Radio frequency amplifier with constant gain setting

Details Radio frequency amplifier with constant gain setting Radio frequency amplifier with constant gain setting

2007-11-26

2009-10-06

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including plural stages cascaded

Reexamination Certificate

active

07598813

ABSTRACT:
Radio frequency amplifier with constant gain setting. A circuitry that includes triple well connected MOSFETs is employed to eliminate body effects therein. The voltage gain as presented herein, being implemented using a ratio of certain elements within the circuitry, is immune to variations in temperature, power supply voltage, and process variations. One implementation employs an array of selectable MOSFETs to allow for more than one gain setting to be provided by the amplifier. Such an amplifier has a variable/selectable gain setting. An appropriately placed MOSFET is employed to provide the desired input impedance (e.g., 50Ω). This design can be implemented using multiple n-channel metal oxide semiconductor field-effect transistors (N-MOSFETs) (some of which are triple well connected) and p-channel metal oxide semiconductor field-effect transistors (P-MOSFETs), or alternatively using P-MOSFETs and N-MOSFETs.

REFERENCES:
patent: 6822518 (2004-11-01), Lin et al.
patent: 2009/0085664 (2009-04-01), Yang et al.

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