Patent ID: 7944308

Claim:
An amplifier circuit comprising: a first unit having a first amplifying unit, said first amplifying unit having a first main circuit unit and a first assistant circuit unit, said first assistant circuit unit being configured to assist a linearity of said first main circuit unit, said first main circuit unit having a first transistor, said first assistant circuit unit having at least one second transistor; a second unit having a second amplifying unit, said second amplifying unit having a second main circuit unit and a second assistant circuit unit, said second main circuit unit being a third transistor, said second assistant circuit unit being at least one fourth transistor, said second assistant circuit unit being configured to assist a linearity of said second main circuit unit, the linearity of said first main circuit unit being adjusted by a width-to-length ratio of said at least one second transistor or being adjusted by a first bias voltage connected to said at least one second transistor, wherein said first amplifying unit is configured for conducting in one half cycle of an input signal, and wherein said second amplifying unit is configured for conducting in another half cycle of said input signal.