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Emission-circuit and communication terminal apparatus with said circuit

A technology of transmitting circuit, circuit, applied in transmitter/receiver shaping network, radio/inductive link selection arrangement, electrical components, etc., can solve the problems of cost and size inappropriate

Inactive Publication Date: 2002-10-23
NEC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the structure is not suitable from the point of view of cost and size

Method used

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  • Emission-circuit and communication terminal apparatus with said circuit
  • Emission-circuit and communication terminal apparatus with said circuit
  • Emission-circuit and communication terminal apparatus with said circuit

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0014] Description of preferred embodiments

[0015] Embodiments of the present invention will be described next with reference to the drawings.

[0016] image 3 A block diagram of the internal circuit structure of the GSM (Global Digital System for Mobile Communications) 900 / DCS (Digital Cellular System) 1800 dual-band power amplifier according to the present invention is given. According to an embodiment of the present invention, the GSM 900 and DCS 1800 frequency bands represent a frequency band around 900 MHz and a frequency band around 1800 MHz, respectively.

[0017] The transmission circuit according to the embodiment includes a first-stage amplifier 1 , a second-stage amplifier 2 , a low-pass filter 3 , a high-pass filter 4 , a GSM 900 band amplifier 5 , a DCS 1800 band amplifier 6 and a bias voltage setting circuit 7 . The transmitting circuit amplifies the signal input to the first-stage amplifier 1 and outputs the amplified signal. The first-stage amplifier 1 and...

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PUM

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Abstract

When transmitting the GSM 900 band signal, the bias setting circuit sets the optimal bias voltage of the GSM 900 band to the first-stage amplifier and the second-stage amplifier. The transmitted signal is amplified by two amplifiers. The signal output from the second stage amplifier is sent to a low pass filter. A low-pass filter attenuates unwanted radiation waves from the transmitted signal. The GSM 900 band amplifier amplifies the output signal of the low-pass filter and outputs the amplified signal. When transmitting a signal in the DCS 1800 band, the bias setting circuit sets the optimal bias voltage of the DCS 1800 band to the first-stage amplifier and the second-stage amplifier. The DCS 1800 band amplifier amplifies the output signal of the second stage filter and outputs the amplified signal.

Description

technical field [0001] The present invention relates to a transmitting circuit used in the form of mobile communication terminal equipment, in particular to a transmitting circuit using multiple transmitting frequency bands. Background of the invention [0002] In mobile communication technology, as the number of terminal devices in use increases at an explosive rate, communication traffic also increases dramatically. Therefore, there are systems with multiple frequency bands far apart. Also, in order to improve user convenience, there is a market demand that one terminal device can use a plurality of systems. [0003] In such a background, it is preferable to use a part of the circuits for a plurality of remote frequency bands rather than install all of them, generally from the standpoint of cost and mounting area. This is clear as the market demand for end equipment tends to be smaller. [0004] Figures 1 and 2 show examples of the structure of conventional transmit pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04B1/04H04B1/40
CPCH04B1/005H04B1/006H04B1/406
Inventor 石井克浩
Owner NEC CORP
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