Power amplifier with power feedback
First Claim
1. A power amplifier system, comprising:
- a main signal path;
one or more power control ports;
a baseband current sensor;
a baseband voltage sensora power control block driven by an output power estimator block based on at least one of, a linear and a higher order summation of a sensed output voltage and current signals from the baseband current and voltage sensors, the baseband current and voltage sensors providing baseband sensing when the voltage and current are already in their envelope form and summation without multiplication, the voltage and current sensors directly driving the output power estimator block.
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Abstract
A power amplifier using a drain (collector) power control loop in which the feedback signal is an estimated output power level computed with a linear summation of the output sensed voltage and current. Both RF and baseband voltage and current sensing are possible, and voltage-mode or current-mode signal processing are feasible. This control loop technique is applicable to any means of drain power control circuits such as: supply regulators, DC-DC converters and others. Voltage error amplifiers can be used in conjunction with voltage feedback network, while current error amplifiers can be used with current feedback networks. Regulator sharing between different bands may be used as an area and cost reduction solution. The linear voltage and current summation driven power control technique can be also applied to the gate (base) power control scheme. Similarly, voltage-mode and current-mode signal processing can be implemented.
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Citations
16 Claims
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1. A power amplifier system, comprising:
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a main signal path; one or more power control ports; a baseband current sensor; a baseband voltage sensor a power control block driven by an output power estimator block based on at least one of, a linear and a higher order summation of a sensed output voltage and current signals from the baseband current and voltage sensors, the baseband current and voltage sensors providing baseband sensing when the voltage and current are already in their envelope form and summation without multiplication, the voltage and current sensors directly driving the output power estimator block. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification