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US 9,362,872 B2Granted
Self-biasing radio frequency circuitry
AssigneeMarvell World Trade Ltd.
InventorsJinho Park, Yuan Lu, Li Lin
Life of this patent
Estimating the term…
Abstract
The present disclosure describes self-biasing radio frequency circuitry. In some aspects a radio frequency (RF) signal is amplified via a circuit having a first transistor configured to source current to an output of the circuit and a second transistor configured to sink current from the output of the circuit, and another signal is provided, without active circuitry, from the output of the circuit to a gate of the first transistor effective to bias a voltage at the output of the circuit. By so doing, the output of the circuit can be biased without active circuitry which can reduce design complexity of and substrate area consumed by the circuit.
Claims20
A circuit comprising:
- a first transistor connected between a power rail and an output of the circuit, the first transistor configured to source, based on a radio frequency signal received at an input of the circuit, current from the power rail to the output of the circuit;
- a second transistor connected between the output of the circuit and a node having a potential lower than that of the power rail, the second transistor configured to sink, based on the radio frequency signal received at the input of the circuit, current from the output of the circuit to the node having the lower potential;
- non-active biasing circuitry operably connected between the output of the circuit and a gate of the first transistor or a gate of the second transistor, the non-active biasing circuitry comprising a first resistor and being effective to bias a voltage of the output of the circuit;
- and
- non-active compensating circuitry operably connected in parallel with the non-active biasing circuitry, the non-active compensating circuitry comprising a capacitor and second resistor connected in series and being effective to compensate the output of the circuit.
2 more elements
A method comprising:
- amplifying a radio frequency signal via a circuit having a first transistor and a second transistor, the first transistor connected between a power rail and an output of the circuit, the first transistor configured to source current from the power rail to the output of the circuit based on the radio frequency signal, the second transistor connected between the output of the circuit and a node having a potential lower than that of the power rail, the second transistor configured to sink current from the output of the circuit to the node having the lower potential based on the radio frequency signal;
- providing, via a first resistor connected between the output of the circuit and the gate of the first transistor or the gate of the second transistor, a bias signal from the output of the circuit to the gate of the first transistor or the gate of the second transistor effective to bias a voltage at the output of the circuit;
- compensating the bias signal via a capacitor connected in parallel with the first resistor;
- and
- preventing, via a second resistor connected in series with the capacitor, the capacitor from conducting radio frequency energy from the output of the circuit to the gate of the first transistor or the gate of the second transistor.
2 more elements
An amplifier comprising:
- an input configured to receive a radio frequency signal;
- an output configured to transmit an amplified radio frequency signal;
- a first transistor configured to provide the amplified radio frequency signal by sourcing, based on the radio frequency signal, current from a power rail to the output of the amplifier;
- a second transistor configured to provide the amplified radio frequency signal by sinking, based on the radio frequency signal, current from the output of the amplifier to a node having a lower potential than that of the power rail;
- a first resistor connected between the output of the amplifier and a gate of the first transistor or a gate of the second transistor to provide a bias signal from the output of the amplifier to the gate of the first transistor or the gate of the second transistor effective to bias a voltage of the amplified radio frequency signal;
- and
- a capacitor and a second resistor connected in parallel with the first resistor to compensate the amplified radio frequency signal, the capacitor and second resistor connected in series.
4 more elements
Dependencies are inferred from the claim text.