UPC1678 NEC, UPC1678 Datasheet - Page 5

• Manufacturer Part Number: UPC1678
• Description: 5 V-BIAS/ +7.5 dBm OUTPUT/ 2.0 GHz WIDEBAND Si MMIC AMPLIFIER
• Manufacturer: NEC

TEST CIRCUIT
INDUCTOR FOR THE OUTPUT PIN
transistor, connect an inductor between the V
voltage drop to output enable high level. In terms of AC, the inductor make output-port impedance higher to get
enough gain. In this case, large inductance and Q is suitable.
CAPACITORS FOR THE V
for the input and output pins.
can be supplied against V
impedance. Their capacitance are therefore selected as lower impedance against a 50
perform as high pass filters, suppressing low frequencies to DC.
100 MHz operation, increase the value of coupling capacitor such as 10 000 pF. Because the coupling capacitors
are determined by equation, C = 1/(2 Rfc).
The internal output transistor of this IC consumes 30 mA, to output medium power. To supply current for output
The inductor has both DC and AC effects. In terms of DC, the inductor biases the output transistor with minimum
Capacitors of 1 800 pF are recommendable as the bypass capacitor for the V
The bypass capacitor connected to the V
The coupling capacitors, connected to the input and output pins, are used to cut the DC and minimize RF serial
To obtain a flat gain from 100 MHz upwards, 1 800 pF capacitors are used in the test circuit. In the case of under
IN
CC
50
CC
fluctuation.
, INPUT AND OUTPUT PINS
1 800 pF
1 800 pF
1
CC
CC
Data Sheet P11491EJ4V0DS00
pin is used to minimize ground impedance of V
pin (pin 8) and output pin (pin 5).
8
2, 3, 4, 6, 7
V
CC
5
L: 20.5 T, 2 mm I.D., 0.25 UEW
(about 300 nH)
L
1 800 pF
50
CC
pin and the coupling capacitors
OUT
load. The capacitors thus
CC
pin. So, stable bias
PC1678G
5