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 and coupled to a first tail node;
- a second mixer transistor configured to receive a second oscillating signal different than the first oscillating signal and coupled to the first tail node;
- and
- a first bias transistor configured to receive the first oscillating signal and coupled to a second tail node different than the first tail node.
Mixer circuitry comprising:
- a first pair of mixer transistors configured to receive an oscillating signal;
- and
- a bias circuit configured to receive the oscillating signal and to control an amount of current flowing through the first pair of mixer transistors.
Mixer circuitry comprising:
- a first pair of mixer transistors configured to receive an oscillating signal and coupled to a first tail node;
- a transformer coupled to the first tail node;
- and
- a bias circuit configured to receive the oscillating signal and being coupled to the transformer.
Dependencies are inferred from the claim text.