Power amplifier in bicmos technology having an output stage in MOS technology
First Claim
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1. A power amplifier having an output stage in MOS technology, including:
- an upper half-output stage comprised of a first and a second P-channel MOS power transistors mounted as a current mirror;
a lower half-output stage comprised of a first and a second N-channel MOS power transistors mounted as a current mirror;
an output terminal corresponding to the common drains of the first P-channel MOS power transistor of the upper half-output stage and of the first N-channel MOS power transistor of the lower half-output stage; and
a control stage in bipolar technology for setting, according to a control voltage, two control currents of the upper half-output stage and the lower half-output stage, the control stage including;
a first PNP-type bipolar transistor setting a first current for controlling the upper half-stage;
a second NPN-type bipolar transistor setting a second current for controlling the lower half-stage; and
an input terminal for receiving the control voltage and connected to the respective bases of the first and second bipolar transistors.
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Abstract
The present invention relates to a power amplifier having an output stage in MOS technology, including an upper half-output stage comprised of two P-channel MOS power transistors mounted as a current mirror, a lower half-output stage comprised of two N-channel MOS power transistors mounted as a current mirror, an output terminal of the amplifier corresponding to the common drains of a first MOS transistor of the upper stage and of a first MOS transistor of the lower stage, and a control stage in bipolar technology for setting, according to a control voltage, two control currents of the half-output stages.
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Citations
18 Claims
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1. A power amplifier having an output stage in MOS technology, including:
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an upper half-output stage comprised of a first and a second P-channel MOS power transistors mounted as a current mirror; a lower half-output stage comprised of a first and a second N-channel MOS power transistors mounted as a current mirror; an output terminal corresponding to the common drains of the first P-channel MOS power transistor of the upper half-output stage and of the first N-channel MOS power transistor of the lower half-output stage; and a control stage in bipolar technology for setting, according to a control voltage, two control currents of the upper half-output stage and the lower half-output stage, the control stage including; a first PNP-type bipolar transistor setting a first current for controlling the upper half-stage; a second NPN-type bipolar transistor setting a second current for controlling the lower half-stage; and an input terminal for receiving the control voltage and connected to the respective bases of the first and second bipolar transistors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A power amplifier implemented in bipolar and MOS technology comprising:
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a first output stage having a first and second MOS transistor connected as a current mirror; a second output stage having a first and second MOS transistor connected as a current mirror; an output terminal coupled to the output stages; and a control stage having bipolar transistors, the control stage having an input terminal for receiving a control voltage and providing, based on the control voltage, a control current through each of the respective output stages, wherein the current through each of the respective output stages is equal when the control voltage is zero. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification