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Bipath parent oscillation source device

A technology of source device and local oscillator circuit, which is applied in multiplexing communication, time-division multiplexing system, electrical components, etc., to achieve the effect of saving circuit cost, reducing difficulty, reducing leakage and radiation

Inactive Publication Date: 2004-10-20
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem in the prior art that the two-way local oscillators are isolated only by switches, and the signal radiation and crosstalk are serious under the condition of high transmission power, and propose a dual-way local oscillator source device with high isolation

Method used

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  • Bipath parent oscillation source device
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Embodiment Construction

[0011] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0012] figure 1 It is a principle diagram of the present invention. Such as figure 1 As shown, the dual-path local oscillator source quasi-device proposed by the present invention includes the same but mutually independent local oscillator circuit 1 and local oscillator circuit 2, and a single-pole double-throw radio frequency switch; the local oscillator circuit 1 and local oscillator circuit 2 output The local oscillator signal is output after being isolated and gated by the RF switch. The radio frequency SPDT switch plays the role of gating one of the two local oscillator signals. The first channel is selected when the control signal added to it is high level, and the second channel is selected when it is low level. The device also includes a power control circuit, the power control circuit is used to control when the power of the local...

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Abstract

The device includes two identical and independent local oscillating circuits 1 and 2, a single-pole double-throw radio frequency switch, and a power supply control circuit. Local oscillator signals from local oscillator circuits 1 and 2 are insulated, gated and output. The power supply control circuit turns power supply of local oscillator circuit 1 to on and power supply of local oscillator circuit 2 to off; as well as turns power supply of local oscillator circuit 1 to off and power supply of local oscillator circuit 2 to on. The invention manages power supply of amplifier and keeps synchronization with switch so as to reduce signal leaking and radiation effectively, raise isolation and purity of two Local oscillator signals etc.

Description

technical field [0001] The present invention relates to local oscillator circuits in transceivers of communication systems. Background technique [0002] In the transceiver circuit of the TDMA communication system, the local oscillator circuit is often required to provide high-quality local oscillator signals and fast frequency switching in different time slots. The single local oscillator source is between fast frequency switching and high-quality signals. There is a contradiction, while realizing fast frequency hopping in a limited guard time slot, it will inevitably bring a series of negative effects such as the decrease of modulation accuracy, the deterioration of receiving sensitivity, the increase of spurs, and the decrease of blocking performance. At present, the existing technology usually adopts the way of switching two-way local oscillator sources to provide fast carrier frequency points, and uses the combination switch to control the signal selection between the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/06H04J3/00
Inventor 杨剑尹成刚余敏德
Owner ZTE CORP
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