Digital AM transmitter having tracking power supply compensation
First Claim
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1. An AM transmitter with tracking power supply compensation, comprising:
- a first power supply that provides a constant DC operating voltage;
a second power supply that provides a DC voltage, the second power supply including a controller that compares the input signal to a threshold voltage and determines an appropriate value for the provided voltage according to the comparison; and
a plurality of RF amplifiers that provide an amplified representation of the input signal, each of the plurality of amplifiers being connected to the first and second power supplies and having an output circuit that, when the associated amplifier is on, supplies energy from the first and second power supplies to provide an output voltage to a load.
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Abstract
An AM transmitter having tracking power supply compensation. A first power supply provides a constant DC operating voltage. A second power supply is responsive to an input signal, such that the second power supply provides a DC voltage when an amplitude associated with the input signal exceeds a predetermined level. N RF amplifiers amplify the input signal. Each of the plurality of amplifiers are connected to the first and second power supplies. Each of the amplifiers has an output circuit that, when the associated amplifier is on, supplies energy from the first and second power supplies to provide an output voltage to a load.
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Citations
16 Claims
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1. An AM transmitter with tracking power supply compensation, comprising:
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a first power supply that provides a constant DC operating voltage;
a second power supply that provides a DC voltage, the second power supply including a controller that compares the input signal to a threshold voltage and determines an appropriate value for the provided voltage according to the comparison; and
a plurality of RF amplifiers that provide an amplified representation of the input signal, each of the plurality of amplifiers being connected to the first and second power supplies and having an output circuit that, when the associated amplifier is on, supplies energy from the first and second power supplies to provide an output voltage to a load. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A transmitter with tracking power supply compensation, comprising:
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at least one amplifier that provides an amplified representation of an input signal;
a first power supply that provides a constant DC operating voltage to the amplifier;
a second power supply that outputs a variable DC voltage to the amplifier, the second power supply including a controller that compares the input signal to a threshold voltage and determines an appropriate value for the output voltage according to the comparison. - View Dependent Claims (9)
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10. An AM transmitter with tracking power supply compensation, comprising:
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a plurality of amplifiers, connected in parallel to a common load, that provide an amplified representation of an input signal to the load;
a first power supply that provides a constant voltage to each of the plurality of amplifiers;
a controller that selectively actuates a number of the RF amplifiers; and
a second power supply that provides an additional voltage to each of the plurality of amplifiers only when the input signal exceeds a threshold voltage. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification