Inventors:
Neal W. Hollenbeck - Palatine IL
Lawrence Edwin Connell - Naperville IL
Assignee:
Motorola, Inc. - Schaumburg IL
International Classification:
H03F 304
US Classification:
330301, 330253, 330327, 330318
Abstract:
A single ended input differential output amplifier ( ) and integrated circuit including such an amplifier ( ). A pair of load resistors ( ) are connected between a supply voltage (V ) and differential outputs OUTP and OUTM. An inductor ( ) is connected between input RFIN and a source bias voltage V. A first field effect transistor (FET) ( ) is connected, drain to source, between load resistor ( ) at output OUTP and inductor ( ) at RFIN. A second FET ( ) is connected, drain to source, between the second load resistor ( ) at output OUTM and the source bias voltage V. A gate bias voltage V is connected to the gate of FET ( ) and through resistor ( ) to the gate of FET ( ). A coupling capacitor ( ) is connected between the input RFIN and the gate of FET ( ). The gate of FET ( ) may be connected to gate bias voltage V through a second gate bias resistor ( ) and a second coupling capacitor ( ) may couple the source of FET ( ) to the gate of FET ( ), thereby providing common mode rejection for noise, e. g. , substrate noise, experienced at inductor ( ).