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Signal modulation circuit

A signal modulation and signal technology, applied in the field of transmitters, can solve problems such as complex circuit structure

Inactive Publication Date: 2010-12-08
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, in order to realize frequency modulation communication, a circuit for performing quadrature modulation is formed, but there is a disadvantage that the circuit structure is complicated

Method used

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Examples

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Effect test

no. 1 example

[0087] figure 1 is a block diagram of the communication device in the first embodiment of the present invention. figure 1 The transmitter shown includes an oscillator 101 , a control signal generator 102 , an intermittent frequency multiplier 103 , a filter 104 , a branch circuit 105 , a control component 106 and an output port 107 . The oscillator 101 and the intermittent frequency multiplier 103 are active circuits composed of active elements.

[0088] Hereafter, active elements will be discussed as FETs (Field Effect Transistors). The frequency multiplier of the intermittent frequency multiplier is n (n: a positive integer). In the following description, the desired frequency of the output signal of the oscillator is f0, and the intermittent frequency multiplier is a frequency multiplier by 2 (dual). The signal waveform of the control signal output from the control signal generator 102 is arbitrary, but will be discussed with a pulse waveform hereinafter.

[0089]A co...

no. 2 example

[0148] Figure 10 is a block diagram showing the structure of a pulse generator capable of generating a high on / off ratio pulse signal and capable of adjusting a power level in the second embodiment of the present invention. The second embodiment differs from the first embodiment in that a switch 1001 is provided instead of a branch circuit 105 , and a control section 106 includes a detector 1002 and a control section 1003 .

[0149] Figure 10 The structure shown is a transmitter-receiver. The transmitter includes an oscillator 101 , a control signal generator 102 , an intermittent frequency multiplier 103 and a filter 104 . The receiver comprises a detector 1002 and a control part 1003 . The transmitter and receiver are connected by a switch 1001 . Control section 1003 controls oscillator 101 and intermittent frequency multiplier 103 based on the waveform detected by detector 1002 included in the receiver. The control method is as described in the first embodiment.

[...

no. 3 example

[0156] Figure 11 is a block diagram showing the structure of a pulse generator capable of generating a high on / off ratio pulse signal and capable of adjusting a power level in the third embodiment of the present invention. The difference between the third embodiment and the first embodiment is that a switch 1001 is provided to replace the branch circuit 105, the control part 106 includes a mixer 1101 and a control part 1102, and an intermittent frequency multiplier 103 is provided between the oscillator 101 and the mixer 1101 is used to operate the mixer. As the intermittent frequency multiplier 103, a known circuit is used.

[0157] Figure 11 The structure shown is the same transmitter-receiver as the second embodiment. The transmitter includes an oscillator 101 , a control signal generator 102 , an intermittent frequency multiplier 103 and a filter 104 . The receiver includes a mixer 1101 and a control part 1102 . The transmitter and receiver are connected by a switch...

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Abstract

Provided is a signal modulation circuit which can control a transmission power even when performing a level adjustment of continuous signals from an oscillation circuit. A pulse generation circuit as an example of the signal modulation circuit includes: an oscillation circuit; a control signal generation circuit; a multiplication circuit; a filter; and a control unit. The oscillation circuit and the multiplication circuit are active circuits formed by active elements. The oscillation circuit outputs continuous signals, which are inputted to the multiplication circuit. The multiplication circuit is intermittently operated by the control signal outputted from the control signal generation circuit, thereby generating a pulse signal. The power level is easily adjusted by the signal from the control unit.

Description

technical field [0001] The present invention relates to a pulse generator, a signal modulator and a transmitter in wireless communication such as a frequency modulation circuit, in particular to a signal modulator and a transmitter with the function of adjusting output power. Background technique [0002] Pulse communication technology exists as a system of communication technology. In pulse communication technology, system performance depends on how the pulse signal is generated. In order to make the pulse signal a signal having only any desired frequency band components, there are methods of limiting the frequency band of the pulse signal with a filter and extracting a specific frequency component, a method of intermittently operating the oscillator with a pulse-shaped control signal, and inputting a pulse-shaped signal to A method of mixing and chopping (curtain) a carrier signal to produce a pulsed signal. [0003] For pulse generators, required properties include shor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K7/02H03C1/00H04L27/04
CPCH03C1/36H03C5/00H03K7/06H04L27/12
Inventor 小林茂松尾道明佐藤润二
Owner PANASONIC CORP
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