Patent ID: 7265620
Filing Date: 2007-09-04
Classification: H03F

Abstract:
1. A wideband amplifier comprising: a first differential input and a second differential input that are driven in opposite directions to carry data; a transconductance stage that comprises: a first differential transistor having a gate that receives the first differential input, the gate controlling current in a channel between a first inter-stage node and a first tail node; a first load between a first supply and the first inter-stage node, the first load having a first resistor in parallel with a channel of a first load transistor; a second differential transistor having a gate that receives the second differential input, the gate controlling current in a channel between a second inter-stage node and the first tail node; a second load between the first supply and the second inter-stage node, the second load having a second resistor in parallel with a channel of a second load transistor; a second stage that comprises: a third differential transistor having a gate that receives the first inter-stage node, the gate controlling current in a channel between a first output node and a second tail node; a third load between the first supply and the first output node, the third load having a third resistor in parallel with a channel of a third load transistor; a fourth differential transistor having a gate that receives the second inter-stage node, the gate controlling current in a channel between a second output node and the second tail node; and a fourth load between the first supply and the second output node, the fourth load having a fourth resistor in parallel with a channel of a fourth load transistor; wherein the second stage further comprises: a first shunt resistor coupled between the first inter-stage node and the first output node; a second shunt resistor coupled between the second inter-stage node and the second output node, whereby the second stage is a shunt-shunt-feedback stage and whereby the first, second, third, and fourth loads each have a resistor and a transistor in parallel.