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參數(shù)資料
型號： AFE7222EVM
廠商： Texas Instruments
文件頁數(shù)： 77/106頁
文件大小： 0K
描述： EVAL MODULE FOR AFE7222
標(biāo)準(zhǔn)包裝： 1
主要目的： 接口，模擬前端（AFE）
嵌入式： 否
已用 IC / 零件： AFE7222
已供物品： 板
其它名稱： 296-30300
AFE7222EVM-ND
COARSE_PWR_OP_I (3:0)
COARSE_PWR_OP_Q (3:0)
PWR_METER_COARSE_SAMPLES(2:0)
a
*a
+
b
*b
a
b
A
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e
P
o
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e
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in
d
B
s
c
a
le
a
*a
+
b
*b
a
b
A
v
e
ra
g
e
P
o
w
e
r
in
d
B
s
c
a
le
I
Q
0
Power Meter 1
Power Meter 2
Complex mode
0
SLOS711B – NOVEMBER 2011 – REVISED MARCH 2012
MIXING MODE
MIXING
MIXING PATTERN(1)
Iout = { +A, +A , +A, +A }
00
Normal (Low Pass, No Mixing)
Qout = { +B, +B , +B, +B }
Iout = { +A, –A , +A, –A }
01
High Pass (Fs/2)
Qout = { +B, –B , +B, –B }
Iout = { +A, –B , –A, +B }
10
+Fs/4
Qout = { +B, +A , –B, –A }
Iout = { +A, +B , –A, –B }
11
–Fs/4
Qout = { +B, –A , –B, +A }
(1)
A and B are the inputs to the CMIX block. Iout and Qout are the outputs.
9.7
RMS POWER METER
The RX signal chain has two power meters – the coarse power meter and fine power meter.
9.7.1
Coarse Power Meter
The fine power meter estimates the total integrated power in linear scale based on a much larger set of
samples. The resulting integrated power number is stored in a register for readout. The interval time (how
often to start integration) and integration time (number of samples to integrate) is programmable. The
power meter can be configured in either real mode (where the power of each channel is calculated
individually) or in a complex mode {where the power of (I^2+Q^2) is calculated}. This is illustrated below.
Figure 9-3. Coarse Power Meter
9.7.2
Fine Power Meter
The fine power meter estimates the total integrated power in linear scale based on a much larger set of
samples. The resulting integrated power number is stored in a register for readout. The interval time (how
often to start integration) and integration time (number of samples to integrate) is programmable. The
power meter can be configured in either real mode (where the power of each channel is calculated
individually) or in a complex mode {where the power of (I2+Q2)is calculated}. This is illustrated below.
72
APPLICATION INFORMATION
Copyright 2011–2012, Texas Instruments Incorporated
Product Folder Link(s): AFE7222 AFE7225
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