Electronic Devices Having Complementary Current Mirror Circuitry
AssigneeApple Inc.
InventorsMilad Darvishi, Georgios Palaskas
Life of this patent
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Abstract
An electronic device may include wireless circuitry having digital-to-analog converters, filters, mixers, and current buffers disposed between the filters and the mixers. The current buffers may provide proper resistance termination for the filters. The current buffers may include current mirrors formed from diode-connected n-type transistors and diode-connected p-type transistors, which collectively provide a linear input resistance. The current mirrors may receive a high voltage from a voltage regulator having a replica current mirror and proportional-to-absolute-temperature current sources.
Claims20
Wireless circuitry comprising:
- mixer circuitry;
- and
- a current buffer coupled to the mixer circuitry and including
- a first n-type transistor having a gate terminal and having a source-drain terminal coupled to its gate terminal, and
- a first p-type transistor having a gate terminal shorted to the gate terminal of the first n-type transistor and having a source-drain terminal coupled to its gate terminal.
Wireless circuitry comprising:
- mixer circuitry;
- and
- a current buffer coupled to the mixer circuitry and including
- a first inverter,
- a second inverter coupled to an input of the first inverter, and
- a first resistor coupled to the input of the first inverter.
Wireless circuitry comprising:
- a first filter having a first adjustable output capacitor with a first capacitance value;
- and
- a second filter having a second adjustable output capacitor with a second capacitance value, wherein the first and second capacitance values are tuned to optimize for an image rejection ratio of the wireless circuitry.
Dependencies are inferred from the claim text.