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參數(shù)資料
| 型號： | TQ5635 |
| 廠商： | TRIQUINT SEMICONDUCTOR INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | 3 V PCS LNA/Mixer Receiver IC |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PQCC16 |
| 封裝： | 3 X 3 MM, PLASTIC, QFN-16 |
| 文件頁數(shù)： | 12/25頁 |
| 文件大?。?/td> | 218K |
| 代理商： | TQ5635 |
TQ5635
Data Sheet
12
For additional information and latest specifications, see our website:
www.triquint.com
Pinout Description:
The TQ5635 is a complete front-end for a Korea high
band CDMA handset receiver. It combines a high IP3
low noise amplifier, a high intercept mixer, and an IF
amplifier.
The LNA uses an off-chip matching network which connects to
the input at pin 2. The amplifier was designed so that the
match for maximumgain also gives very low noise figure.
The LNA has a single high gain mode that typically provides
15-16dB of gain.
The LNA also provides several ways of setting gain and
intercept in the design phase. The LNA FET source is
brought out to Pins 15 and 16, where a small value of
inductance to ground can be added. The inductor can be
discrete or simply a small length of pc board trace. Several
dB of adjustment is possible. For most applications,
maximumgain will be desired. In that case, pins 15 and 16
should be connected to ground with multiple vias. A bias
resistor on pin 4 is used to set the LNA supply current. A
nomnal value of 2.7kohmis recommended.
The LNA output signal is at Pin 14. It is a 50 ohmline and can
be connected directly to a SAW image filter. The image filter
output connects to the mxer input at Pin 12. The mxer
receives its LO via a buffer which amplifies the signal fromPin
9. The buffer transistor drain comes out of Pin 10 where it
connects to an external LO tuning inductor.
GND
GND
RF In
GND
LNA
Bias
MXR In
IF Out
GIC
GND
LO
In
GGain
LNA Out
LO
Vdd
Vdd
LNA Vdd
Mixer
IF Amp
LO Buffer
1
active
bias
LNA
GGain
Bias
Figure 1. TQ5635 Block diagram
The IF signal fromthe mxer is fed to an amplifier. The IF
amplifier is an open drain type with output at Pin 7. An
external matching circuit is required to match the IF output to
a filter. The IF amplifier also has a GIC pin (Gain-Intercept-
Current). It is used to set the DC current and gain of the IF
stage.
Application Information:
Half IF Spur Rejection Considerations:
The TQ5635 has a single ended mxer so Half-IF spur
rejection is set by the image filter. Thus we do not
recommend using an IF that is less than 2.5 times the image
filter.
Grounding:
With good layout techniques there should not be any stability
problems. Poor circuit board design can result in a circuit that
oscillates. Good grounding is especially important for the
TQ5635 since it uses an outboard LO tuning inductor that
provides one more potential ground loop path. One could
use the evaluation board as an example of proper layout
techniques.
It is important to position the LO tuning, GIC, and IF matching
components as close to the chip as possible. If the
components are far enough away they and their
corresponding pc board traces can act as quarter wave
resonators in the 5-10Ghz region. If both the IF and the LO
paths to ground resonate at the same frequency, oscillation
can result.
It is most important that the ground on the GIC bypass cap,
the ground on the LO tuning bypass capacitor, and the IF
shunt cap ground return back to the chip grounds with mnimal
inductance (Figure 2).
Also, improving the ground at the LO tuning inductor bypass
cap will increase circuit Q. Thus mxer drive is improved with
a resultant higher IP3. Improved ground here means mnimal
inductance between the chip ground pins and the other
ground return points. Although it is not a stability issue,
proper grounding of pins 15 and 16 is necessary for maximum
LNA gain. Multiple vias to ground should be placed very close
to those pins.
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