Differential buffer circuit
AssigneeSTMicroelectronics S.r.l.
InventorGaetano Cosentino
Life of this patent
Estimating the term…
Abstract
In an embodiment, a differential buffer includes: first and second input terminals configured to receive a differential input voltage; first and second output terminals configured to provide a differential output voltage; a differential source follower amplifier having first and second inputs respectively coupled to the first and second input terminals, and first and second outputs respectively coupled to the first and second output terminals; and a differential common source amplifier having first and second inputs respectively coupled to the second and first output terminals via a first pair of capacitors, and first and second outputs respectively coupled to the first and second output terminals.
Claims25
A differential buffer comprising:
- first and second input terminals configured to receive a differential input voltage;
- first and second output terminals configured to provide a differential output voltage;
- a differential source follower amplifier having first and second inputs respectively coupled to the first and second input terminals, and first and second outputs respectively coupled to the first and second output terminals;
- and
- a differential common source amplifier having first and second inputs respectively coupled to the second and first output terminals via a first pair of capacitors, and first and second outputs respectively coupled to the first and second output terminals.
A method comprising:
- receiving a differential input voltage with inputs of a differential source follower amplifier;
- receiving, at inputs of a differential common source amplifier, a differential output voltage from outputs of the source follower amplifier, wherein the outputs of the source follower amplifier are capacitively coupled to the inputs of the common source amplifier, and wherein outputs of the common source amplifier are coupled to the outputs of the source follower amplifier;
- and
- providing the output voltage to an input of a next circuit.
A device comprising:
- a first circuit configured to receive a radio-frequency signal and provide a differential input voltage;
- and
- a differential buffer comprising
- first and second input terminals configured to receive the differential input voltage,
- first and second output terminals configured to provide a differential output voltage,
- a differential source follower amplifier having first and second inputs respectively coupled to the first and second input terminals, and first and second outputs respectively coupled to the first and second output terminals, and
- a differential common source amplifier having first and second inputs respectively coupled to the second and first output terminals via a first pair of capacitors, and first and second outputs respectively coupled to the first and second output terminals.
Dependencies are inferred from the claim text.