Amplitude detecting method, AGC circuit gain controlling method, amplitude detecting apparatus and AGC amplifier circuit
First Claim
1. An amplitude detecting method for gaining an amplitude detection signal by generating a number of alternating current signals between which there are phase differences on the basis of an alternating current signal of an object of amplitude detection and by carrying out same waveform processes on said number of alternating signals so as to average said number of alternating signals.
2 Assignments
0 Petitions
Accused Products
Abstract
In an amplitude detecting circuit, a phase shifter, into which an alternating current signal that is outputted from an AGC circuit is inputted, outputs first and second alternating current signals between which there is a phase difference. In addition, full wave rectifying is carried out in a first full wave rectifier on the first alternating current signal that is outputted from the phase shifter and in the same manner full wave rectifying is carried out in a second full wave rectifier on the second alternating current signal. Furthermore, in an averaging circuit, output signals of the first and second full wave rectifiers are averaged so as to generate an amplitude detection signal.
5 Citations
18 Claims
- 1. An amplitude detecting method for gaining an amplitude detection signal by generating a number of alternating current signals between which there are phase differences on the basis of an alternating current signal of an object of amplitude detection and by carrying out same waveform processes on said number of alternating signals so as to average said number of alternating signals.
- 5. An AGC circuit gain control method for supplying an amplitude detection signal to an ACG circuit as a gain control signal, by generating a number of alternating current signals between which there are phase differences on the basis of an alternating current signal that is outputted from said AGC circuit, by carrying out same waveform processes on said number of alternating current signals so as to average said number of alternating current signals and thereby gaining said amplitude detection signal.
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9. An amplitude detecting circuit, comprising:
- a phase shifter into which an alternating current signal of an object of amplitude detection is inputted and which outputs a number of alternating current signals between which there are phase differences;
a number of full wave rectifiers which respectively carry out full wave rectifying on said number of alternating current signals that are outputted from said phase shifter; and
an averaging circuit for generating an amplitude detection signal by averaging output signals of said number of full wave rectifiers. - View Dependent Claims (10)
- a phase shifter into which an alternating current signal of an object of amplitude detection is inputted and which outputs a number of alternating current signals between which there are phase differences;
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11. An amplitude detecting circuit, comprising:
- a phase shifter into which an alternating current signal of an object of amplitude detection is inputted and which outputs first and second alternating current signals between which there is a phase difference; and
a squaring and averaging circuit for generating an amplitude detection signal by squaring and averaging said first and second alternating current signals that are outputted from said phase shifter. - View Dependent Claims (12, 13)
- a phase shifter into which an alternating current signal of an object of amplitude detection is inputted and which outputs first and second alternating current signals between which there is a phase difference; and
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14. An AGC amplifier circuit, comprising:
- an AGC circuit into which an alternating current input signal is inputted and which amplifies the inputted signal by the gain that is in accordance with a gain control signal so as to output an alternating current signal; and
an amplitude detecting circuit for generating an amplitude detection signal which corresponds to the amplitude of the alternating current signal that is outputted from said AGC circuit so as to supply the amplitude detection signal to said AGC circuit as said gain control signal, whereinsaid amplitude detecting circuit comprises;
a phase shifter into which an alternating current signal that is outputted from said AGC circuit is inputted and which outputs a number of alternating current signals between which there are phase differences;
a number of full wave rectifiers which respectively carry out full wave rectifying on said number of alternating current signals that are outputted from said phase shifter; and
an averaging circuit for averaging output signals of said number of full wave rectifiers so as to generate said amplitude detection signal. - View Dependent Claims (15)
- an AGC circuit into which an alternating current input signal is inputted and which amplifies the inputted signal by the gain that is in accordance with a gain control signal so as to output an alternating current signal; and
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16. An AGC amplifier circuit, comprising:
- an AGC circuit into which an alternating current input signal is inputted and which amplifies the inputted signal by the gain in accordance with a gain control signal so as to output an alternating current signal; and
an amplitude detecting circuit for generating an amplitude detection signal which corresponds to the amplitude of the alternating current signal that is outputted from said AGC circuit so as to supply the amplitude detection signal to said AGC circuit as said gain control signal, whereinsaid amplitude detecting circuit comprises;
a phase shifter into which an alternating current signal that is outputted from said AGC circuit is inputted and which outputs first and second alternating current signals between which there is a phase difference; and
a squaring and averaging circuit for generating said amplitude detection signal by squaring and averaging said first and second alternating current signals that are outputted from said phase shifter. - View Dependent Claims (17, 18)
- an AGC circuit into which an alternating current input signal is inputted and which amplifies the inputted signal by the gain in accordance with a gain control signal so as to output an alternating current signal; and
Specification