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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)： | 16/22頁 |
| 文件大?。?/td> | 261K |
| 代理商： | TQ5135 |
TQ5135
Data Sheet
16
For additional information and latest specifications, see our website:
www.triquint.com
LO IN
VDD
NETWORK
ANALYZER
PORT 1
MEASURE S21
COAXIAL
PROBE
TQ5135
G
GND
RF In
GND
LNA
Bias
MXR
In
I
I
GND
LO
In
G
L
V
DD
V
D
V
D
Figure 15: LO Tuning Test Setup
4. GIC Network Design
The GIC pin on the TQ5135 is connected internally to the
source of the IF output stage. By adding one or two resistors
and a capacitor to this pin, it is possible to vary both the IF
stage AC gain, and the IF stage quiescent current. However,
there is a limt to the amount of gain increase that is possible,
since there is always some package and bond wire
inductance back to the die. Furthermore, although some
additional IP3 performance may be gained by increasing the
quiescent current, in practice it makes no sense to increase
Idd beyond that which provides maximuminput intercept. At
some point IP3 is limted by the mxer FET, and no further
increase in input intercept can be obtained by adjusting the IF
stage.
There are two GIC schemes that are recommended for the
TQ5135 (Figure 16). The first uses a small resistor (1.0 to 5
ohms) in series with a bypass capacitor to set the AC gain.
The IF stage current is then set by the larger resistor (40 to 80
ohms) that connects directly fromthe GIC pin to ground. The
small degeneration resistor lowers the IF stage gain.
The second scheme, which is recommended for maximum
gain, uses a resistor in parallel with capacitor. The resistor
sets the DC current, while the capacitor bypasses it at the IF
frequency. For highest gain, place the capacitor as close to
Pin 7 as possible. Try to avoid capacitors which are self-
resonant at the IF frequency.
Here is an approximate equation for Rgic as a function of IF
stage Idd: Rgic ~ 0.6 / IDD_IF
GIC PIN
GIC PIN
Chip
GND
Chip
GND
0 to 5 ohms
40 to 80 ohms
40 to 80 ohms
sets IF
current
Zc bypass
at IF Freq
Zc bypass
at IF Freq
AC degen
sets IF
current
Figure 16: GIC Pin Networks
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