參數(shù)資料
型號(hào)： P11976EJ2V0AN00
英文描述： uPC2711-15. uPC2745-49. uPC2791/92. uPC3210 6-Pin Mini-Mold. 6-Pin Super Mini-Mold Silicon High-Frequency Wideband Amplifier MMIC
中文描述： uPC2711 - 15。 uPC2745 - 49。 uPC2791/92。 uPC3210 6引腳小型模具。 6引腳超小型模具硅高頻寬帶放大器單片
文件頁(yè)數(shù)： 12/31頁(yè)
文件大?。?/td> 174K
代理商： P11976EJ2V0AN00
Application Note P11976EJ2V0AN00
12
3.2 Description of External Circuits
Since all of the devices in this product line-up have on-chip 50-
matching circuits and bias circuits, you should
only externally attach a DC cut capacitor to input/output pins and a bypass capacitor to the V
CC
pin to configure
amplifier circuit. The bias should be applied only to the V
CC
pin.
As is indicated by the “S
21
” S parameter, the IC itself can operate across a wide band from DC to 3 dB down
bandwidth. However, the lower frequency may be limited depending on the DC cut capacitance to the input/output
pins, so the capacitance should be calculated using the following formula. The power gain shown in the data sheet’s
list of electrical characteristics is value without the effect of the DC cut capacitor or indicates the S
21
value which its
capacitance value (C) hardly affects the measured frequency.
1
C =
2
π
Z
f
C
You should check the frequency-related gain values for larger C values when using a low frequency and for
smaller C values when using a high frequency. Also, externally adjusting the pin voltage such as by applying voltage
to the input/output pins or by using direct pull-down is prohibited, since it causes the bias point to stray from the
designed value. Any RF components should be attached to the external side of DC cut capacitor.
The power supply impedance is determined by factors such as the bypass capacitor value and insertion point. In
view of the bandwidth of this IC’s, the bypass capacitor value should be 1000pF in the test circuit. In addition to the
bypass capacitor value, the factors that affect the power supply impedance (to the V
CC
pin) and the (GND pins’)
ground impedance include the V
CC
line length (which in turn is affected by the mount position) and mounting patterns
such as the ground pattern. This RF grounding capacitor can decrease the frequency-band-impedance
corresponding to the capacitance value, which prevents the intrusion or occurrence of power supply noise at the V
CC
pin. As mentioned above, 1000 pF is considered a suitable bypass capacitance value for the V
CC
line. However, you
should note that Vcc line inductance grows and its impedance rises unless the bypassed ground pattern is widened
or a through hole is used to link the pattern.
Although there are three GND pins, a ground pattern should be connected together and grounding unified so as to
avoid any impedance differences among the pins that might generate oscillation.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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P-11A 制造商:Triad Magnetics 功能描述:
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