Radio frequency variable gain amplifier with linearity...

Amplifiers – With semiconductor amplifying device – Including plural stages cascaded

Reexamination Certificate

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C330S261000, C330S278000

Reexamination Certificate

active

06888411

ABSTRACT:
A multi-stage, variable gain amplifier whose linearity is relatively insensitive to variations in gain control is disclosed. The amplifier includes a primary cascoded pair of transistors for producing a primary output current from an input voltage as a function of a primary cascode control voltage. The amplifier further includes one or more secondary cascoded pairs of transistors coupled to the primary cascoded pair of transistors for producing one or more secondary output currents from the input voltage as a function of one or more secondary cascode control voltages. The output current of the RF circuit is a sum of the primary output current and the one or more secondary output currents

REFERENCES:
patent: 5903191 (1999-05-01), Gosser
patent: 5999056 (1999-12-01), Fong
patent: 6496067 (2002-12-01), Behzad et al.
patent: 6563382 (2003-05-01), Yang
Hull, Christopher Dennis,A Direct-Conversion Receiver for 900 MHz(ISM Band)Spread-Spectrum Digital Cordless Telephone, IEEE Journal of Solid-State Circuits, vol. 31, No. 12, Dec. 1996, 9 sheets.
Fong, Keng Leong,Dual-Band High-Linearity Variable-Gain Low-Noise Amplifiers for Wireless Applications, 1999 IEEE International Solid-State Circuits Conference, Digest of Technical Papers, 3 sheets.

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