Single ended input, differential output amplifier

• Main Authors: Hollenbeck, Neal W, Connell, Lawrence Edwin
• Format: Patent
• Language: English
• Published: 06.05.2003

1. Field of the Invention 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 Vis 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 Vthrough 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 ().