Class A/F amplifier having second and third order harmonic input

Details Class A/F amplifier having second and third order harmonic input Class A/F amplifier having second and third order harmonic input

1997-12-11

1999-10-19

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including signal feedback means

330306, H03F 134, H03F 304

Patent

active

059695757

ABSTRACT:
A new class A/F amplifier has an filtering and matching input circuit, a summing junction, an amplifying circuit, a filtering and feedback biasing circuit, and an output filtering and matching circuit. The filtering and matching input circuit responds to a radio frequency access input signal, for providing a filtered and matched radio frequency access input signal. The summing junction responds to the filtered and matched radio frequency access input signal, and further responds to a filtering and feedback biasing signal, for providing a summed, filtered, matched and feedback radio frequency access input signal. The amplifying circuit responds to the summed filtered, matched and feedback radio frequency access input signal, for providing an amplified, summed, filtered, matched and feedback radio frequency access input signal. The feedback and filtering biasing circuit responds to the amplified, summed, filtered, matched and feedback radio frequency access input signal, for providing the feedback and filtering biasing signal. The output filtering and matching circuit responds to the amplified, summed, filtered, matched and feedback radio frequency access input signal, for providing an amplified, summed, filtered, matched and feedback radio frequency access output signal. The class A/F amplifier substantially reduces harmonics in the radio frequency signal that cause power interference between adjacent channels, resulting in greatly improved mobile communication service having much fewer dropped calls and an enhanced calling range.

REFERENCES:
patent: 5347229 (1994-09-01), Suckling et al.
H.L. Krauss, Solid State Radio Engineering, John Wiley and Sons, New York 1980, (See pp. 352-355 and 454-448 attached).
"Linear RF Power Amplifier Design for CDMA Signals", by Qiang Wu, Martina Testa, and Robert Larkin, 1996 IEEE MTT-S Digest. p. 851. (To Be Submitted Shortly).
"Highly-Linear Highly-Efficient HBT for Communications Circuits." by R.S. Brozovich, D.R. Helms et al., 1994 GaAs IC p. 291. (To Be Submitted Shortly).

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