Mobile wireless communications device including sensing transistor and hysteretic comparator and related methods
First Claim
1. A mobile wireless communications device comprising:
- a portable housing;
a supply modulator carried by said portable housing and comprisingan output node,a linear amplifier coupled to said output node, anda switching amplifier also coupled to said output node and comprisingat least one sensing transistor configured to sense current output from said linear amplifier and generate a drive voltage, anda hysteretic comparator coupled to said at least one sensing transistor and configured to be driven by the drive voltage;
a radio frequency (RF) power amplifier coupled to said output node of said supply modulator; and
a wireless transceiver carried by said portable housing and coupled to said RF power amplifier.
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Accused Products
Abstract
A mobile wireless communications device may include a portable housing, and a supply modulator carried by the portable housing. The supply modulator may include an output node, a linear amplifier coupled to the output node, and a switching amplifier also coupled to the output node. The switching amplifier may include at least one sensing transistor configured to sense current output from the linear amplifier and generate a drive voltage, and a hysteretic comparator coupled to the at least one sensing transistor and configured to be driven by the drive voltage. The mobile wireless communications device may also include a radio frequency (RF) power amplifier coupled to the output node of the supply modulator, and a wireless transceiver carried by the portable housing and coupled to the RF power amplifier.
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Citations
18 Claims
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1. A mobile wireless communications device comprising:
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a portable housing; a supply modulator carried by said portable housing and comprising an output node, a linear amplifier coupled to said output node, and a switching amplifier also coupled to said output node and comprising at least one sensing transistor configured to sense current output from said linear amplifier and generate a drive voltage, and a hysteretic comparator coupled to said at least one sensing transistor and configured to be driven by the drive voltage; a radio frequency (RF) power amplifier coupled to said output node of said supply modulator; and a wireless transceiver carried by said portable housing and coupled to said RF power amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A supply modulator to be carried by a portable housing of a mobile wireless communications device comprising a radio frequency (RF) power amplifier and a wireless transceiver carried by the portable housing and coupled to the RF power amplifier, the supply modulator comprising:
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an output node coupled to be coupled to the RF power amplifier; a linear amplifier coupled to said output node; and a switching amplifier also coupled to said output node and comprising at least one sensing transistor configured to sense current output from said linear amplifier and generate a drive voltage, and a hysteretic comparator coupled to said at least one sensing transistor and configured to be driven by the drive voltage. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method of operating a supply modulator for a power amplifier of a mobile wireless communications device, the supply modulator comprising an output node, a linear amplifier coupled to the output node, and a switching amplifier coupled to the linear amplifier, method comprising:
using the switching amplifier to sense current output from the linear amplifier via at least one sensing transistor, generate a drive voltage via the at least one sensing transistor, and drive a hysteretic comparator coupled to the at least one sensing transistor with the drive voltage. - View Dependent Claims (15, 16, 17, 18)
Specification