vco in general ... - GSM-Forum

Byte · 08-02-2006, 07:53

Hello all,

need professional advice to test VCO in general in nokia phones, since ordinary or basic test insrumnets does not test such a high frequency device more than 3 ghz , and also the hp 8922m ( up to 2 ghz ) test set also does not have the ability to test this device , is there is ny trick or method to test it ...?

does the control voltage enogh to verify the vco is working or not ...?

Byte · 08-04-2006, 17:53

pls help me to
solve this .....

Byte · 08-15-2006, 07:36

why no 1 can help ....?

7th_gear · 08-15-2006, 08:13

Check its voltage using plain multimeter, if steady 5 volts VCO not working,if no 5 volts No VCP (charge pump voltage)

VCO varies voltage depending on the channel monitoring

notice that our Vbatt is only 3.6V

UEM/CCONT produces step up 5V for voltage controlled oscillator for tuning in the bands desired.

Put unit in test mode if you want full swing frequency output

Byte · 08-15-2006, 09:31

Quote:

Originally Posted by shanchai

Check its voltage using plain multimeter, if steady 5 volts VCO not working,if no 5 volts No VCP (charge pump voltage)

VCO varies voltage depending on the channel monitoring

notice that our Vbatt is only 3.6V

UEM/CCONT produces step up 5V for voltage controlled oscillator for tuning in the bands desired.

Put unit in test mode if you want full swing frequency output

IF VOLTAGE IS BETWEEN 1.8 AND 2.6 , DOES IT MEAN THE VCO FREQUENCY OUTPUT GOOD ...?

7th_gear · 08-15-2006, 10:00

yup ! as long as the main supply is 5volts approximately, less supply, less frequency coverage also

08-02-2006, 07:53	#1 (permalink)
Byte Registered User Join Date: Sep 2003 Location: Palestine Age: 50 Posts: 1,951 Member: 39208 Status: Offline Thanks Meter: 152	vco in general ... Hello all, need professional advice to test VCO in general in nokia phones, since ordinary or basic test insrumnets does not test such a high frequency device more than 3 ghz , and also the hp 8922m ( up to 2 ghz ) test set also does not have the ability to test this device , is there is ny trick or method to test it ...? does the control voltage enogh to verify the vco is working or not ...?

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08-04-2006, 17:53	#2 (permalink)
Byte Registered User Join Date: Sep 2003 Location: Palestine Age: 50 Posts: 1,951 Member: 39208 Status: Offline Thanks Meter: 152	pls help me to solve this .....

08-15-2006, 07:36	#3 (permalink)
Byte Registered User Join Date: Sep 2003 Location: Palestine Age: 50 Posts: 1,951 Member: 39208 Status: Offline Thanks Meter: 152	why no 1 can help ....?

08-15-2006, 08:13	#4 (permalink)
7th_gear Freak Poster Join Date: Aug 2005 Location: Philippines Age: 52 Posts: 155 Member: 167822 Status: Offline Thanks Meter: 13	Check its voltage using plain multimeter, if steady 5 volts VCO not working,if no 5 volts No VCP (charge pump voltage) VCO varies voltage depending on the channel monitoring notice that our Vbatt is only 3.6V UEM/CCONT produces step up 5V for voltage controlled oscillator for tuning in the bands desired. Put unit in test mode if you want full swing frequency output

08-15-2006, 10:00	#6 (permalink)
7th_gear Freak Poster Join Date: Aug 2005 Location: Philippines Age: 52 Posts: 155 Member: 167822 Status: Offline Thanks Meter: 13	yup ! as long as the main supply is 5volts approximately, less supply, less frequency coverage also