Phase invariant variable gain amplifier for a wireless system
AssigneeBdcm A2 LLC
InventorsAhmet Hakan COSKUN, Wei-Min KUO
Life of this patent
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Abstract
A variable gain amplifier is disclosed having parallel sets of transistors and control for bias voltages, wherein the average of bias voltage values is strategically controlled to reduce phase variance. For example, a variable gain amplifier may include a first set of transistors coupled to a first bias voltage, a second set of transistors coupled to a second bias voltage, where the second set of transistors is coupled in parallel with the first set of transistors, and a control module adapted to control the first and second bias voltages, the control module adapted to reduce the gain of the first set of transistors while increasing the gain of the second set of transistors.
Claims12
A variable gain amplifier, comprising:
- a first set of transistors coupled to a first bias voltage;
- a second set of transistors coupled to a second bias voltage, wherein the second set of transistors is coupled in parallel with the first set of transistors;
- and
- a control module adapted to control the first and second bias voltages, the control module adapted to reduce a gain of the first set of transistors while increasing a gain of the second set of transistors.
A method for phase control in a circuit having parallel sets of transistors, comprising:
- setting a first bias voltage for a first set of transistors;
- setting a second bias voltage for a second set of transistors;
- and
- controlling the first and second bias voltages so as to reduce a gain of the first set of transistors while increasing a gain of the second set of transistors.
A beamforming circuit, comprising:
- a phase shifter module, comprising:
- a first set of transistors coupled to a first bias voltage;
- a second set of transistors coupled to a second bias voltage, wherein the second set of transistors is coupled in parallel with the first set of transistors;
- and
- a control module adapted to control the first and second bias voltages, the control module adapted to reduce a gain of the first set of transistors while increasing a gain of the second set of transistors;
- and
- an antenna array coupled to the phase shifter module.
Dependencies are inferred from the claim text.