Variable gain amplifier including series-coupled cascode amplifiers
AssigneeIndustrial Technology Research Institute
InventorsMing-Ching Kuo, Shiau-Wen Kao, Chih-Hung Chen
Life of this patent
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Abstract
A variable gain amplifier to convert an amplifier input voltage to an amplifier output voltage, the variable gain amplifier includes: a plurality of cascode amplifiers coupled in series; a plurality of switching transistor pair circuits coupled in series; and a bias circuit coupled to provide bias voltages to each of the plurality of cascode amplifiers; wherein each of the switching transistor pair circuits is further coupled between two consecutive ones of the cascode amplifiers; a first one of the cascode amplifiers is configured to receive the amplifier input voltage; and a last one of the cascode amplifiers is configured to provide the amplifier output voltage.
Claims26
A variable gain amplifier to convert an amplifier input voltage to an amplifier output voltage, the variable gain amplifier comprising:
- a plurality of cascode amplifiers coupled in series;
- a plurality of switching transistor pair circuits coupled in series;
- and
- a bias circuit coupled to provide bias voltages to each of the plurality of cascode amplifiers;
- wherein each of the switching transistor pair circuits is further coupled between two consecutive ones of the cascode amplifiers;
- a first one of the cascode amplifiers is configured to receive the amplifier input voltage;
- and
- a last one of the cascode amplifiers is configured to provide the amplifier output voltage.
A variable gain amplifier to convert an amplifier input voltage to an amplifier output voltage, the variable gain amplifier comprising:
- first and second cascode amplifiers coupled in series;
- a switching transistor pair circuit coupled to the first and second cascode amplifiers;
- and
- a bias circuit coupled to provide bias voltages to each of the first and second cascode amplifiers;
- wherein the first cascode amplifier is configured to receive the amplifier input voltage, and the second cascode amplifier is configured to provide the amplifier output voltage, and
- wherein the switching transistor pair circuit comprises:
- first and second in input terminals;
- first and second output terminals;
- and
- first and second transistors having first and second gate terminals, respectively, the first and second gate terminals being coupled together to receive a switching voltage.
Dependencies are inferred from the claim text.