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Transmitter and wireless communication apparatus

A transmitter and linear mode technology, applied in the direction of electrical components, high-frequency amplifiers, transmission systems, etc., can solve the problem of not being able to fully guarantee the transmission output level range, and achieve high efficiency

Inactive Publication Date: 2010-01-27
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, in a communication device requiring a wide output control variable width as in recent mobile phone standards (for example, about 43dB+α in EGPRS of the European mobile phone standard), the necessary transmission cannot be sufficiently secured. output level range

Method used

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  • Transmitter and wireless communication apparatus
  • Transmitter and wireless communication apparatus
  • Transmitter and wireless communication apparatus

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0094] figure 1 is a block diagram showing the configuration of the transmitter according to the first embodiment of the present invention. The transmission section 10 of the transmitter implementing the first embodiment includes a linear modulator 11, a high power amplifier 12 for power amplifying a transmission signal output from the linear modulator 11, a power amplifier 12 for generating power supplied to the high power amplifier 12, The amplitude modulation section 13.

[0095] The linear modulator 11 includes: fixed clock input DA converters (DACs) 14 and 15 for performing digital-to-analog conversion based on an operation clock of a fixed frequency; low-pass filters (LPF) 16 and 17; quadrature modulators (MOD ) 18 for performing quadrature modulation on the output of the low-pass filters 16 and 17 at the output frequency of the local oscillator 20 and performing frequency conversion to the RF band; and a medium power amplifier 19 for amplifying the quadrature modulato...

no. 2 example

[0117] Figure 5 is a block diagram showing the configuration of a transmitter according to the second embodiment of the present invention. In part configuration, the transmission section 40 of the second embodiment is different from that of the first embodiment; the configuration of the amplitude modulation section is changed, the clock switching terminal 36 is provided, and it is made possible to change the operation clock by changing the DA converter Control the operating current.

[0118]The amplitude modulation section 41 includes a variable clock input DA converter (DAC) 42 that can change the operating clock according to a switching signal from the clock switching terminal 36 in the transmission output control signal input section. Other components are similar to those in the first embodiment, and the same reference numerals are used to designate similar components, and will not be discussed here.

[0119] The variable clock input DA converter 42 with operation clock ...

no. 3 example

[0123] Image 6 is a block diagram showing the configuration of a transmitter according to a third embodiment of the present invention. The transmission section 50 of the third embodiment is different from that of the second embodiment in partial configuration; the configuration of the amplitude modulation section is changed, the current switching terminal 37 is provided, and the operating current of the high-speed operational amplifier of the power supply driver can be controlled .

[0124] The amplitude modulation section 51 has a power driver 53 including a high-speed operational amplifier (OPAMP) 52 that can change an operating current according to a switching signal from a current switching terminal 37 in the input section. The other components are similar to those in the first and second embodiments, and the same reference numerals are used to designate similar components, and will not be discussed here.

[0125] The high-speed operational amplifier 52 having an operat...

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PUM

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Abstract

A transmitter apparatus that exhibits a high efficiency and that can provide a wide variable output control width. An operation of saturation mode is performed in the vicinity of the maximum transmission power. A large-power amplifier(12) is caused, by increasing and then fixing the input level thereof, to operate in a saturation state, while the amplitude component of a modulation signal in a range corresponding to an output power control level is inputted to an R-input terminal(33) to amplitude modulate the power supply voltage(VDD) of a power supply terminal(25), thereby performing a polar coordinate modulation of a high efficiency. An operation of linear mode is performed for a smaller transmission power. The large-power amplifier(12) is caused, by reducing the input level thereof, to perform a linear operation, while the power supply voltage(VDD) of the power supply terminal(25) is varied in accordance with the output power control level, thereby performing a transmission power control.

Description

technical field [0001] The present invention relates to a transmitter whose output can be variably controlled and a wireless communication device using the transmitter. Background technique [0002] For a transmitter whose output can be variably controlled, power efficiency and linearity in the transfer function are evaluated as indicators of device performance. Power efficiency and linearity in the transfer function are the most important indicators representing the performance of devices, especially in high-frequency modulation transmitting machines such as mobile phones. [0003] A class A operational amplifier is widely used as an amplifier of the final stage of such a high-frequency modulation transmission machine. Class A amplifiers have little distortion, ie good linearity, but offer little power efficiency because they always consume power with a DC bias component. [0004] Then, the following method is devised as a method of operating a power amplifier with high e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/04H03F3/24H03F3/189H04L27/36
Inventor 齐藤典昭田中宏一郎田边充
Owner PANASONIC CORP
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