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US 7,088,179 B2Granted
Single-ended input, differential output low noise amplifier
AssigneeAnalog Devices, Inc.
InventorsBarrie Gilbert, Todd C. Weigandt
Life of this patent
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Abstract
An amplifier has an input terminal to receive an input signal. The amplifier includes a first gain stage comprising a pair of input transistors and a second gain stage to drive an output stage. The output stage provides inverting and non-inverting differential output signals on inverting and non-inverting output nodes. The amplifier may also include a feedback signal electrically connected between the inverting and non-inverting output nodes to emitters of the input transistors through a resistor network.
Claims12
An amplifier comprising:
- an input terminal to receive an input signal;
- a first gain stage comprising a pair of input transistors;
- a second gain stage to drive a pair of output stages;
- a first resistor coupled between emitters of the pair of input transistors;
- the pair of output stages to provide inverting and non-inverting differential output signals on inverting and non-inverting output nodes;
- and
- a pair of feedback resistors electrically connected between the inverting and non-inverting output nodes and the emitters of the input transistors, wherein the feedback resistors are sized so that signal current through the first resistor is provided primarily by the output stages.
4 more elements
An amplifier, comprising:
- an input terminal to receive an input signal;
- a first gain stage comprising a pair of input transistors;
- a first resistor coupled between emitters of the pair of input transistors;
- a pair of output stages coupled to the pair of input transistors to provide inverting and non-inverting differential output signals on inverting and non-inverting output nodes;
- and
- a pair of feedback resistors electrically connected between the inverting and non-inverting output nodes and the emitters of the input transistors, wherein the feedback resistors are sized so that signal current through the first resistor is provided primarily by the output stages.
3 more elements
Dependencies are inferred from the claim text.