Radio-frequency mixer with stabilized biasing
AssigneeApple Inc.
InventorsMilad Darvishi, Haowei Jiang
Life of this patent
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Abstract
An electronic device may include wireless circuitry having a radio-frequency mixer. The mixer may include a first pair of mixer transistors configured to receive an oscillating signal, a second pair of mixer transistors configured to receive the oscillating signal, and a bias circuit configured to receive the oscillating signal and to generate a corresponding output voltage for controlling an amount of current flowing through the first and second pairs of mixer transistors. The bias circuit can be configured as a replica envelope detection circuit. The bias circuit can include a pair of bias transistors coupled to a tail transistor that receives the output voltage of the replica envelope detection circuit.
Claims20
Mixer circuitry comprising:
- a first mixer transistor configured to receive a first oscillating signal;
- a second mixer transistor configured to receive a second oscillating signal different than the first oscillating signal;
- a first bias transistor configured to receive the first oscillating signal and having source and drain terminals;
- and
- a second bias transistor configured to receive the second oscillating signal and having a drain terminal coupled to the drain terminal of the first bias transistor and a source terminal coupled to the source terminal of the first bias transistor.
Mixer circuitry comprising:
- a first pair of mixer transistors configured to receive an oscillating signal;
- a second pair of mixer transistors configured to receive the oscillating signal;
- and
- a bias circuit configured to receive the oscillating signal and to generate a corresponding output voltage for controlling an amount of current flowing through the first and second pairs of mixer transistors.
Mixer circuitry comprising:
- first and second mixer transistors configured to receive a differential oscillating signal;
- third and fourth mixer transistors configured to receive the differential oscillating signal;
- and
- an envelope detection circuit configured to
- receive the differential oscillating signal, and
- generate an output voltage for controlling an amount of current flowing through at least the first and second mixer transistors.
Dependencies are inferred from the claim text.