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Electronic circuit arrangement generating transmit frequency

An electronic circuit and emission frequency technology, applied in the field of electronic circuit devices, can solve the problems of bad phase noise, multi-chip area, unsuitable for high integration density, etc., and achieve the effect of small phase noise

Inactive Publication Date: 2004-04-28
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Because a total of two oscillators for frequency stabilization, two PLL adjustment loops including two external loop filters are required in the known transmit frequency mixing scheme, and especially the low frequency oscillator requires a lot of chip area or has poorer characteristics in terms of phase noise, so this transmit mixing scheme proves to be less suitable for high integration densities

Method used

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  • Electronic circuit arrangement generating transmit frequency
  • Electronic circuit arrangement generating transmit frequency
  • Electronic circuit arrangement generating transmit frequency

Examples

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Embodiment Construction

[0037] figure 1 A known circuit arrangement for a TDMA radio system is shown, which has an oscillator 2 and a PLL circuit 1 for generating a frequency that is as stable as possible, a TDMA control unit 3 for a transmit amplifier 4 and an antenna 5 .

[0038]In such a circuit arrangement, at the instant when the transmit amplifier 4 is switched on, the frequency generation can be disturbed by load changes and / or reactions—as indicated by arrows 6 and 7—and result in undesired frequency jumps. When the transmit amplifier 4 is switched on, load changes occur due to changes in its input impedance.

[0039] The reaction to the frequency generation is caused by the radiation of the antenna 5 or by a further coupling circuit, not shown here, between the transmission output stage and the frequency generation. Supply voltage feed-in lines represent such an example.

[0040] figure 2 A known circuit for avoiding frequency hopping is shown. remove figure 1 In addition to the compon...

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Abstract

The invention relates to an electronic circuit arrangement which is used to generate a transmit frequency for a transceiver, comprising a controllable oscillator (2) which generates an oscillator frequency (fosz), a divider (19) by a factor of (N) and a mixer stage (32) with a subsequent band filter (33), whereby the oscillator frequency (fosz) and the oscillator frequency of the mixer stage (32) divided by the factor of (N) are provided in the form of input signals.

Description

technical field [0001] The invention relates to an electronic circuit arrangement for generating a transmission frequency for a transmitter / receiver. Background technique [0002] Similar circuit arrangements for generating corresponding transmission frequencies in TDMA radio systems (eg DECT, GSM, PHS) are known to the inventors in the prior art. The acronym for "Time Division Multiple Access" is TDMA. Such a device consists of a frequency-generating oscillator, a transmitting amplifier, a receiver and a control device, which determines the temporal sequence of the alternating transmitting and receiving states. As a rule, the oscillator frequency for adjusting the channel is adjusted with the control unit and by means of a PLL (Phase Modulation Loop) before switching on the transmitter, because, for technical reasons, this process requires some adjustment time . The present invention relates to the transmission situation in such a TDMA system, the arrangement of which is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/04H03B21/02H03L7/16H03L7/185
CPCH03L7/185H03L7/16H03B21/02H04B1/40
Inventor V·德特林格S·海宁
Owner SIEMENS AG
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