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BK4819 Fiches technique(PDF) 3 Page - Beken Corporation

No de pièce BK4819
Description  Analog Two Way Radio IC
Download  22 Pages
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Fabricant  BEKEN [Beken Corporation]
Site Internet  http://www.bekencorp.com/en
Logo BEKEN - Beken Corporation

BK4819 Fiches technique(HTML) 3 Page - Beken Corporation

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BK4819
Proprietary and Confidential
Page 3 of 22
channel filtering, a variable gain amplifier (VGA) and a high precision analog-to-
digital converter(ADC). The block diagram of the FM receiver is shown in Figure
2.
At the RF front-end part, the LNA is a differential low-noise amplifier with single-
ended input. The LNA is followed by a quadrature mixer that down-converts the
RF signal directly to IF signal. Low-IF image rejection architecture is
implemented in order to eliminate the external SAW filters.
At the IF part, the down-converted in-phase IF signal (IF/I) and quadrature-phase
IF signal(IF/Q)are first filtered by the BPF, and then amplified by the VGA.The
Sigma-Delta ADC sample analog IF signal from VGA, and convert it to digital IF
signal. Then the digital signal will be send to DSP for second down-conversion
and audio processing.
To avoid serious distortion with high-level input power, AGC function is added to
automatically adjust the gain of LNA and the gain of VGA.
LF
DIV
CP
PFD
Frac-N
-
Mod
Reference Clock
from OSC
Ramping
IF/I
IF/Q
Rfin
Rfout
LNA
Mixer
Filter + VGA + ADC
Buffer + PA Driver
VCO
FM Receiver
FM Transmitter
RF Frequency Synthesizer
Do/I
Do/Q
Figure 2. Radio Block Diagram
1.2.2 FM Transmitter
The transmitter is a single-ended amplifier including a buffer and a PA driver. The
block diagram of the transmitter is shown in Figure 2. Due to FM modulation is of
constant envelope, the amplifier works in saturated mode to save current
consumption.
The output power of FM transmitter can be programmed from -24dBm to +7dBm
through 3-wire SPI interface.
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