Power control circuit, semiconductor device and transceiver circuit using the same
First Claim
1. A power control circuit that controls a gain of an amplifier in such a manner that output power of the amplifier reaches a desired power value according to a power control signal by using a directional coupler to take out a part of the output power of the amplifier at an output terminal of the amplifier and using a detector to detect a power value of the output power of the amplifier on a basis of an output value of the directional coupler, said power control circuit comprising:
- a digital feedback loop which converts an output signal of the detector as a detected signal to a digital signal, determines a first differential between the detected signal converted to the digital signal and the power control signal, and converts the first differential to a first analog signal and outputs a first feedback signal;
an analog feedback loop which outputs a high frequency element of a second differential between the power control signal converted to a second analog signal and the output signal of the detector as the detected signal as a second feedback signal; and
an adder which determines the sum of the first feedback signal and the second feedback signal and outputs a gain control signal for controlling the gain of the amplifier.
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Accused Products
Abstract
There is provided a power control circuit having a stable high-speed operation, and a semiconductor device and a transceiver circuit using it. The power control circuit controls the gain of an amplifier so that power outputted from the amplifier reaches a desired value according to a digital control signal. The power control circuit includes a digital feedback loop which converts a detected signal obtained by detecting a value of the output power of the amplifier to a digital signal, determines a differential between the digital signal and the digital control signal, converts the differential to an analog signal and outputs a first feedback signal, an analog feedback loop which outputs a high frequency element corresponding to a differential between an analog signal to which the digital control signal is converted and the detected signal, as a second feedback signal, and an adder which determines the sum of the first and the second feedback signal and outputs a gain control signal for controlling the gain of the amplifier.
53 Citations
20 Claims
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1. A power control circuit that controls a gain of an amplifier in such a manner that output power of the amplifier reaches a desired power value according to a power control signal by using a directional coupler to take out a part of the output power of the amplifier at an output terminal of the amplifier and using a detector to detect a power value of the output power of the amplifier on a basis of an output value of the directional coupler, said power control circuit comprising:
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a digital feedback loop which converts an output signal of the detector as a detected signal to a digital signal, determines a first differential between the detected signal converted to the digital signal and the power control signal, and converts the first differential to a first analog signal and outputs a first feedback signal; an analog feedback loop which outputs a high frequency element of a second differential between the power control signal converted to a second analog signal and the output signal of the detector as the detected signal as a second feedback signal; and an adder which determines the sum of the first feedback signal and the second feedback signal and outputs a gain control signal for controlling the gain of the amplifier. - View Dependent Claims (2, 3, 4)
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5. A semiconductor device comprising:
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a circuit block including, a receiver circuit which amplifies a received first signal; a first frequency conversion circuit which converts the frequency of the first signal of post-amplification outputted from said receiver circuit to output a second signal; a second frequency conversion circuit which inputs a third signal to be transmitted and converts the frequency of the third signal to output a fourth signal; a first amplifier which amplifies the fourth signal outputted from said second frequency conversion circuit and whose gain is controlled by a second power control signal; a second amplifier which amplifies the fourth signal outputted from said second frequency conversion circuit; a directional coupler which takes out a part of the output power of said second amplifier at the output terminal of said second amplifier; a detector which detects a power value of the output power of said second amplifier on a basis of an output value of said directional coupler; and a power control circuit which controls output power of said second amplifier by use of a first power control signal in such a manner that the output power reaches a desired power value by using said directional coupler and said detector, wherein said power control circuit comprises, a digital feedback loop which converts an output signal of said detector as a detected signal obtained by detecting a power value of the output power of the external second amplifier to a digital signal, determines a first differential between the detected signal converted to the digital signal and the first power control signal, and converts the first differential to a first analog signal and outputs a first feedback signal; an analog feedback loop which outputs a high frequency element of a second differential between the first power control signal converted to a second analog signal and the output signal of said detector as the detected signal as a second feedback signal; and an adder which determines the sum of the first feedback signal and the second feedback signal and outputs a gain control signal for controlling the output power, and wherein said circuit block is formed over the same semiconductor substrate. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A transceiver circuit comprising:
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a circuit block including, a first receiver circuit which amplifies a 1 ath signal of a first communication system, which is received by an antenna; a second receiver circuit which amplifies a 1 bth signal of a second communication system, which is received by the antenna; a first frequency conversion circuit which converts the frequency of the 1 ath or 1 bth signals of post-amplification outputted from said first or second receiver circuits to thereby output a second signal; a second frequency conversion circuit which inputs a 3 ath signal to be transmitted of the first communication system or a 3 bth signal to be transmitted of the second communication system and executes frequency conversion to the same to thereby output a fourth signal; a first amplifier which amplifies the fourth signal outputted from said second frequency conversion circuit and whose gain is controlled by a second power control signal; a second amplifier which amplifies the fourth signal of post-amplification outputted from said first amplifier; a directional coupler which takes out a part of the output power of said second amplifier at an output terminal of said second amplifier; a detector which detects a power value of an output signal of said second amplifier on a basis of an output value of said directional coupler to output a detected signal; and a power control circuit which controls an output power of said second amplifier by use of a first power control signal in such a manner that the output power reaches a desired power value by using said directional coupler and said detector, wherein said power control circuit comprises, a digital feedback loop which converts the detected signal outputted by the detector a digital signal, determines a first differential between the detected signal converted to the digital signal and the first power control signal, and converts the first differential to a first analog signal and outputs a first feedback signal; an analog feedback loop which outputs a high frequency element of a second differential between the first power control signal converted to a second analog signal and the detected signal as a second feedback signal; and an adder which determines the sum of the first feedback signal and the second feedback signal and outputs a gain control signal for controlling the output power. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification