Method of comparing the amplitudes of two electric signals
First Claim
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1. A device for comparing amplitudes of a first and a second input signal, comprising:
- a product module arranged to generate data representative of powers conveyed by the two signals and compare the data in a single process, wherein the product module generates an output signal whose value is representative of a difference between mean values of squares of amplitudes of said the two input signals, and wherein the product module comprises;
a first and a second transistor forming a first differential pair, a third and a fourth transistor forming a second differential pair, a fifth and a sixth transistor forming a third differential pair, each transistor being provided with a control terminal, a transfer terminal and a reference terminal,the transfer terminal of the first transistor being connected to the reference terminals of the third and fourth transistors, the transfer terminal of the second transistor being connected to the reference terminals of the fifth and sixth transistors, the control terminals of the first and third transistors being intended to receive the first input signal, the control terminals of the second and sixth transistors being intended to receive the second input signal, the control terminals of the fourth and fifth transistors being intended to receive a same reference signal, the transfer terminals of the third and fifth transistors being connected to a supply terminal via a first resistor, the transfer terminals of the fourth and sixth transistors being connected to said supply terminal via a second resistor, the product module comprising, moreover, a low-pass filter, intended to receive an input signal drawn from the transfer terminals of the third and sixth transistors, and to supply the output signal of the product module.
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Abstract
An apparatus and method for comparing the amplitudes of two electric signals Iout and Qout are disclosed. The method includes a step wherein powers conveyed by the signals Iout and Qout are compared. One feature of the method and apparatus is that it is not necessary to storing the maxima of the signals to be compared when these signals are out of phase with respect to each other. One application of the method or apparatus is for the correction of differences in amplitude between I, Q signals that are separated in phase by 90° inside QAM, QPSK or QBSK demodulators.
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Citations
2 Claims
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1. A device for comparing amplitudes of a first and a second input signal, comprising:
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a product module arranged to generate data representative of powers conveyed by the two signals and compare the data in a single process, wherein the product module generates an output signal whose value is representative of a difference between mean values of squares of amplitudes of said the two input signals, and wherein the product module comprises;
a first and a second transistor forming a first differential pair, a third and a fourth transistor forming a second differential pair, a fifth and a sixth transistor forming a third differential pair, each transistor being provided with a control terminal, a transfer terminal and a reference terminal, the transfer terminal of the first transistor being connected to the reference terminals of the third and fourth transistors, the transfer terminal of the second transistor being connected to the reference terminals of the fifth and sixth transistors, the control terminals of the first and third transistors being intended to receive the first input signal, the control terminals of the second and sixth transistors being intended to receive the second input signal, the control terminals of the fourth and fifth transistors being intended to receive a same reference signal, the transfer terminals of the third and fifth transistors being connected to a supply terminal via a first resistor, the transfer terminals of the fourth and sixth transistors being connected to said supply terminal via a second resistor, the product module comprising, moreover, a low-pass filter, intended to receive an input signal drawn from the transfer terminals of the third and sixth transistors, and to supply the output signal of the product module. - View Dependent Claims (2)
a seventh and an eighth transistor forming a fourth differential pair, a ninth and a tenth transistor forming a fifth differential pair, wherein each of said transistors being provided with a control terminal, a transfer terminal and a reference terminal, the control terminal of the seventh transistor being intended to receive the first input signal, the control terminal of the tenth transistor being intended to receive the second input signal, the control terminals of the eighth and ninth transistors being intended to receive a same reference signal, the transfer terminals of the eighth and tenth transistors being connected, respectively, to the supply terminal via the first and second resistors.
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Specification
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Current AssigneeNXP B.V. (NXP Semiconductors NV)
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Original AssigneeKoninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
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InventorsCrinon, Guillaume, Chabanne, Sylvain, Constantinidis, Nicolas
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Primary Examiner(s)Vuong, Quochien B.
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Application NumberUS09/671,128Time in Patent Office1,448 DaysField of Search455/232.1, 455/234.1, 455/234.2, 455/249.1, 455/245.1, 455/245.2, 455/247.1, 455/250.1, 455/324, 455/226.1, 375/329, 375/345, 329/304, 330/278, 330/291US Class Current455/232.1CPC Class CodesH03D 3/009 Compensating quadrature pha...
