Amplifiers – With amplifier bypass means
Patent
1998-10-19
2000-11-07
Lee, Benny
Amplifiers
With amplifier bypass means
330149, H03F 100
Patent
active
061442550
ABSTRACT:
A method and apparatus for reducing out-of-band frequency components of an RF amplified input signal, the amplified signal having both in-band frequency components and out-of-band frequency components, employ a feedforward network in which a microprocessor can sweep a frequency generator output connected to a mixer, the other input of the mixer being the amplified output, to find the carrier frequency of the input signal, and thereafter modify or control the feedforward circuit to reduce out-of-band frequency component energies in a particular manner. For example, gain and phase of a variable gain-phase network in a feedforward circuit structure can be modified for reducing the out-of-band frequency component energy.
REFERENCES:
patent: 5130663 (1992-07-01), Tattersall, Jr.
patent: 5485120 (1996-01-01), Anvari
patent: 5808512 (1998-09-01), Bainvoll et al.
patent: 5912586 (1999-06-01), Mitzlaff
patent: 5923214 (1999-07-01), Mitzlaff
Kim Kwang
Klein Stefan
Patel Sandip
Posner Richard D.
Roberts Wayne
Choe Henry
Lee Benny
Powerwave Technologies Inc.
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