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TA0003 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - HBT Technology Adds Power to CDMA Chip Set - RF Micro Devices

भाग संख्या TA0003
समारोह HBT Technology Adds Power to CDMA Chip Set
मैन्युफैक्चरर्स RF Micro Devices 
लोगो RF Micro Devices लोगो 
पूर्व दर्शन
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TA0003 pdf
TA0003
Vcc
100 nF
1 nF
RF IN
1F2 OUT
FM IF
Filter
L2
C2
IF SELECT
IF 1 OUT
+
IF 1 OUT
-
CDMA IF Filter
V CC
C1
C1
100 nF
L1
1 nF
22 pF
1
2
3
4
5
6
7 SELECT
LOGIC
8
9
10
L1
22 pF
11 IF GAIN
ADJUST
12
24
23
22
21
1 nF
20
19
1 nF
18
17
16
15
1 nF
14
1 nF
13
RF IMAGE
FILTER, 50
LO BUFFER OUT
LO BUFFER ENABLE
LO
IN
GAIN ADJUST
(0.2 - 2.9 V)
10 k
Figure 2: The RF9906 integrates an LNA, mixer, two switched variable-gain IF ampli-
fiers, and a switched local-oscillator (LO) output buffer.
13
The RF9906’s double-balanced mixer is a series-con-
nected differential RF amplifier with a cross-coupled
active LO switch (Gilbert cell). Series feedback sets
the third-order intercept point. The mixer draws 9 mA
and features measured double-sideband noise figure
of 9 dB and an input third-order intercept point of +6
dBm. The 50 device can achieve an input third-order
intercept point of +10 dBm at +4.8 VDC with no
increase in noise figure. The mixer’s gain is reduced by
only 0.4 dB when the LO power is reduced to -9 dBm.
Two variable-gain IF amplifiers follow the mixer,
selected by logic-level signals. The gain-control circuit
uses a phase-cancellation technique. The mixer noise
figure and input third-order intercept point are affected
by less than 1 dB by the IF output selection at the nom-
inal gain setting. The mixer’s gain at the IF1 port is
13.5 ± 4.5 dB while gain at the IF2 port is 3.5 ± 4.5 dB.
Current drains for the IF1 and IF2 selections, including
bias and logic circuits, are 14 and 6 mA, respectively.
The switched LO output buffer provides 0-dB gain into
a 50 load over the LO input-power range of -6 to -3
dBm. The isolation to the LO port is 20 dB. The on/off
output ratio is also 20 dB. The buffer, with an AC-cou-
pled output port, is switched on with greater than 3.1 V
on pin 15. DC current drain is dependent upon the LO
13-26
drive, being 2.7 mA with -6-dBm LO power and 4.3 mA
with 0 dBm LO power.
The RF9908 upconverter IC is housed in an eight-pin
SOIC package. It contains a Gilbert-cell mixer with dif-
ferential IF inputs and differential LO ports (for single-
ended LO operation, one port is connected to an AC
ground). The mixer is followed by a Class B push-pull
output buffer amplifier. The IC operates at +3.6 VDC
with 0 dB conversion gain and +13 dBm output third-
order intercept point. The gain and intercept-point per-
formances are not affected by changing the LO level.
The mixer is made of a differential pair amplifier and a
four-quadrant multiplier. The lower differential part of
the mixer pair is the IF amplifier, which has emitter-
degeneration resistors to reduce the IF gain. By keep-
ing the IF level small and well below the LO level,
mixer linearity improves. The upper portion of the
mixer incorporates switching transistors. Large LO sig-
nals (ideally square waves) are applied to the bases of
the two cross-coupled transistors to alternately turn the

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शेयर लिंक


अनुशंसा डेटापत्रक

भाग संख्याविवरणविनिर्माण
TA0003HBT Technology Adds Power to CDMA Chip SetRF Micro Devices
RF Micro Devices


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