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US 2026/0303040 A1Published application
Differential radio frequency amplifier
AssigneeSkyworks Solutions, Inc.
InventorsMehdi Naseri Ali Abadi, Hassan Sarbishaei, Mostafa Azizi
Life of this patent
Estimating the term…
Abstract
A fully differential power amplifier has an input matching network, a plurality of stacked transistors connected by a plurality of inter stack networks (ISNs), and an output matching network for amplification and conditioning of signal components. The differential amplifier uses a modified cascode FET topology with the FETs connected by gate decoupling capacitors to strongly attenuate common mode oscillations and eliminate the need for a source degeneration inductor or matching transformer. Inter stack networks provide signal conditioning and filtering between amplification stages to improve amplifier performance metrics such as long-term reliability, output power, and efficiency.
Claims20
A power amplifier system comprising:
- a first differential power amplifier including a first input and a second input receiving a first radio frequency differential input signal, a first output and a second output providing a first radio frequency differential output signal, a first gain transistor having a gate connected to the first input, a first cascode transistor electrically connected between a drain of the first gain transistor and the first output, a second gain transistor having a gate connected to the second input, a second cascode transistor electrically connected between a drain of the second gain transistor and the second output, a gate decoupling capacitor differentially connecting a gate of the first cascode transistor to a gate of the second cascode transistor to provide signal attenuation in common mode operation, a first bias resistor electrically connected between the gate of the first cascode transistor and a bias voltage, and a second bias resistor electrically connected between the gate of the second cascode transistor and the bias voltage;
- a second differential power amplifier receiving a second radio frequency differential input signal and outputting a second radio frequency differential output signal;
- and
- a digital signal processing circuit configured to control the first radio frequency differential input signal and the second radio frequency differential input signal to provide beamforming.
1 more element
A radio frequency module comprising:
- a module substrate;
- a power amplifier die attached to the substrate, the power amplifier die including a first differential power amplifier that includes a first input and a second input receiving a first radio frequency differential input signal, a first output and a second output providing a first radio frequency differential output signal, a first gain transistor having a gate connected to the first input, a first cascode transistor electrically connected between a drain of the first gain transistor and the first output, a second gain transistor having a gate connected to the second input, a second cascode transistor electrically connected between a drain of the second gain transistor and the second output, a gate decoupling capacitor differentially connecting a gate of the first cascode transistor to a gate of the second cascode transistor to provide signal attenuation in common mode operation, a first bias resistor electrically connected between the gate of the first cascode transistor and a bias voltage, and a second bias resistor electrically connected between the gate of the second cascode transistor and the bias voltage, the power amplifier die further including a second differential power amplifier receiving a second radio frequency differential input signal and outputting a second radio frequency differential output signal;
- and
- a digital signal processor attached to the substrate and configured to control the first radio frequency differential input signal and the second radio frequency differential input signal to provide beamforming.
1 more element
A mobile device comprising:
- an antenna array;
- and
- a front-end system electrically connected to the antenna array, the front-end system including a first differential power amplifier that includes a first input and a second input receiving a first radio frequency differential input signal, a first output and a second output providing a first radio frequency differential output signal, a first gain transistor having a gate connected to the first input, a first cascode transistor electrically connected between a drain of the first gain transistor and the first output, a second gain transistor having a gate connected to the second input, a second cascode transistor electrically connected between a drain of the second gain transistor and the second output, a gate decoupling capacitor differentially connecting a gate of the first cascode transistor to a gate of the second cascode transistor to provide signal attenuation in common mode operation, a first bias resistor electrically connected between the gate of the first cascode transistor and a bias voltage, and a second bias resistor electrically connected between the gate of the second cascode transistor and the bias voltage, the front-end system further including a second differential power amplifier receiving a second radio frequency differential input signal and outputting a second radio frequency differential output signal, and a digital signal processing circuit configured to control the first radio frequency differential input signal and the second radio frequency differential input signal to provide beamforming on the antenna array.
Dependencies are inferred from the claim text.