17877503. Local Oscillator Driver Circuitry with Second Harmonic Rejection simplified abstract (Apple Inc.)
Local Oscillator Driver Circuitry with Second Harmonic Rejection
Organization Name
Inventor(s)
Omar E Elaasar of San Diego CA (US)
Aly Ismail of San Diego CA (US)
Local Oscillator Driver Circuitry with Second Harmonic Rejection - A simplified explanation of the abstract
This abstract first appeared for US patent application 17877503 titled 'Local Oscillator Driver Circuitry with Second Harmonic Rejection
Simplified Explanation
An electronic device is described in this patent application, which includes wireless circuitry with a mixer that receives an oscillating signal from oscillator circuitry. The oscillator circuitry consists of a chain of buffer circuits, also known as oscillator driver circuitry. Transformers are coupled at the input and output of each buffer circuit in the chain. Adjustable biasing circuits, in the form of digital-to-analog converters (DACs), are formed at the input of a selected buffer circuit in the chain. These adjustable biasing circuits apply a differential direct current (DC) offset voltage to the input of the selected buffer circuit. The value of the differential DC offset voltage is chosen to minimize the second harmonic component of the oscillator driver circuitry. By reducing the second harmonic conversion gain of the mixer, the transmit and receive performance of the wireless circuitry can be improved.
- The electronic device includes wireless circuitry with a mixer that receives an oscillating signal from oscillator circuitry.
- The oscillator circuitry is made up of a chain of buffer circuits, also known as oscillator driver circuitry.
- Transformers are coupled at the input and output of each buffer circuit in the chain.
- Adjustable biasing circuits, in the form of digital-to-analog converters (DACs), are formed at the input of a selected buffer circuit in the chain.
- The adjustable biasing circuits apply a differential direct current (DC) offset voltage to the input of the selected buffer circuit.
- The value of the differential DC offset voltage is chosen to minimize the second harmonic component of the oscillator driver circuitry.
- By reducing the second harmonic conversion gain of the mixer, the transmit and receive performance of the wireless circuitry can be improved.
Potential Applications
- Wireless communication devices
- Radio frequency (RF) transceivers
- Mobile phones
- Wi-Fi routers
- Bluetooth devices
Problems Solved
- Reduction of second harmonic conversion gain in mixers
- Improvement of transmit and receive performance in wireless circuitry
Benefits
- Enhanced performance of wireless communication devices
- Improved signal quality in RF transceivers
- Better connectivity and range in mobile phones, Wi-Fi routers, and Bluetooth devices
Original Abstract Submitted
An electronic device may include wireless circuitry having a mixer configured to receive an oscillating signal from oscillator circuitry. The oscillator circuitry can include a chain of buffer circuits sometimes referred to as oscillator driver circuitry. Transformers may be coupled at the input and output of each buffer circuit in the chain. Adjustable biasing circuits may be formed at the input of a selected buffer circuit in the chain of the buffer circuits. The adjustable biasing circuits can be digital-to-analog converters (DACs). The adjustable biasing circuits may be configured to apply a differential direct current (DC) offset voltage to the input of the selected buffer circuit. The differential DC offset voltage can have a value chosen to minimize a second harmonic component of the oscillator driver circuitry. Configured and operated in this way, a second harmonic conversion gain of the mixer can be reduced and can improve the transmit and receive performance of the wireless circuitry.
