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Details, datasheet, quote on part number:WBCDMA
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Datasheet text preview:
APPLICATION INFORMATION
Demoboard W-CDMA for the BGA2003
Application Note
Philips Semiconductors
Application information
Demoboard W-CDMA for the BGA2003
Application Note
1
SUMMARY
· Description of products Monolithic Microwave Integrated Circuit (MMIC): RF transistor with internal bias circuit. The benefit is lower component count, low production spread and enabling function by Ictrl with high isolation when shutoff. · Application Area Low noise amplifier for systems like GSM, DECT, DCS with low component count. · Presented Application The application presents a low noise amplifier for W-CDMA at 3400 MHz with matching components. · Main results An amplifier has been designed and tested for application in W-CDMA with minimum component count: Frequency is 3 400 MHz; Isupply = 4.7 mA; Gain = 9.4 dB; IIP3 = 2.1 dBm; Noise Figure (NF) = 2.7 dB; VSWRin = 1.4; VSWRout = 1.6 Frequency is 3 400 MHz; Isupply = 10 mA; Gain = 10.3 dB; IIP3 = 9.2 dBm; Noise Figure = 3.1 dB; VSWRin = 1.2; VSWRout = 1.6.
1999 Feb 16
2
Philips Semiconductors
Application information
Demoboard W-CDMA for the BGA2003
2 THE INTERNAL BGA2003 CIRCUIT
Application Note
For understanding of the behaviour of the BGA2003 MMIC circuit the internal circuit diagram is given in Fig.1.
handbooCthalfpage k, rl
Vp-Out Rb In C1 Rc Ra Q4 C2 GND
MGR918
Q5
Fig.1 Internal circuit diagram.
Q5 is the main RF transistor. Q4 forms a current mirror with Q5. The input current of this current mirror is determined by the current into pin Ctrl. Rb limits the current when a control voltage is applied directly to the Ctrl input. Rc, C1, and C2 decouple the bias circuit from the RF input signal. 3 SIMULATION OF THE BGA2003 DEMOBOARD
S-parameters of the BGA2003 MMIC were measured at Vp-Out = 2.5 V, Isupply = 4 mA up to 3 GHz. HP-MDS simulation was used to extrapolate to 3.4 GHz and optimize component values for gain, noise and matching. These component values have been used as a starting point for finding the used practical component values (see Table 1).
1999 Feb 16
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