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參數(shù)資料
| 型號： | TCM4400EGGM |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | GSM/DCS BASEBAND AND VOICE A/D AND D/A RF INTERFACE CIRCUIT |
| 中文描述： | 的GSM / DCS的基帶和語音的A / D和D / A射頻接口電路 |
| 文件頁數(shù)： | 27/64頁 |
| 文件大?。?/td> | 888K |
| 代理商： | TCM4400EGGM |
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TCM4400E
GSM/DCS BASEBAND AND VOICE A/D
AND D/A RF INTERFACE CIRCUIT
SLWS082A – JULY 1999 – REVISED MARCH 2000
27
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
baseband uplink path (continued)
Burst
Register
Din
270 kHz
Differential
Encoder
Gaussian
Filter
Integrator
Power
Register
Ramp-Up
Shaper
Cosine
Table
8-Bit
DAC
Low-Pass
Filter
Sine
Table
Low-Pass
Filter
fs = 16 x 270 kHz
8-Bit
DAC
Offset
Register
Offset
Register
BULIP
BULIN
BULQP
BULQN
To Power
Control DAC
Burst Timing
Control
Timing Interface
–
–
+
+
I/Q Gain Unbalance
Figure 7. Functional Structure of the Baseband Uplink Path
baseband downlink path
The baseband downlink path includes two identical circuits for processing the baseband I and Q components
generated by the RF circuits. The first stage of the downlink path is a continuous-time second-order antialiasing
filter (see Figure 8) that prevents aliasing due to sampling in the A/D converter. This filter also serves as an
adaptation stage (input impedance and common-mode level) between external-world and on-chip circuitry.
M
TYPICAL FREQUENCY RESPONSE OF THE
ANTIALIASING FILTER
10
0
–10
–20
–30
–40
–50
–60
–70
f – Frequency – Hz
102
103
104
105
106
107
Figure 8. Antialiasing Filter
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