLII, pp. 228-229, Feb. 1999.

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