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Wave detection circuit of IS 95 and EVDO in separating CDMA signals

A technology of IS95 and detection circuit, applied in the network using active components, electrical components, demodulation of modulated electromagnetic waves, etc., can solve the problems affecting IS95 measurement, etc., to achieve the effect of simple circuit, low implementation cost, and accurate detection

Inactive Publication Date: 2009-07-08
WUHAN GEWEI ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, a good waveform can be obtained for EVDO, but it affects the IS95 measurement

Method used

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  • Wave detection circuit of IS 95 and EVDO in separating CDMA signals
  • Wave detection circuit of IS 95 and EVDO in separating CDMA signals
  • Wave detection circuit of IS 95 and EVDO in separating CDMA signals

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Embodiment Construction

[0020] Such as Figure 4 , Figure 5 As shown, a detection circuit for distinguishing IS95 and EVDO in CDMA signals is mainly composed of CLPF detection tube, resistor R1, resistor R2, capacitor C1a, capacitor C1b, capacitor C2a, capacitor C2b, the first electronic switch, the first Composed of two electronic switches and a third electronic switch, the CLPF detector tube is AD8362, and AD8362 is a true RMS power detector produced by American AD Company. One end of the resistor R1 is connected to the VOUT and VSET pins of the detector tube AD8362, the other end of the resistor R1 is connected to one end of the resistor R2, and the other end of the resistor R2 is respectively connected to the A / D converter, one end of the capacitor C1a, and the third electronic switch One end of (U3A) is connected, the resistor R2 is connected in parallel with the second electronic switch (U3B), and the control signal input end of the second electronic switch is connected with the RB1 pin of th...

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Abstract

This invention relates to a single carrier power amplifier used in th base stations of the CDMA system including a detection circuit for differentiating IS95 and EVDO in CDMA signals including a CLPF detecting tube, resistor R, capacitors C1 and C2, in which, one end of R is connected with the pins of VOUT VSET of the CLPF detection tube, the other end is connected with an A / D converter and one end of C1, the other of which is connected to the negative of the supply, one end of C2 is connected with the pin of the CLPF detection tube and the other end of C2 is connected with the negative of the supply characterizing that C2 is composed of C2a and C2b, capacitor C2b is serial to a first electronic switch then parallel to capacitor C2a, the control signal pin of the first electronic switch is connected with RB2 pin of a single-chip processor PICI8F2420.

Description

technical field [0001] The invention relates to a detection circuit for distinguishing IS95 and EVDO in CDMA signals. Background technique [0002] At present, on the CDMA power amplifier, it is required to be compatible with IS95 (CDMA_IS95) and EVDO (1XEV_DO) signals. Through microstrip coupling at the output of the power amplifier, the Π attenuates to the detector for detection. Convert the radio frequency signal into an analog voltage signal (0-2.5V), and then convert it to A / D (single-chip microcomputer). After calculation by the single-chip microcomputer, the output power is reported to the host computer through the serial port RS232. At the same time, the reporting accuracy of IS95 and EVDO is required to be ±0.5dBm. At present, the detection circuit used in the CDMA power amplifier is as follows: figure 1 shown. [0003] The detection circuit improves the detection waveform by adjusting the R, C1 values ​​and C2 in the R and C filter circuits to adjust the cut-of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03D9/00H03F3/20H03H11/00H04B7/005
Inventor 孟庆南
Owner WUHAN GEWEI ELECTRONICS TECH