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UPC8001GR

IF AMPLIFIER IC WITH ON-CHIP MIXER FOR DIGITAL CELLULAR PHONES

NEC => Renesas Technology 

µPC8001

Figure 3-1. Mixer Input

(a) 50Ω Termination

(b) LC Matching

VMIX IN

0.01µ F

50Ω

14 MIX IN1

VMIX IN

Note

5 pF

0.01µ F

14 MIX IN1

Note

107 nH

Note The values L and C are affected by the parasitic capacitance and inductance of the board. Therefore,

adjust L and C so that the impedance at the MIX IN pin from the signal source equals 50Ω.

Remark The signal source impedance is 50Ω.

MIX IN1

14

0.01µ F

16.7 Ω

50 Ω

Figure 3-2. Third Order Intercept

MIX OUT

9

0.01µ F

1.5 kΩ

OSC IN

11

VOSC IN = –15 dBm

0.01µ F

50 Ω

Measure 455 kHz component

level with spectrum analyzer

fOSC IN = 129.545 MHz

16.7 Ω

16.7 Ω

f1

f2

f1 = 130.1 MHz, f2 = 130.2 MHz

6 dB/OCT

18 dB/OCT

f = 130 MHz

f1 = 130.1 MHz

f2 = 130.2 MHz

Remark Signal source impedance is 50Ω.

VMIX IN [dBm]

Third order intercept

11

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