Differential amplifiers
AssigneeNordic Semiconductor ASA
InventorPhil CORBISHLEY
Life of this patent
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Abstract
A differential amplifier comprises: a long tailed pair transistor configuration comprising a differential pair of transistors and a tail transistor; and a replica circuit configured to vary a feedback current in the replica circuit to match a replica voltage to a reference voltage, wherein varying the feedback current in the replica circuit 4 provides a bias voltage to the tail transistor in the long tailed pair which controls a tail current through the tail transistor to determine a common mode voltage in the long tailed pair.
Claims18
A differential amplifier comprising:
- a long tailed pair transistor configuration comprising a differential pair of transistors and a tail transistor;
- and
- a replica circuit configured to vary a feedback current in the replica circuit to match a replica voltage to a reference voltage, wherein varying the feedback current in the replica circuit provides a bias voltage to the tail transistor in the long tailed pair which controls a tail current through the tail transistor to determine a common mode voltage in the long tailed pair.
The differential amplifier as claimed in 1 claim wherein the replica circuit includes a feedback loop comprising half a differential pair.
A battery powered integrated circuit comprising a differential amplifier, said differential amplifier comprising:
- a long tailed pair transistor configuration comprising a differential pair of transistors and a tail transistor;
- and
- a replica circuit configured to vary a feedback current in the replica circuit to match a replica voltage to a reference voltage, wherein varying the feedback current in the replica circuit provides a bias voltage to the tail transistor in the long tailed pair which controls a tail current through the tail transistor to determine a common mode voltage in the long tailed pair.
Dependencies are inferred from the claim text.