MOBILE COMMUNICATIONS DEVICE INCLUDING AN RF TRANSMITTER PROVIDING IMPEDANCE FLUCTUATION DAMPENING AND RELATED METHODS
First Claim
1. A mobile communications device comprising:
- a radio frequency (RF) signal source configured to generate RF signals over at least one RF frequency band;
an RF transmitter coupled to said RF signal source and comprisingan RF amplifier configured to operate over a plurality of different power control levels, said RF amplifier having an input configured to receive the RF signals from said signal source and an output having an impedance which changes based upon changes between the different power control levels, andat least one shunt resistor coupling the output of said amplifier to a voltage reference, said at least one shunt resistor configured to decrease a highest impedance change of the RF amplifier output to below a threshold impedance level; and
at least one antenna coupled to the output of said RF amplifier and configured to operate over the at least one RF frequency band.
6 Assignments
0 Petitions
Accused Products
Abstract
A mobile communications device may include an RE signal source configured to generate RF signals over an RE frequency band(s), and an RF transmitter coupled to the RE signal source. The RF transmitter may include an RF amplifier configured to operate over a plurality of different power control levels. The RF amplifier may have an input configured to receive the RF signals from the RF signal source and an output having an impedance which changes based upon changes between the different power control levels. The RF transmitter may further include a shunt resistor(s) coupling the output of the amplifier to a voltage reference, and the shunt resistor(s) may be configured to decrease a highest impedance change of the RE amplifier output to below a threshold impedance level. An antenna(s) may be coupled to the output of the RF amplifier to operate over the at least one RF frequency band.
27 Citations
23 Claims
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1. A mobile communications device comprising:
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a radio frequency (RF) signal source configured to generate RF signals over at least one RF frequency band; an RF transmitter coupled to said RF signal source and comprising an RF amplifier configured to operate over a plurality of different power control levels, said RF amplifier having an input configured to receive the RF signals from said signal source and an output having an impedance which changes based upon changes between the different power control levels, and at least one shunt resistor coupling the output of said amplifier to a voltage reference, said at least one shunt resistor configured to decrease a highest impedance change of the RF amplifier output to below a threshold impedance level; and at least one antenna coupled to the output of said RF amplifier and configured to operate over the at least one RF frequency band. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12)
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- 2. The mobile communications device of Claim I further comprising a pass-band filter having an input coupled to the output of said RF amplifier, and an output coupled to said at least one antenna.
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13. A mobile communications device comprising:
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a radio frequency (RF) signal source configured to generate RF signals over at least one RF frequency band; an RF transmitter coupled to said RF signal source and comprising an RF amplifier configured to operate over a plurality of different power control levels, said RF amplifier having an input configured to receive the RF signals from said RF signal source and an output having an impedance which changes based upon changes between the different power control levels, a pass-band filter having an input coupled to the output of said RF amplifier and an output, and at least one shunt resistor coupling the output of said amplifier to ground, said at least one shunt resistor configured to decrease a highest impedance change of the RF amplifier output to below a threshold impedance level; and at least one antenna coupled to the output of said RF amplifier and configured to operate over the at least one RF frequency band. - View Dependent Claims (14, 15, 16)
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17. A method for making a mobile communications device comprising:
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coupling an input of a radio frequency (RF) amplifier to an RF signal source, the RF signal source being configured to generate RF signals over at least one RF frequency band, and the RF amplifier being configured to operate over a plurality of different power control levels and having an output with an impedance which changes based upon changes between the different power control levels; determining a highest impedance change of the RF amplifier output based upon the changes between the different power control levels; and coupling at least one shunt resistor between the output of the amplifier and a voltage reference, the at least one shunt resistor being configured to decrease a highest impedance change of the RF amplifier output to below a threshold impedance level. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification