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參數(shù)資料
| 型號： | TQ5135 |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 17/22頁 |
| 文件大?。?/td> | 261K |
| 代理商： | TQ5135 |
TQ5135
Data Sheet
For additional information and latest specifications, see our website:
www.triquint.com
17
Figure 17: Mxer Performance as a Function of Rgic
5. IF Match Design
The Mxer IF output (Pin 7) is an "open-drain" configuration,
allowing for flexibility in efficient matching to various filter
types and at various IF frequencies. An optimumlumped-
element-matching network must be designed for maximum
TQ5135 conversion gain and mnimummatching network loss.
When designing the IF output matching circuit, one has to
consider the output impedance, which will vary somewhat
depending on the quiescent current and the LO drive. The IF
frequency can be tuned from45 to 400 MHz by varying
component values of the IF output matching circuit. The IF
output pin also provides the DC bias for the output FET.
In the user's application, the IF output is most commonly
connected to a narrow band SAW or crystal filter with
impedance from500 -1000
with 1 - 2 pF of capacitance. A
conjugate match to a higher filter impedance is generally less
sensitive than matching to 50
. When verifying or adjusting
the matching circuit on the prototype circuit board, the LO
drive should be injected at the nomnal power level (-4 dBm,
since the LO level does have an impact on the IF port
impedance.
There are several networks that can be used to properly
match the IF port to the SAW or crystal IF filter. The IF FET
bias is applied through the IF output Pin 7, so the matching
circuit topology must contain either a RF choke or shunt
inductor.
For purposes of 50 ohmevaluation, the shunt L, series C,
shunt C circuit shown in Figure 18 is the simplest and requires
the fewest components. DC current can be easily injected
through the shunt inductor and the series C provides a DC
block, if needed. The shunt C, in particular can be used to
improve the return loss and to reduce the LO leakage. The
circuit is used on our evaluation board.
For matching into a filter, the circuit of Figure 19 works well.
The network provides the needed impedance transformation
with a lower loaded Q using reasonable inductor values.
Thus matching circuit loss is mnimzed. The ratio between
(L1+L2) and L2 is proportional to the square root of the
impedances to be matched, Z1 and Z2. The sumof L1 and
L2 must be chosen so that the total inductance resonates with
the SAW input capacitance. If this resonant frequency is
much higher than the IF frequency, then Copt can be added to
lower it. Please note that because of parasitic capacitance
and the discrete values of commercial inductors, the formulas
of Figure 15 only serve as a starting point for experimentation.
In order to mnimze loss, any inductors used should have high
Q. Typically 0805 size inductors performbetter than the 0603
size. If 0603 inductors must be used for space
considerations, make certain to use High-Q types. It is
possible to introduce 3dB of additional loss by using low Q
inductors. Additionally, it is recommended to place the IF filter
very close to the TQ5135. If the two are far apart a
transmssion line will be needed between them In that case
two matching networks will be needed, one to match down to
50ohms and one to match back up to 1000ohms. Twice the
loss can be expected for such a scheme.
5135 Mixer
NF, Gain, IIP3 and Idd vs GIC resistor
5
6
7
8
9
10
11
12
13
33
39
47
56
68
82
GIC resistor (Ohms)
dB
4
5
6
7
8
9
10
11
12
Idd (mA)
NF
Gain
IIP3
Idd
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