(No.RA053<Rev.001>)1-15
2.3.3 Receiver System
2.3.3.1
RF circuit
The receive signal from ANT SW (D201, D202, D203 and D205 (D205 is the NX3220 only.)) passes through the high-pass filter (L302,
L307, L308, L312, L313, L314 and L315) to remove unwanted signals and amplified by a RF amplifier (incorporated in IC303). The
signal is then fed to the mixer (incorporated in IC303) and converted to the baseband signal.
2.3.3.2
Baseband circuit
The baseband signal is then be fed into an ADC (incorporated in IC303), generates the I and Q data. This data is in the form of Serial
Interface, and sent to the MPU/DSP (IC401).
Fig.2 RF and Baseband circuit
2.3.3.3
Audio amplifier circuit
Audio processing (high-pass filter, low-pass filter, de-emphasized and so on) at Analog FM mode and decoding at Digital mode are
processed by DSP. I2S signal from DSP is converted to audio signal at IC601. The signal goes to internal speaker through the internal
Class-D amplifier or Jack connector for external speaker through the single-end audio power amplifier (IC650).
Audio path inside the Codec IC is controlled by I2C.
Fig.3 Audio amplifier circuit
ANT
ANT
LPF SW
D201
D202
D203
D205
ANT
L302
L307
L308
HPF
IC303
L312, L313
L314, L315
HPF
RFAMP
MIXER
PLL
VCO
ADC
Serial
I/F
IC401
MPU/DSP
LC
SE
IC65
I/F
IC303
Transceiver IC
Serial
IC401
MPU/DSP
DSP
IC601
CODEC
DA
I2C
I2S
Class D
FIlter
External Speaker
Internal Speaker
Содержание NX-3220 E
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