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參數(shù)資料
| 型號： | HPMX-7201 |
| 英文描述： | Upconverter(上變頻器) |
| 中文描述： | 變頻器（上變頻器） |
| 文件頁數(shù)： | 16/19頁 |
| 文件大?。?/td> | 163K |
| 代理商： | HPMX-7201 |
16
Pout (dBm)
I
-40
20
140
120
100
80
60
40
-20
-30
0
10
-10
Current consumption at
ACPR = -55 dBc/30 KHz
Continuous
<3 state
>2 state
Figure 36: HPMX-7201 Total Current
Consumption vs. Output Power and
Control Method.
Figure 37 shows the statistical-
average current consumption of
the upconverter/driver RFICs
versus the required maximum
output power out of the device.
The data is generated by integrat-
ing the curves in Figure 36 over
the complete output power range
of the mobile under the suburban
user model. The suburban model
gives a higher statistical-average
current than the urban model due
to the probability distribution tail
at high powers. The choice of
maximum output power is
determined by the gain of the
power amplifier, and the loss of
the filters, duplexers etc. that
follow the upconverter driver
amplifier.
Poutmax (dBm)
I
μ
90
85
80
75
70
65
60
55
50
2
14
6
4
10
12
8
Statistical-average current
Suburban model at
ACPR = -55 dBc/30 KHz
Continuous
<3 state
>2 state
Figure 37: HPMX-7201 Statistical-
Average Current Consumption vs.
Desired Maximum Output Power.
Figure 36 and Figure 37 illustrate
the significant advantage of using
adaptive-bias techniques in
CDMA mobile phones. The
HPMX-7201 has a total current
consumption (upconverter +
driver) of 130 mA when delivering
+14 dBm of output power with an
ACPR = -55 dBc/30 KHz. How-
ever, as summarized in Table 3,
the statistical-average current
consumption can be as low as
70 mA, if the phone can perform a
continuous control of the RF
VGA. The statistical average
current consumption is still a low
85 mA, even if an extremely
simple 2-state gain control
adjustment is used. Even with a
simple 2 state control algorithm,
the average supply current is still
significantly below the peak
current of 130 mA at maximum
power.
Table 3:
Statistical Average Supply
Current, Pout max = 14 dBm
Control Method Average Supply
Current
70 mA
80 mA
87 mA
Analog (N states)
3 State
2 State
Clearly, relatively low statistical-
average current consumption can
be achieved in the transmit RF
section of the mobile if adaptive-
bias techniques are used. Use of
adaptive bias techniques at lower
output powers combined with the
HPMX-7201’s excellent linearity
at high output powers provides
manufacturing margin for linear-
ity while also maintaining ex-
tended talk time.
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