Intersil HWB3163 Скачать руководство пользователя страница 6

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FIGURE 3. WIRELESS LAN PC CARD TEST POINTS (BOTTOM VIEW)

Test Point Diagrams

(Continued)

INSTALL FOR RF CONNECTOR

TEST POINT B

TEST POINT A

TEST POINT D - TX IF SIGNAL (AFTER SAW FL)

TEST POINT

TEST POINT C

REMOVE FOR RF CONNECTOR

TEST POINT H
IF L.O.

TEST POINT F - RF L.O.

TEST POINT G
RF L.O. LOCK VOLTAGE

C141 (150 PF)

TEST POINT I
IF L.O. LOCK VOLTAGE

RF IN/OUT

TEST POINT E

TX Q+

TX I+

TX IF SIGNAL (BEFORE SAW FL)

L4 (1.5 NH)

INSTALL FOR RF CONNECTOR
C137 (150 PF)
ALSO INSTALL C141 (SEE BELOW)

ALSO INSTALL C137 (SEE ABOVE)

TEST POINT A1
TX I-

TEST POINT B1
TX Q-

(INSTALL J1 FOR
RF CONNECTOR)

J- RX IF+ SIGNAL

Application Note 9864

Содержание HWB3163

Страница 1: ... Sense Multiple Access with Collision Avoidance CSMA CA protocol Using this protocol each station senses the communications medium RF channel and does not transmit until the channel is clear This avoids collisions and minimizes the retransmission of subsequent packets The standard also supports the operation of a station within a wireless LAN that may coexist with several overlapping wireless LANs...

Страница 2: ...s the achievable data rate A frequency hopping occupied bandwidth of 1MHz as specified by the FCC acts as a limitation when using data rates beyond 2Mbps A similar bandwidth limitation has not been imposed when using the direct sequence implementation In the new 802 11 high data rate 11Mbps standard utilizing Complementary Code Keying CCK modulation the 5 1 2 times increase in data rate has been a...

Страница 3: ...s Ad Hoc link between two computers The NDC Driver may be easily accessed by double clicking on its icon looks like a computer with an antenna on top located in the System Tray area on the desktop List of Test Instruments The following instruments may be used for conducting tests on the wireless LAN PC card Step 1 Ensure that power to the PCMCIA slot is OFF by noting that the PCMCIA icon does not ...

Страница 4: ...L HFA3783 FILE 4633 IF I Q MOD DEMOD RF LO PLL HFA3683A RF IF CONVERTER HFA3983 PA REF_OUT CONTROL TEST I O HFA3841 MAC FILE 4661 HOST PC INTERFACE MEMORY ACCESS ARBITER HOST INTERFACE LOGIC RADIO DATA INTERFACE RADIO CONTROL PORTS GP SERIAL PORTS WEP ENGINE CPU 16 BIT PIPELINED CONTROL PROCESSOR EXTERNAL MEMORY FILE 4635 FILE 4634 FILE 4816 VCO VCO OSC BUFFER VCTRL VCTRL 44MHz Application Note 98...

Страница 5: ...5 Test Point Diagrams FIGURE 2 WIRELESS LAN PC CARD TEST POINTS TOP VIEW TEST POINT K RX I SIGNAL TEST POINT L RX Q SIGNAL TEST POINT K1 RX I SIGNAL TEST POINT L1 RX Q SIGNAL Application Note 9864 ...

Страница 6: ...OVE FOR RF CONNECTOR TEST POINT H IF L O TEST POINT F RF L O TEST POINT G RF L O LOCK VOLTAGE C141 150 PF TEST POINT I IF L O LOCK VOLTAGE RF IN OUT TEST POINT E TX Q TX I TX IF SIGNAL BEFORE SAW FL L4 1 5 NH INSTALL FOR RF CONNECTOR C137 150 PF ALSO INSTALL C141 SEE BELOW ALSO INSTALL C137 SEE ABOVE TEST POINT A1 TX I TEST POINT B1 TX Q INSTALL J1 FOR RF CONNECTOR J RX IF SIGNAL Application Note ...

Страница 7: ...al The I and Q are both differential signals and as such consist of I I Q and Q respectively As these are balanced signals data is measured using a Tektronix P6247 Differential Probe For example in the measurement of the I signal the probe is bridged between Test Points A I and A1 I Transmit In phase and Quadrature I and Q signals are the spread baseband single bit I and Q digital data that are ou...

Страница 8: ...at test point F is approximately 6dBm Ideally the tuning voltage of the VCO when locked falls between 0 5V and 2 2V The tuning voltage of the RF VCO can be observed at Test Point G Test Points H and I IF local oscillator LO The IF VCO is a discrete design and operates at 748MHz i e twice the IF frequency The output frequency of this VCO does not need to be varied thus minimal tuning range is requi...

Страница 9: ...ed for the plots in this figure as such I and Q are inverse of each other The receive In phase and Quadrature I and Q signals are the demodulated lowpass filtered data that are coupled to the HFA3861 The output levels of these two signals are approximately 500mVP P As these are balanced signals data is taken using a Tektronix P6247 Differential Probe Test point K for RXI signal is at the 0Ω jumper...

Страница 10: ...eption which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and the receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or a...

Страница 11: ...ubsidiaries for its use nor for any infringements of patents or other rights of third parties which may result from its use No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries For information regarding Intersil Corporation and its products see web site www intersil com Sales Office Headquarters NORTH AMERICA Intersil Corporation P O B...

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