Envelope Tracking Power Supply with Direct Connection to Power Source
AssigneeBroadcom Corporation
InventorsDebopriyo Chowdhury, Ali Afsahi
Life of this patent
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Abstract
A communication device, such as a smart phone, includes an envelope tracking power supply. The envelope tracking power supply is configured for direct connection to a supply voltage. The direct connection may be made without connection through an intermediate voltage regulator, such as a low drop out regulator. The supply voltage may be a relatively high battery voltage, for example, that would normally result in greater than permissible voltage limits on the transistors used in conventional envelope tracking power supplies.
Claims20
A power supply modulator comprising:
- an envelope signal input;
- a power amplifier voltage supply output;
- an output stage configured for direct connection to an unregulated system power supply voltage;
- and
- control logic connected to the output stage and configured to generate, on the power amplifier voltage supply output, an envelope tracking voltage responsive to the envelope signal input.
A power supply modulator comprising:
- a reference signal input;
- a voltage supply output;
- a voltage supply input;
- an output stage configured for connection to the voltage supply input without intervening connection through a voltage regulator;
- and
- control logic connected to the output stage and configured to generate, on the voltage supply output, an output voltage that follows the reference signal input.
A transmitter comprising:
- a system power supply;
- a radio frequency envelope signal input;
- a power amplifier comprising:
- a power amplifier supply voltage input;
- and
- amplifier circuitry connected to the radio frequency signal input, the amplifier circuitry configured to amplify a radio frequency signal present on the radio frequency signal input;
- an envelope tracking power supply modulator comprising:
- an output stage connected to the system power supply without connecting through intervening voltage conditioning circuitry for the system power supply;
- and
- an error amplifier responsive to the radio frequency envelope signal input and power amplifier supply voltage input;
- and
- control logic connected to the error amplifier and the output stage and configured to generate, on the power amplifier voltage supply input, an envelope tracking power supply voltage responsive to the radio frequency envelope signal input.
Dependencies are inferred from the claim text.